Efficiency and stability of p-i-n type organic light emitting diodes for display and lighting applications

Proceedings of the IEEE

Volumn 97, Issue 9, 2009, Pages 1606-1626

  Meerheim, Rico ^a   Lüssem, Björn ^a   Leo, Karl ^a  

^a DRESDEN UNIVERSITY OF TECHNOLOGY   (Germany)

Author keywords

Controlled doping; High efficiency; Long term stability; Organic light emitting diodes; RGB and white OLEDs

Indexed keywords

DIODES; ENERGY EFFICIENCY;

CHARGE TRANSPORT LAYER; HIGH POWER EFFICIENCIES; HIGH-EFFICIENCY; LIGHTING APPLICATIONS; LONG TERM STABILITY; LOW OPERATING VOLTAGE; ORGANIC LIGHT EMITTING DIODES(OLEDS); WHITE OLEDS;

ORGANIC LIGHT EMITTING DIODES (OLED);

EID: 69449105837     PISSN: 00189219     EISSN: None     Source Type: Journal    
DOI: 10.1109/JPROC.2009.2022418     Document Type: Article

References (157)

1. C. W. Tang, "Two-layer organic photovoltaic cell," Appl. Phys. Lett., vol.48, p. 183, 1986.
2. C. Tang and S. VanSlyke, "Organic electroluminescent diodes," Appl. Phys. Lett., vol.51, p. 913, 1987.
3. J. Burroughes, D. Bradley, A. Brown, R. Marks, K. Mackey, R. Friend, P. Burn, and A. Holmes, "Light-emitting diodes based on conjugated polymers," Nature, vol.347, p. 539, 1990.
4. J. Bardsley, "International OLED technology roadmap," IEEE J. Select. Topics Quantum Electron., vol.10, p. 3, 2004.
5. P. Bertoldi and B. Atanasiu, "Electricity consumption and efficiency trends in the enlarged european union," in European Commission - Joint Research Centre, Institute for the Environment and Sustainability, vol.EUR 22753 EN, pp. ISSN 1018-5593: 2007.
6. M. Baldo, D. O'Brien, Y. You, S. Shoustikov, S. Sibley, M. Thompson, and S. Forrest, "Highly efficient phosphorescent emission from organic electroluminescent devices," Nature, vol.395, p. 151, 1998.
7. A. Brown, K. Pichler, N. Greenham, D. Bradley, R. Friend, and A. Holmes, "Optical spectroscopy of triplet excitons and charged excitations in poly(p-phenylenevinylene) light-emitting diodes," Chem. Phys. Lett., vol.210, p. 61, 1993.
8. D. Bradley, "Conjugated polymer electroluminescence," Synth. Met., vol.54, p. 401, 1993.
9. M. Baldo, D. O'Brien, M. Thompson, and S. Forrest, "Excitonic singlet-triplet ratio in a semiconducting organic thin film," Phys. Rev. B, vol.60, p. 14422, 1999.
10. M. Segal, M. Baldo, R. Holmes, S. Forrest, and Z. Soos, "Excitonic singlet-triplet ratios in molecular and polymeric organic materials," Phys. Rev. B, vol.68, p. 075211, 2003.
11. [11] C. Adachi, M. A. Baldo, M. E. Thompson, and S. R. Forrest, "Nearly 100% internal phosphorescence efficiency in an organic light emitting device," J. Appl. Phys., vol.90, p. 5048, 2001. (Pubitemid 33084561)
12. Y. Kawamura, K. Goushi, J. Brooks, J. J. Brown, H. Sasabe, and C. Adachi, "100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films," Appl. Phys. Lett., vol.86, p. 071104, 2005.
13. M. Baldo, M. Thompson, and S. Forrest, "Phosphorescent materials for application to organic light emitting devices," Pure Appl. Chem., vol.71, p. 2095, 1999.
14. [14] M. Lu and J. Sturm, "Optimization of external coupling and light emission in organic light-emitting devices: Modeling and experiment," J. Appl. Phys., vol.91, p. 595, 2002. (Pubitemid 34091003)
15. N. C. Greenham, R. H. Friend, and D. D. C. Bradley, "Angular dependence of the emission from a conjugated polymer light-emitting diode: Implications for efficiency calculations," Adv. Mater., vol.6, p. 491, 1994.
16. B. Saleh and M. Teich, Fundamentals of Photonics, 2nd ed. New York: Wiley, 1991.
17. H. Bässler, "Charge transport in disordered organic photoconductors: A monte carlo simulation study," Phys. Stat. Sol. B, vol.175, p. 15, 1993.
18. V. Arkhipov and H. Bässler, "A model of weak-field quasi-equilibrium hopping transport in disordered materials," Phil Mag. Lett., vol.67, p. 343, 1993.
