Open access emission characteristics of organic light-emitting diodes and organic thin-films with planar and corrugated structures

International Journal of Molecular Sciences

Volumn 11, Issue 4, 2010, Pages 1527-1545

  Wei, Mao Kuo ^a   Lin, Chii Wann ^b   Yang, Chih Chung ^b   Kiang, Yean Woei ^b   Lee, Jiun Haw ^b   Lin, Hoang Yan ^b  

^a NATIONAL DONG HWA UNIVERSITY   (Taiwan)

^b NATIONAL TAIWAN UNIVERSITY   (Taiwan)

Author keywords

Extraction efficiency; Microstructure; OLED

Indexed keywords

ELECTRODE; ELLIPSOMETRY; EQUIPMENT DESIGN; FILM; LIGHT EMITTING DIODE; LIGHT REFRACTION; LIGHT SCATTERING; OPTICAL INSTRUMENTATION; ORGANIC LIGHT EMITTING DIODE; OSCILLATOR; REVIEW; SURFACE PLASMON RESONANCE; CHEMISTRY; DIODE LASER; EXTRACTION EFFICIENCY; ILLUMINATION; MICROSTRUCTURE; OLED;

GLASS; INDIUM TIN OXIDE; ORGANIC COMPOUND; TIN DERIVATIVE;

EXTRACTION EFFICIENCY; MICROSTRUCTURE; OLED;

ELECTRODES; GLASS; LASERS, SEMICONDUCTOR; LIGHTING; ORGANIC CHEMICALS; TIN COMPOUNDS;

EID: 77951966879     PISSN: None     EISSN: 14220067     Source Type: Journal    
DOI: 10.3390/ijms11041527     Document Type: Review

References (98)