19. M. Pope and C. Swenberg, Electronic rocesses in Organic Crystals and Polymers, 2nd ed. New York: Oxford University Press, 1999.
20. M. Pfeiffer, S. Forrest, and R. Waser, Nanoeiectronics and Information Technology: Organic Light Emitting Diodes. Weinheim: Wiley-VCH, 2003.
21. M. Pfeiffer, K. Leo, X. Zhou, J. Huang, M. Hofmann, A. Werner, and J. Blochwitz-Nimoth, "Doped organic semiconductors: Physics and application in light emitting diodes," Org. Electron., vol.4, p. 89, 2003.
22. M. Pfeiffer, A. Beyer, B. Plönnigs, A. Nollau, T. Fritz, K. Leo, D. Schlettwein, S. Hiller, and D. Wöhrle, "Controlled p-doping of pigment layers by cosublimation: Basic mechanisms and implications for their use in organic photovoltaic cells," Solar Energy Mater. and Solar Cells, vol.63, p. 83, 2000.
23. J. Blochwitz, M. Pfeiffer, T. Fritz, and K. Leo, "Low voltage organic light emitting diodes featuring doped phthalocyanine as hole transport material," Appl. Phys. Lett., vol.73, p. 729, 1998.
24. W. Gao and A. Kahn, "Controlled p-doping of zinc phthalocyanine by coevaporation with tetrafluorotetracyanoquinodimethane: A direct and inverse photoemission study," Appl. Phys. Lett., vol.79, p. 4040, 2001.
25. K. Walzer, B. Maennig, M. Pfeiffer, and K. Leo, "Highly efficient organic devices based on electrically doped transport layers," Chem. Rev., vol.107, p. 1233, 2007.
26. M. Pfeiffer, "Controlled doping of organic vacuum deposited dye layers: Basics and applications," Ph.D. dissertation, TU Dresden, 1999.
27. J. Blochwitz, T. Fritz, M. Pfeiffer, K. Leo, D. M. Alloway, P. A. Lee, and N. R. Armstrong, "Interface electronic structure of organic semiconductors with controlled doping levels," Org. Electron., vol.2, p. 97, 2001.
28. A. Nollau, M. Pfeiffer, T. Fritz, and K. Leo, "Controlled n-type doping of a molecular organic semiconductor: Naphthalenetetracarboxylic dianhydride (NTCDA) doped with bis(ethylenedithio)-tetrahiafulvalene (BEDT-TTF)," J. Appl. Phys., vol.87, p. 4340, 2000.
29. K. Harada, A. G. Werner, M. Pfeiffer, C. J. Bloom, C. M. Elliott, and K. Leo, "Organic homojunction diodes with a high built-in potential: Interpretation of the current-voltage characteristics by a generalized einstein relation," Phys. Rev. Lett., vol.94, p. 036601, 2005.
30. T. Mori, H. Jujikawa, S. Tokito, and Y. Taga, "Electronic structure of 8-hydroxyquinoline aluminum/LiF/Al interface for organic electroluminescent device studied by ultraviolet photoelectron spectroscopy," Appl. Phys. Lett., vol.73, p. 2763, 1998.
31. J. Kido and T. Matsumoto, "Bright organic electroluminescent devices having a metal-doped electron-injecting layer," Appl. Phys. Lett., vol.73, p. 2866, 1998.
32. M. Pfeiffer, S. Forrest, K. Leo, and M. Thompson, " Electrophosphorescent p-i-n organic light-emitting devices for very-high-efficiency flat-panel displays," Adv. Mater., vol.14, p. 1633, 2002.
33. X. Zhou, J. Blochwitz, M. Pfeiffer, A. Nollau, T. Fritz, and K. Leo, "Enhanced hole injection into amorphous hole-transport layers of organic light-emitting diodes using controlled p-type doping," Adv. Fund. Mater., vol.11, p. 310, 2001.
34. D. Delbeke, R. Bockstaele, P. Bienstman, R. Baets, and H. Benisty, "High-efficiency semiconductor resonant-cavity light-emitting diodes: A review," IEEE J. Select. Topics Quantum Electron., vol.8, p. 189, 2002.
35. B. Ruhstaller, T. Beierlein, H. Riel, S. Karg, J. Scott, and W. Riess, "Simulating electronic and optical processes in multilayer organic light-emitting devices," IEEE J. Select. Topics Quantum Electron., vol.9, p. 723, 2003.
36. B. Ruhstaller, ETFOS. Feusisberg, Switzerland: Fluxim AG, 2007.
37. J. Leger, S. Carter, B. Ruhstaller, H. Nothofer, U. Scherf, H. Tillman, and H. Hörhold, "Thickness-dependent changes in the optical properties of PPV- and PF-based polymer light emitting diodes," Phys. Rev. B, vol.68, p. 054209, 2003.
38. X. Zhou, D. S. Qin, M. Pfeiffer, J. Blochwitz-Nimoth, A. Werner, J. Drechsel, B. Maennig, K. Leo, M. Bold, P. Erk, and H. Hartmann, "High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layers, " Appl. Phys. Lett., vol.81, p. 4070, 2002.
39. G. He, M. Pfeiffer, K. Leo, M. Hofmann, J. Birnstock, R. Pudzich, and J. Salbeck, "High-efficiency and low-voltage p-i-n electrophosphorescent organic light-emitting diodes with double-emission layers," Appl. Phys. Lett., vol.85, p. 3911, 2004.
40. J. Birnstock, A. Lux, M. Ammann, P. Wellmann, M. Hoffman, and T. Stübinger, "Novel materials and structures for highly-efficient, temperature-stable, and long-living AM OLED displays," in SID Int, Symp, Digest Tech. Papers, 2006, vol.37, p. 1866.
41. S. Okada, K. Okinaka, H. Iwawaki, M. Furugori, M. Hashimoto, T. Mukaide, J. Kamatani, S. Igawa, A. Tsuboyama, T. Takiguchi, and K. Ueno, "Substituent effects of iridium complexes for highly efficient red OLEDs," Dalton Trans., p. 1583, 2005.
42. D. Qin and Y. Tao, "Increased electrophosphorescent efficiency in organic light emitting diodes by using an exciton-collecting structure," J. Appl. Phys., vol.97, p. 044505, 2005.
43. J. Duan, P. Sun, and C. Cheng, "New iridium complexes as highly efficient orange-red emitters in organic light-emitting diodes," Adv. Mater., vol.15, p. 224, 2003.
44. J. Kim, E. Nam, S. Y. Hong, B. Kim, S. M. Kim, S. Yoon, J. Sun, Y. Ha, and Y. Kim, "Study on electrical characteristics of organic electrophosphorescent devices based on new ir complex," Mater. Sci., Eng, C, vol.24, p. 167, 2004.
45. R. Meerheim, K. Walzer, G. He, M. Pfeiffer, and K. Leo, "Highly efficient organic light emitting diodes (OLED) for displays and lighting," in Proc. SPIE, 2006, vol.6192, p. 22.
46. H. Becker, H. Vestweber, A. Gerhard, P. Stoessel, and R. Fortte, "Novel host materials for efficient and stable phosphorescent OLED devices," in SID Digest Tech. Pap., 2004, vol.XXXV, p. 17.5L.
47. J. Kavitha, S. Chang, Y. Chi, J. Yu, Y. Hu, P. Chou, S. Peng, G. Lee, Y. Tao, C. Chien, and A. Carty, "In search of high-performance Platinum(II) phosphorescent materials for the fabrication of red electroluminescent devices," Adv. Funct. Mater., vol.15, p. 223, 2005.
48. R. Meerheim, S. Scholz, S. Olthof, G. Schwartz, S. Reineke, K. Walzer, and K. Leo, "Influence of charge balance and exciton distribution on efficiency and lifetime of phosphorescent organic light-emitting devices," J. April Phys., vol.104, p. 014510, 2008.
49. S. Tokito, T. Iijima, Y. Suzuri, H. Kita, T. Tsuzuki, and F. Sato, "Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices," Appl. Phys. Lett., vol.83, p. 569, 2003.
50. P. Shih, C. Chiang, A. K. Dixit, C. Chen, M. Yuan, R. Lee, C. Chen, E. Diau, and C. Shu, "Novel carbazole/fluorene hybrids: Host materials for blue phosphorescent OLEDs," Org, Lett., vol.8, p. 2799, 2006.
51. D. Gebeyehu, K. Walzer, G. He, M. Pfeiffer, K. Leo, J. Brandt, A. Gerhard, P. Stößel, and H. Vestweber, "Highly efficient deep-blue organic light-emitting diodes with doped transport layers," Synth, Met, vol.148, p. 205, 2005.
52. K. Meerholz and D. Müller, "Outsmarting waveguide losses in thin-film light-emitting diodes," Adv, Funct., Mater., vol.11, p. 251, 2001.
53. K. Neyts, "Microcavity effects and the outcoupling of light in displays and lighting applications based on thin emitting films," Appl. Surf. Sci., vol.244, p. 517, 2005.
54. T. Yamasaki, K. Sumioka, and T. Tsutsui, "Organic light-emitting device with an ordered monolayer of silica microspheres as a scattering medium," Appl. Phys. Lett., vol.76, p. 1243, 2000.
55. Y. Sun and S. Forrest, "Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography," J. Appl. Phys., vol.100, p. 073106, 2006.
56. M. Agrawal, Y. Sun, S. Forrest, and P. Peumans, "Enhanced outcoupling from organic light-emitting diodes using aperiodic dielectric mirrors," Appl. Phys. Lett., vol.90, p. 241112, 2007.