1. Lin, C.H.; Chattopadhyay, S.; Hsu, C.W; Wu, M.H.; Chen, W.C.; Wu, C.T.; Tsen, S. C.; Hwang, J.S.; Lee, J.H.; Chen, C.W.; Chen, C.H.; Chen, L.C.; Chen, K.H. Enhanced charge separation by sieve-layer mediation in high efficiency inorganic-organic solar cell. Adv. Mater. 2009, 21, 759-763.
2. Lin, C.H.; Tseng, S.C.; Liu, Y.K.; Tai, Y.; Chattopadhyay, S.; Lin, C.F.; Lee, J.H.; Hwang, J.S.; Hsu, Y.Y.; Chen, L.C.; Chen, W.C.; Chen, K.H. Suppressing series resistance in organic solar cells by oxygen plasma treatment. Appl. Phys. Lett. 2008, 92, 233302:1-233302:3.
3. Chen, Y.M.; Lin, C.F.; Lee, J.H.; Huang, J.J. Quasi-static capacitance-voltage characterizations of carrier accumulation and depletion phenomena in pentacene thin-film transistors. Solid-State Electron. 2008, 52, 269-274.
4. Kuo, C.H.; Peng, K.C.; Kuo, L.C.; Yang, K.H.; Lee, J.H.; Leung, M.K.; Hsieh, K.H. High performance hole-transporting polyurethanes for light-emitting diodes applications. Chem. Mat. 2006, 18, 4121-4129.
5. Hirano, T.; Matsuo, K.; Kohinata, K.; Hanawa, K.; Matsumi, T.; Matsuda, E.; Matsuura, R.; Ishibashi, T.; Yoshida A.; Sasaoka, T. Novel laser transfer technology for manufacturing large- sized OLED displays. SID Tech. Digest 2007, 1592-1595.
6. Hsiao, C.H.; Lin, C.F.; Lee, J.H. Driving voltage reduction in white organic light-emitting devices from selectively doping in ambipolar blue emitting layer. J. Appl. Phys. 2007, 102, 094508:1-094508:6.
7. Chiu, T.L.; Lee, J.H. Color gamut variation of LED-lit LCD at different module temperatures. Opt. Commun. 2010, 283, 373-378.
8. Lu, C.F.; Huang, C.F.; Chen, Y.S.; Shiao, W.Y.; Chen, C.Y.; Lu, Y.C.; Yang, C.C. Phosphor-free monolithic white-light LED. IEEE J. Sel. Top. Quantum Electron. 2009, 15, 1210-1217.
9. Lee, J.H.; Liu, D.N.; Wu, S.T. Introduction to Flat Panel Displays, 1st ed.; John Wiley & Sons Ltd: West Sussex, UK, 2008; pp. 205-210.
10. Cho, H.; Yun, C.; Park J.W.; Yoo, S. Highly flexible organic light-emitting diodes based on Zns/Ag/WO3 multilayer transparent electrodes. Org. Electron. 2009, 10, 1163-1169.
11. Liu, S.W.; Lee, C.C.; Wang, C.H.; Lee, J.H.; Chen, C.T.; Wang, J.K. Enhancing performance of planar molecule-based organic light-emitting diodes through deposition-rate optimization: Role of molecular packing. Chem. Phys. Lett. 2009, 474, 207-211
12. Lee, J.H.; Wu, C.I.; Liu, S.W.; Huang, C.A.; Chang, Y. Mixed host organic light-emitting devices with low driving voltage and long lifetime. Appl. Phys. Lett. 2005, 186, 103506:1-103506:3.
13. Lee, J.H.; Huang, C.L.; Hsiao, C.H.; Leung, M.K.; Yang, C.C.; Chao, C.C. Blue phosphorescent organic light-emitting device with double emitting layer. Appl. Phys. Lett. 2009, 94, 223301:1-223301:3.
14. Fukuda, Y.; Watanabe, T.; Wakimoto, T.; Miyaguchi, S.; Tsuchida, M. An organic LED display exhibiting pure RGB colors. Synth. Met. 2000, 111/112, 1-6.
15. Wedge, S; Giannattasio, A.; Barnes W.L. Surface plasmon-polariton mediated emission of light from top-emitting organic light-emitting diode type structures. Org. Electron. 2007, 8, 136-147.
16. Möller, S; Forrest, S.R. Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays. J. Appl. Phys. 2002, 91, 3324-3327.
17. Wei, M.K.; Lee, J.H.; Lin, H.Y.; Ho, Y.H.; Chen, K.Y.; Lin, C.C.; Wu, C.F.; Lin, H.Y.; Tsai, J.H.; Wu, T.C. Efficiency improvement and spectral shift of an organic light-emitting device by attaching a hexagon-based microlens array. J. Opt. A: Pure Appl. Opt. 2008, 10, 055302:1-055302:9.