57. H. Peng, X. Zhu, J. Sun, Z. Xie, S. Xie, M. Wong, and H. Kwok, "Efficient organic light-emitting diode using semitransparent silver as anode," Appl. Phys. Lett., vol.87, p. 173 505, 2005.
58. R. Jordan, L. Rothberg, A. Dodabalapur, and R. Slusher, "Efficiency enhancement of microcavity organic light emitting diodes," Appl. Phys. Lett., vol.69, p. 1997, 1996.
59. R. Meerheim, R. Nitsche, and K. Leo, "High-efficiency monochrome organic light emitting diodes employing enhanced microcavities," Appl. Phys. Lett., vol.93, p. 043310, 2008.
60. I. Tanaka and S. Tokito, "Precise measurement of external quantum efficiency of organic light-emitting devices," Jpn. J. Appl. Phys., vol.43, p. 7733, 2004.
61. B. D'Andrade and S. Forrest, "White organic light-emitting devices for solid-state lighting," Adv. Mater., vol.16, p. 1585, 2004.
62. H. Boerner, "OLEDs for lighting," in Proc. SPIE, 2006, vol.6192, p. 61920U.
63. J. Kido, K. Hongawa, K. Okuyama, and K. Nagal, "White light-emitting organic electroluminescent devices using the poly(N-vinylcarbazole) emitter layer doped with three fluorescent dyes," Appl. Phys. Lett., vol.64, p. 815, 1994.
64. J. Kido, M. Kimura, and K. Nagai, "Multilayer white light-emitting organic electroluminescent device," Science, vol.267, p. 1332, 1995.
65. B. D'Andrade, V. Adamovich, R. Hewitt, M. Hack, and J. J. Brown, "Phosphorescent organic light-emitting devices for solid-state lighting," in Proc. SPIE, 2005, vol.5937, p. 593 701.
66. G. Parthasarathy, G. Gu, and S. Forrest, "A full-color transparent metal-free stacked organic light emitting device with simplified pixel biasing," Adv. Mater., vol.11, p. 907, 1999.
67. G. Cheng, F. Li, Y. Duan, J. Feng, S. Liu, S. Qiu, D. Lin, Y. Ma, and S. Lee, "White organic light-emitting devices using a phosphorescent sensitizer," Appl. Phys. Lett., vol.82, p. 4224, 2003.
68. K. Cheon and J. Shinar, "Bright white small molecular organic light-emitting devices based on a red-emitting guest-host layer and blue-emitting 4,4(′)-bis(2,2(′)-eliphenylvinyl)-1,1′-biphenyl, " Appl. Phys. Lett., vol.81, p. 1738, 2002.
69. B. D'Andrade, M. Thompson, and S. Forrest, "Controlling exciton diffusion in multilayer white phosphorescent organic light emitting devices," Adv. Mater., vol.14, p. 147, 2002.
70. R. Deshpande, V. Bulovic, and S. Forrest, "White-light-emitting organic electroluminescent devices based on interlayer sequential energy transfer," Appl. Phys. Lett., vol.75, p. 888, 1999.
71. [71] Y. Huang, J. Jou, W. Weng, and J. Liu, "High-efficiency white organic light-emitting devices with dual doped structure," Appl. Phys. Lett., vol.80, p. 2782, 2002. (Pubitemid 34573556)
72. C. H. Jeong, J. T. Lim, M. S. Kim, J. H. Lee, J. W. Bae, and G. Y. Yeom, "Four-wavelength white organic light-emitting diodes using 4, 4′-bis-[carbazoyl-(9)]-stiloene as a deep blue emissive layer, Org. Electron., vol. 8, p. 683, 2007.
73. H. Kanno, Y. Sun, and S. Forrest, "High-efficiency top-emissive white-light-emitting organic electrophosphorescent devices," Appl. Phys. Lett., vol.86, p. 263 502, 2005.
74. D. Qin and Y. Tao, "White organic light-emitting diode comprising of blue fluorescence and red phosphorescence," Appl. Phys. Lett., vol.86, p. 113 507, 2005.
75. G. Schwartz, K. Fehse, M. Pfeiffer, K. Walzer, and K. Leo, "Highly efficient white organic light emitting diodes comprising an interlayer to separate fluorescent and phosphorescent regions," Appl. Phys. Lett., vol.89, p. 083509, 2006.
76. G. Schwartz, M. Pfeiffer, S. Reineke, K. Walzer, and K. Leo, "Harvesting triplet excitons from fluorescent blue emitters in white organic light-emitting diodes," Adv. Mater., vol.19, p. 3672, 2007.
77. G. Schwartz, K. Walzer, M. Pfeiffer, and K. Leo, "High-efficiency white organic-light-emitting diodes combining fluorescent and phosphorescent emitter systems," in Proc. SPIE, 2006, vol.6192, p. 61920Q.