18. Lin, L.; Shia, T.K.; Chiu, C.J. Silicon-processed plastic micropyramids for brightness enhancement applications. J. Micromech. Microeng. 2000, 10, 395-400.
19. Pope, M.; Kallmann, H.; Magnante, P. Electroluminescence in organic crystals. J. Chem. Phys. 1963, 38, 2042-2043.
20. Tang, C.W.; Vanslyke, S.A. Organic electroluminescent diodes. Appl. Phys. Lett., 1987, 951, 913-915.
21. Liu, S.W.; Lee, J.H.; Lee, C.C.; Chen, C.T.; Wang, J.K. Charge carrier mobility of mixed layer organic light-emitting diodes. Appl. Phys. Lett. 2007, 91, 142106:1-142106:3.
22. Leung, M.K.; Yang, C.C.; Lee, J.H.; Tsai, H.H.; Lin, C.F.; Huang, C.Y.; Su, Y.O.; Chiu, C.F. The unusual electrochemical and photophysical behavior of 2,2'-bis(1,3,4-oxadiazol-2-yl)biphenyls, effective electron transport hosts for phosphorescent organic light emitting diodes. Org. Lett. 2007, 9, 235-238.
23. Lee, J.H.; Hsiao, C.H.; Tseng, C.A. Electrical current aging of mixed-host organic light-emitting devices with thin doped layer. J. Electrochem. Soc. 2009, 156, J342-J346.
24. Liu, S.W.; Huang, C.A; Lee, J.H.; Yang, K.H.; Chen, C.C.; Chang, Y. Blue mixed host organic light emitting devices. Thin Solid Films 2004, 453-454, 312-315.
25. Kahen, K.B. Rigorous optical modeling of multilayer organic light-emitting diode devices. Appl. Phys. Lett. 2001, 78, 1649-1651.
26. Huang, J.; Li, G.; Wu, E.; Xu, Q.; Yang, Y. Achieving high-efficiency polymer white-light- emitting devices. Adv. Mater. 2006, 18, 114-117.
27. Hung, L.S.; Chen, C.H. Recent progress of molecular organic electroluminescent materials and devices. Mater. Sci. Eng. R 2002, 139, 143-222.
28. Hsiao, C.H.; Lee, J.H.; Tseng, C.A. Probing recombination-rate distribution in organic light- emitting devices with mixed-emitter structure. Chem. Phys. Lett. 2006, 427, 305-309.
29. Shirota, Y.; Kuwabara, Y.; lnada, H.; Wakimoto, T.; Nakada, H.; Yonemoto, Y.; Kawami, S.; lmai, K. Multilayered organic electroluminescent device using a novel starburst molecule, 4,4',4"- tris(3-methylphenylphenylamino)triphenylamine, as a hole transport material. Appl. Phys. Lett. 1994, 65, 807-809.
30. Lee, J.H.; Ho, Y.H.; Lin, T.C.; Wu, C.F. High efficiency fluorescent blue organic light-emitting device with balanced carrier transport. J. Electrochem. Soc. 2007, 154, J226-J228.
31. Lee, J.H.; Tsai, H.H.; Leung, M.K.; Yang, C.C.; Chao, C.C. Phosphorescent organic light- emitting device with an ambipolar oxadiazole host. Appl. Phys. Lett. 2007, 90, 243501:1-243501:3.
32. Leung, M.K.; Chang, C.C.; Wu, M.H.; Chuang, K.H.; Lee, J.H.; Shieh, S.J.; Lin, S.C.; Chiu, C.F. 6-N,N-diphenylaminobenzofuran-derived pyran containing fluorescent dyes: a new class of high- brightness red-light-emitting dopants for OLED. Org. Lett. 2006, 8, 2623-2626.
33. Brütting, W; Berleb, S.; Mückl, A.G. Device physics of organic light-emitting diodes based on molecular materials. Org. Electron. 2001, 2, 1-36.
34. Hsiao, C.H.; Lee, J.H. Emitting-layer design of white organic light-emitting devices with single- host material. J. Appl. Phys. 2009, 106, 024503:1-024503:7.
35. Zhou, X; Pfeiffer, M; Blochwitz, J.; Werner, A.; Nollau, A.; Fritz, T; Leo, K. Very-low-operating- voltage organic light-emitting diodes using a p-doped amorphous hole injection layer. Appl. Phys. Lett. 2001, 78, 410-412.
36. Lee, J.H.; Wu, M.H.; Chao, C.C.; Chen, H.L.; Leung, M.K. High efficiency and long lifetime OLED based on a metal-doped electron transport layer. Chem. Phys. Lett. 2005, 416, 234-237.
37. Choy, W.C.H.; Fong, H.H. Comprehensive investigation of absolute optical properties of organic materials. J. Phys. D: Appl. Phys. 2008, 41, 155109:1-155109:7.
38. Hsiao, C.H.; Chen, Y.H.; Lin, T.C.; Hsiao, C.C.; Lee, J.H. Recombination zone in mixed-host organic light-emitting devices. Appl. Phys. Lett. 2006, 89, 163511:1-163511:3.
39. Chen, X.W.; Choy, W.C.H.; He, S. Efficient and rigorous modeling of light emission in planar multilayer organic light-Emitting diodes. IEEE/OSA J. Display Technol. 2007, 3, 110-117.
40. Chen, H.C.; Lee, J.H.; Shiau, C.C.; Yang, C.C.; Kiang, Y.W. Electromagnetic modeling of organic light-emitting devices. IEEE/OSA J. Lightwave Technol. 2006, 24, 2450-2457.
41. So, S.K.; Choi, W.K.; Leung, L.M.; Neyts, K. Interference effects in bilayer organic light-emitting diodes. Appl. Phys. Lett. 1999, 74, 1939-1941.
42. Lewis, J.S.; Weaver, M.S. Thin-film permeation-barrier technology for flexible organic light- emitting devices. IEEE J. Sel. Top. Quantum. Electron. 2004, 10, 45-57.
43. Lee, J.H.; Huang, J.J.; Liao, C.C.; Hu, P.J.; Chang, Y. Operation lifetime of organic light-emitting devices with different layer structures. Chem. Phys. Lett. 2005, 402, 335-339.
44. Lee, C.J.; Pode, R.B.; Moon, D.G.; Han, J.I. Realization of an efficient top emission organic light- emitting device with novel electrodes. Thin Solid Films 2004, 467, 201-208.
45. Meng, Z.; Wong, M. Active-matrix organic light emitting diode displays realized using metal- induced unilaterally crystallized polycrystalline silicon thin-film transistors. IEEE Trans. Electron. Dev. 2003, 49, 991-996.
46. Chen, X.W.; Choy, W.C.H.; He, S.; Chui, P.C. Comprehensive analysis and optimal design of top-emitting organic light-emitting devices. J. Appl. Phys. 2007, 101, 113107:1-113107:6.
47. Chen, X.W.; Choy, W.C.H.; Liang, C.J.; Wai, P.K.A.; He, S. Modifications of the exciton lifetime and internal quantum efficiency for organic light-emitting devices with a weak/strong microcavity. Appl. Phys. Lett. 2007, 91, 221112:1-221112:3.
48. Choy, W.C.H.; Niu, J.H.; Li, W.L.; Chui, P.C. Voltage-controlled colour-tunable microcavity OLEDs with enhanced colour purity. J. Phys. D: Appl. Phys. 2008, 41, 025106:1-025106:5.
49. Liu, K.C.; Lu, Y.H.; Liao, Y.H.; Huang, B.S. Utilizing transparent ZnO thin film as permeation barrier to improve light outcoupling and longevity of top-emission polymer light-emitting devices. Jpn. J. Appl. Phys. 2008, 47, 3162-3166.
50. Liu, K.C.; Teng, C.W.; Lu, Y.H.; Lee, J.H.; Chen, L.C. Improving the performance of transparent PLEDs with LiF/Ag/ITO cathode. Electrochem. Solid State Lett. 2007, 10, J120-J122.
51. Gu, G.; Parthasarathy, G.; Burrows, P.E.; Tian, P.; Hill, I.G.; Kahn, A.; Forrest, S.R. Transparent stacked organic light emitting devices: I. Design principles and transparent compound electrodes. J. Appl. Phys. 1999, 86, 4067-4075.
52. Gu, G., Parthasarathy, G., Tian, P. Burrows, P.E.; Forrest, S.R. Transparent stacked organic light emitting devices: II. Device performance and applications to displays. J. Appl. Phys. 1999, 86, 4076-4084.
53. Matsumoto, T.; Nakada, T.; Endo, J.; Mori, K.; Kavamura, N.; Yokoi, A.; Kido, J. Multiphoton organic EL device having charge generation layer. SID Tech. Digest 2003, 34, 979-981.
54. Korshak, A.N.; Gribnikov, Z.S.; Mitin, V.V. Tunnel-junction-connected distributed-feedback verticalcavity surface-emitting laser. Appl. Phys. Lett. 1998, 73, 1475-1477.
55. Gu, G.; Forrest, S.R. Design of flat-panel displays based on organic light-emitting devices. IEEE J. Sel. Top. Quantum Electron. 1998, 4, 83-99.