78. R. Song, Y. Duan, S. Chen, Y. Zhao, J. Hou, and S. Liu, "White organic light-emitting devices employing phosphorescent iridium complex as RGB dopants," Semicond, Sci., Tech., vol.22, p. 728, 2007.
79. Y. Sun, N. Giebink, H. Kanno, B. Ma, M. Thompson, and S. Forrest, "Management of singlet and triplet excitons for efficient white organic light-emitting devices," Nature, vol.440, p. 908, 2006.
80. M. Tao, J. Ya-Dong, Y. Jun-Sheng, L. Shuang-Ling, L. Lu, and Z. Qing, "Bright white organic light-emitting diode mixed blue and green emission," Acta Phys. Chim. Sin., vol.24, p. 977, 2008.
81. S. Tokito, T. Iijima, T. Tsuzuki, and F. Sato, "High-efficiency white phosphorescent organic light-emitting devices with greenish-blue and red-emitting layers," Appl. Phys. Lett., vol.83, p. 2459, 2003.
82. Z. Xie, J. Huang, C. Li, S. Liu, Y. Wang, Y. Li, and J. Shen, "White light emission induced by confinement in organic multiheterostructures," Appl. Phys. Lett., vol.74, p. 641, 1999.
83. B.-P. Yan, C. C. C. Cheung, S. C. F. Kui, H.-F. Xiang, V. A. L. Roy, S.-J. Xu, and C.-M. Che, "Efficient white organic light-emitting devices based on phosphorescent platinum (II)/fluorescent dual-emitting layers," Adv. Mater., vol.19, p. 3599, 2007.
84. H. Yang, Y. Shi, Y. Zhao, J. Hou, and S. Liu, "Efficient white organic light-emitting devices using 4,7-diphenyl-1,10-phenanthroline as block layer," J. Lum., vol.127, p. 367, 2007.
85. H. Yang, Y. Shi, Y. Zhao, and S. Liu, "High-performance white organic light-emitting device using non-doped-type structure," Sol. Stat. Electron., vol.52, p. 657, 2008.
86. Y. Duan, M. Mazzeo, V. Maiorano, F. Mariano, D. Qin, R. Cingolani, and G. Gigli, "Extremely low voltage and high bright p-i-n fluorescent white organic light-emitting diodes," Appl. Phys. Lett., vol.92, p. 113304, 2008.
87. C. Chuen, Y. Tao, F. Wu, and C. Shu, "White organic light-emitting diodes based on 2,7-bis(2,2-diphenylvinyl)-9, 9'-spirobifluorene: Improvement in operational lifetime," Appl. Phys. Lett., vol.85, p. 4609, 2004.
88. B. D'Andrade, R. Holmes, and S. Forrest, "Efficient organic electrophosphorescent white-light-emitting device with a triple doped emissive layer," Adv. Mater., vol.16, p. 624, 2004.
89. C.-H. Hsiao, C.-F. Lin, and J.-H. Lee, "Driving voltage reduction in white organic light-emitting devices from selectively doping in ambipolar blue-emitting layer," J. Appl. Phys., vol.102, p. 094508, 2007.
90. C. H. Jeong, J. T. Lim, M. S. Kim, J. H. Lee, J. W. Bae, and G. Y. Yeom, "High efficiency white organic light-emitting diodes from one emissive layer," Jpn. J. Appl. Phys., vol.46, p. 806, 2007.
91. J.-H. Jou, C.-C. Chen, Y.-C. Chung, M.-T. Hsu, C-H. Wu, S.-M. Shen, M.-H. Wu, W.-B. Wang, Y.-C. Tsai, C-P. Wang, and J.-J. Shyue, "Nanodot-enhanced high-efficiency pure-white organic light-emitting diodes with mixed-host structures," Adv. Funct. Mater., vol.18, p. 121, 2008.
92. J.-H. Jou, C.-J. Wang, Y.-P. Lin, Y.-C. Chung, P.-H. Chiang, M.-H. Wu, C-P. Wang, C.-L. Lai, and C. Chang, "Color-stable, efficient fluorescent pure-white organic light-emitting diodes with device architecture preventing excessive exciton formation on guest," Appl. Phys. Lett., vol.92, p. 223 504, 2008.
93. G. Li and J. Shinar, "Combinatorial fabrication and studies of bright white organic light-emitting devices based on emission from rubrene-doped 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl," Appl. Phys. Lett., vol.83, p. 5359, 2003.
94. V. Adamovich, J. Brooks, A. Tamayo, A. Alexander, P. Djurovich, B. D'Andrade, C. Adachi, S. Forrest, and M. Thompson, "High efficiency single dopant white electrophosphorescent light emitting diodes," N. J. Chem., vol.26, p. 1171, 2002.
95. J. Kalinowski, M. Cocchi, D. Virgili, V. Tattori, and J. A. G. Williams, "Mixing of excimer and exciplex emission: A new way to improve white light emitting organic electrophosphorescent diodes, " Adv. Mater., vol.19, p. 4000, 2007.
96. M. Mazzeo, D. Pisignano, F. Delia Sala, J. Thompson, R. Blyth, G. Gigli, R. Cingolani, G. Sotgiu, and G. Barbarella, "Organic single-layer white light-emitting diodes by exciplex emission from spin-coated blends of blue-emitting molecules," Appl. Phys. Lett., vol.82, p. 334, 2003.
97. J. Thompson, R. Blyth, M. Mazzeo, M. Anni, G. Gigli, and R. Cingolani, "White light emission from blends of blue-emitting organic molecules: A general route to the white organic light-emitting diode?" Appl. Phys. Lett., vol.79, p. 560, 2001.
98. B. D'Andrade, J. Brooks, V. Adamovich, M. Thompson, and S. Forrest, "White light emission using triplet excimers in electrophosphorescent organic light-emitting devices," Adv. Mater., vol.14, p. 1032, 2002.
99. [99] A. Duggal, J. Shiang, C. Heller, and D. Foust, "Organic light-emitting devices for illumination Quality white light," Appl. Phys. Lett., vol.80, p. 3470, 2002. (Pubitemid 34637289)
100. T. Shiga, H. Fujikawa, and Y. Taga, "Design of multiwavelength resonant cavities for white organic light-emitting diodes," J. Appl. Phys., vol.93, p. 19, 2003.
101. A. Dodabalapur, L. Rothberg, and T. Miller, "Color variation with electroluminescent organic semiconductors in multimode resonant cavities," Appl. Phys. Lett., vol.65, p. 2308, 1994.
102. B. D'Andrade and S. Forrest, "Effects of exciton and charge confinement on the performance of white organic p-i-n electrophosphorescent emissive excimer devices," J. Appl. Phys., vol.94, p. 3101, 2003.
103. G. Schwartz, S. Reineke, K. Walzer, and K. Leo, "Reduced efficiency roll-off in high-efficiency hybrid white organic light-emitting diodes," Appl. Phys. Lett., vol.92, p. 053311, 2008.
104. X.-M. Yu, G.-J. Zhou, C.-S. Lam, W.-Y. Wong, X.-L. Zhu, J.-X. Sun, M. Wong, and H.-S. Kwok, "A yellow-emitting iridium complex for use in phosphorescent multiple-emissive-layer white organic light-emitting diodes with high color quality and efficiency," J. Org. Met. Chem., vol.693, p. 1518, 2008.
105. Y. Sun and S. Forrest, "Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids," Nature, vol.2, p. 483, 2008.
106. 2008. [Online]. Available: www.novaled.com
107. 2008. [Online]. Available: www.universaldisplay.com
108. 2008. [Online]. Available: www.osramos.com
109. T. Nakayama, K. Hiyama, K. Furukawa, and H. Ohtani, "Invited paper: Development of phosphorescent white OLED with extremely high power efficiency and long lifetime," J. Soc. Inf. Disp., vol.38, p. 1018, 2007.
110. G. Gu, V. Bulovic, P. Burrows, S. Forrest, and M. Thompson, "Transparent organic light emitting devices," Appl. Phys. Lett., vol.68, p. 2606, 1996.
111. G. Parthasarathy, P. Burrows, V. Khalfin, V. Kozlov, and S. Forrest, "A metal-free cathode for organic semiconductor devices," Appl. Phys. Lett., vol.72, p. 2138, 1998.
112. L. Hung and C. Tang, "Interface engineering in preparation of organic surface-emitting diodes," Appl. Phys. Lett., vol.74, p. 3209, 1999.
113. T. Dobbertin, M. Kroeger, D. Heithecker, D. Schneider, D. Metzdorf, H. Neuner, E. Becker, H. Johannes, and W. Kowalsky, "Inverted top-emitting organic light-emitting diodes using sputter-deposited anodes," Appl. Phys. Lett., vol.82, p. 284, 2003.
114. S. Han, X. Feng, Z. Lu, D. Johnson, and R. Wood, "Transparent- cathode for top-emission organic light-emitting diodes," Appl. Phys. Lett., vol.82, p. 2715, 2003.
115. L. Hung, C. Tang, M. Mason, P. Raychaudhuri, and J. Madathil, "Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes," Appl. Phys. Lett., vol.78, p. 544, 2001.
116. J. Cao, X. Jiang, and Z. Zhang, "MoOx modified ag anode for top-emitting organic light-emitting devices," Appl. Phys. Lett., vol.89, p. 252 108, 2006.
117. J. Cao, X. Liu, M. A. Khan, W. Zhu, X. Jiang, Z. Zhang, and S. Xu, "RGB tricolor produced by white-based top-emitting organic light-emitting diodes with microcavity structure," Curr. Appl. Phys., vol.7, p. 300, 2007.
118. C. Chen, P. Hsieh, H. Chiang, C. Lin, H. Wu, and C. Wu, "Top-emitting organic light-emitting devices using surface-modified ag anode," Appl. Phys. Lett., vol.83, p. 5127, 2003.
119. M. S. Kim, C. H. Jeong, J. T. Lim, and G. Y. Yeom, "White top-emitting organic light-emitting diodes using one-emissive layer of the DCJTB doped DPVBi layer," Thin Solid Films, vol.516, p. 3590, 2008.
120. S. Lin, H. Ueng, and F. Juang, "Effects of thickness of organic and multilayer anode on luminance efficiency in top-emission organic light emitting diodes," Jpn. J. Appl. Phys. 1, vol.45, p. 3717, 2006.
121. Z. Wu, H. Guo, J. Wang, and S. Liu, "Top-emitting organic light-emitting devices with improved light outcoupling and angle-independence, " J. Phys. D Appl. Phys., vol.39, p. 5160, 2006.
122. F. Jean, J. Mulot, B. Geffroy, C. Denis, and P. Cambon, "Microcavity organic light-emitting diodes on silicon," Appl. Phys. Lett., vol.81, p. 1717, 2002.
123. S. Hsu, C. Lee, S. Hwang, and C. Chen, "Highly efficient top-emitting white organic electroluminescent devices," Appl. Phys. Lett., vol.86, p. 253 508, 2005.
124. X. Zhu, J. Sun, X. Yu, M. Wong, and H.-S. Kwok, "High-performance top-emitting white organic light-emitting devices," Jpn. J. Appl. Phys. 1, vol.46, p. 4054, 2007.
125. J. T. Lim, C. H. Jeong, M. S. Kim, J. H. Lee, j. W. Bae, and G. Y. Yeom, "Top-emitting organic light-emitting diodes using Cs/Al/Ag cathodes," Jpn. J. Appl. Phys. 1, vol.46, p. 4296, 2007.
126. H. Choi, S. Kim, W. Kim, and J. Lee, "Enhancement of electron injection in inverted top-emitting organic light-emitting diodes using an insulating magnesium oxide buffer layer," Appl. Phys. Lett., vol.87, p. 082102, 2005.
127. S. Park, J. Choi, E. Kim, and S. Im, "Inverted top-emitting organic light-emitting diodes using transparent conductive NiO electrode," Appl. Surf Sci., vol.244, p. 439, 2005.
128. M.-T. Lee and M.-R. Tseng, "Efficient, long-life and lambertian source of top-emitting white OLEDs using low-reflectivity molybdenum anode and co-doping technology," Curr. Appl. Phys., vol.8, p. 616, 2008.
129. C. Chen, C. Lin, and C. Wu, "An effective cathode structure for inverted top-emitting organic light-emitting devices," Appl. Phys. Lett., vol.85, p. 2469, 2004.
130. X. Zhou, M. Pfeiffer, J. Huang, J. Blochwitz-Nimoth, D. Qin, A. Werner, J. Drechsel, B. Maennig, and K. Leo, "Low-voltage inverted transparent vacuum deposited organic light-emitting diodes using electrical doping," Appl. Phys. Lett., vol.81, p. 922, 2002.
131. M. Pfeiffer, S. Forrest, X. Zhou, and K. Leo, "A low drive voltage, transparent, metal-free n-i-p electrophosphorescent light emitting diode," Org. Electron., vol.4, p. 21, 2003.
132. T. Cho, C. Lin, and C. Wu, "Microcavity two-unit tandem organic light-emitting devices having a high efficiency," Appl. Phys. Lett., vol.88, p. 111 106, 2006.
133. Q. Huang, K. Walzer, M. Pfeiffer, V. Lyssenko, G. He, and K. Leo, "Highly top emitting organic light-emitting diodes with organic outcoupling enhancement layers," Appl. Phys. Lett., vol.88, p. 113 515, 2006.
134. A. Dodabalapur, L. Rothberg, T. Miller, and E. Kwock, "Microcavity effects in organic semiconductors," Appl. Phys. Lett., vol.64, p. 2486, 1994.
135. H. Riel, S. Karg, T. Beierlein, B. Ruhstaller, and W. Riess, "Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling," Appl. Phys. Lett., vol.82, p. 466, 2003.
136. C. Lin, T. Cho, C. Chang, and C. Wu, "Enhancing light outcoupling of organic light-emitting devices by locating emitters around the second antinode of the reflective metal electrode," Appl. Phys. Lett., vol.88, p. 081114, 2006.
137. H. Aziz and Z. Popovic, "Degradation phenomena in small-molecule organic light-emitting devices," Chem. Mater., vol.16, p. 4522, 2004.
138. P. E. Burrows, V. Bulovic, S. R. Forrest, L. S. Sapochak, D. M. McCarty, and M. E. Thompson, "Reliability and degradation of organic light emitting devices," Appl. Phys. Lett., vol.65, p. 2922, 1994.
139. J. McElvain, H. Antoniadis, M. Hueschen, J. Miller, D. Roitman, J. Sheats, and R. Moon, "Formation and growth of black spots in organic light-emitting diodes," J. Appl. Phys., vol.80, p. 6002, 1996.
140. Y. Liew, H. Aziz, N. Hu, H. Chan, G. Xu, and Z. Popovic, "Investigation of the sites of dark spots in organic light-emitting devices," Appl. Phys. Lett., vol.77, p. 2650, 2000.
141. H. Antoniadis, M. Hueschen, J. McElvain, J. Miller, R. Moon, D. Roitman, and J. Sheats, "Failure modes in organic light emitting diodes," in Proc. Spe/Antec, 1997, vol.724, p. 1266.
142. Y. Kim, D. Choi, H. Lim, and C. Ha, "Accelerated pre-oxidation method for healing progressive electrical short in organic light-emitting devices," Appl. Phys. Lett., vol.82, p. 2200, 2003.
143. M. Schaer, F. Nuesch, D. Berner, W. Leo, and L. Zuppiroli, "Water vapor and oxygen degradation mechanisms in organic light emitting diodes," Adv. Funct. Mater., vol.11, p. 116, 2001.
144. W. Wang, S. Lim, and S. Chua, "Bubble formation and growth in organic light-emitting diodes composed of a polymeric emitter and a calcium cathode," J. Appl. Phys., vol.91, p. 5712, 2002.
145. L. Liao, J. He, X. Zhou, M. Lu, Z. Xiong, Z. Deng, X. Hou, and S. Lee, "Bubble formation in organic light-emitting diodes," J. Appl. Phys., vol.88, p. 2386, 2000.
146. L. Ke, S. Chua, K. Zhang, and P. Chen, "Bubble formation due to electrical stress in organic light emitting devices," Appl. Phys. Lett., vol.80, p. 171, 2002.
147. S. R. Forrest, "Ultrathin organic films grown by organic molecular beam deposition and related techniques," Chem. Rev., vol.97, p. 793, 1997.
148. J. Drechsel, A. Petrich, M. Koch, S. Pfützner, R. Meerheim, S. Scholz, K. Walzer, M. Pfeiffer, and K. Leo, "Influence of material purification by vacuum sublimation on organic optoelectronic device performance," in SID Digest Tech. Pap., 2006, vol.XXXVII, p. 1692.
149. F. Steuber, J. Staudigel, M. Stössel, J. Simmerer, A. Winnacker, H. Spreitzer, F. Weissörtel, and J. Salbeck, "White light emission from organic leds utilizing spiro compounds with high-temperature stability," Adv. Mater., vol.12, p. 130, 2000.
150. L. Soltzberg, J. Slinker, S. Flores-Torres, D. Bernards, G. Malharas, H. Abruna, J.-S. Kim, R. Friend, M. Kaplan, and V. Goldberg, "Identification of a quenching species in ruthenium tris-bipyridine electroluminescent devices," J. Am. Chem. Soc., vol.128, p. 7761, 2006.
151. D. Kondakov, W. Lenhart, and W. Nichols, "Operational degradation of organic light-emitting diodes: Mechanism and identification of chemical products," J. Appl. Phys., vol.101, p. 024512, 2007.
152. T. Marks, "Electrically conductive metallomacrocyclic assemblies," Science, vol.227, p. 881, 1985.
153. M. Maitrot, G. Guillaud, B. Boudjema, J. Andre, and J. Simon, "Molecular material based junctions: Formation of a schottky contact with metallophatlocyanine thin films doped by the cosublimation method," J. Appl. Phys., vol.60, p. 2396, 1986.
154. R. Meerheim, K. Walzer, M. Pfeiffer, and K. Leo, "Ultrastable and efficient red organic light emitting diodes with doped transport layers," Appl. Phys. Lett., vol.89, p. 061111, 2006.
155. P. Wellmann, M. Hofmann, O. Zeika, A. Werner, J. Birnstock, R. Meerheim, G. He, K. Walzer, M. Pfeiffer, and K. Leo, "High-efficiency p-i-n organic light-emitting diodes with long lifetime," J. Soc. Inf. Disp., vol.13, p. 393, 2005.
156. M. Lee, C. Liao, C. Tsai, and C. Chen, "Highly efficient, deep-blue doped organic light-emitting devices," Adv. Mater., vol.17, p. 2493, 2005.
157. S. Wen, M. Lee, and C. Chen, "Recent development of blue fluorescent OLED materials and devices," IEEE/OSA J. Disp. Tech., vol.1, p. 90, 2005.