56. Takada, N.; Tsutsui, T.; Saito, S. Control of emission characteristics in organic thin-film electroluminescent diodes using an optical-microcavity structure. Appl. Phys. Lett. 1993, 63, 2032-2034.
57. Yeh, S. J.; Chen, H.Y.; Wu, M.F.; Chan, L.H.; Chiang, C.L.; Yeh, H.C.; Chen, C.T.; Lee, J.H. All non-dopant red-green-blue composing white organic light-emitting diodes. Org. Electron. 2006, 7, 137-143.
58. Do, R.; Kim, Y.C.; Song, Y.W.; Lee, Y.H. Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure. J. Appl. Phys. 2004, 96, 7629-7636.
59. Lu, M.H.; Weaver, M.S.; Zhou, T.X.; Rothman, M.; Kwong, R.C.; Hack M.; Brown, J.J. High- efficiency top-emitting organic light-emitting devices. Appl. Phys. Lett. 2002, 81, 3921-3923.
60. Chen, C.W.; Hsieh, P.Y.; Chiang, H.H.; Lin, C.L.; Wu, H.M.; Wu, C.C. Top-emitting organic light-emitting devices using surface-modified Ag anode. Appl. Phys. Lett. 2003, 83, 5127-5129.
61. Liu, K.C.; Teng, C.W.; Lu, Y.H.; Tsai, Y.C.; Chou, S.H. Experimental study on transparent polymer light emitting diodes using LiF/Ag/indium tin oxide cathode. Jpn. J. Appl. Phys. 2007, 46, 2704-2708.
62. Parthasarathy, G.; Burrows, P.E.; Khalfin, V.; Kozlov, V.G.; Forrest, S.R. A metal-free cathode for organic semiconductor devices. Appl. Phys. Lett. 1998, 72, 2138-2140.
63. Hung L.S.; Tang, C.W. Interface engineering in preparation of organic surface-emitting diodes. Appl. Phys. Lett. 1999, 74, 3209-3211.
64. Parthasarathy, G.; Adachi, C.; Burrows, P.E.; Forrest, S.R. High-efficiency transparent organic light-emitting devices. Appl. Phys. Lett. 2000, 76, 2128-2130.
65. Xie, Z.; Hung, L.S.; Zhu, F. A flexible top-emitting organic light-emitting diode on steel foil. Chem. Phys. Lett. 2003, 381, 691-696.
66. Riel, H.; Karg, S.; Beierlein, T.; Rieß, W. Tuning the emission characteristics of top-emitting organic light-emitting devices by means of a dielectric capping layer: An experimental and theoretical study. J. Appl. Phys. 2003, 94, 5290-5296.
67. Lee, J.H.; Chen, K.Y.; Hsiao, C.C.; Chen, H.C.; Chang C.H.; Kiang, Y.W.; Yang, C.C. Radiation simulations of top-emission organic light-emitting devices with two- and three-microcavity structures. IEEE/OSA J. Display Technol. 2006, 2, 130-137.
68. Matterson, B.J.; Lupton, L.M.; Safonov, A.F.; Salt, M.G.; Barnes W.L.; Samuel, I.D.W. Increased efficiency and controlled light output from a microstructured light-emitting diode. Adv. Mater. 2001, 13, 123-127.
69. Yates, C.J.; Samuel, I.D.W., Burn, P.L.; Wedge, S.; Barnes, W.L. Surface plasmon-polariton mediated emission from phosphorescent dendrimer light-emitting diodes. Appl. Phys. Lett. 2006, 88, 161105:1-161105:3.
70. Lee, Y.J., Kim, S.H., Huh, J.; Kim, G.H.; Lee, Y.H.; Cho, S.H.; Kim, Y.C.; Do, Y.R. A high- extraction-efficiency nanopatterned organic light-emitting diode. Appl. Phys. Lett. 2003, 82, 3779-3781.
71. Fichet, G.; Corcoran, N.; Ho, P.K.H.; Arias, A.C.; MacKenzie, J.D.; Huch, W.T.S.; Friend, R.H. Self-organized photonic structures in polymer light-emitting diodes. Adv. Mater. 2004, 16, 1908-1912.
72. Höfler, T.; Weiberger, M.; Kern, W.; Rentenberger, S.; Pogantsch, A. Modifying the output characteristics of an organic light-emitting device by refractive-index modulation. Adv. Funct. Mater. 2004, 16, 2369-2373.
73. Nien, S.Y.; Chiu, N.F.; Ho, Y.H.; Lee, J.H.; Lin, C.W.; Wu, K.C.; Lee, C.K.; Lin, J.R.; Wei, M.K.; Chiu, T.L. Directional photoluminescence enhancement of organic emitters via surface plasmon coupling. Appl. Phys. Lett. 2009, 94, 103304:1-103304:3.
74. Peng, H.J.; Ho, Y.L.; Yu, X.J.; Kwok, H.S. Enhanced coupling of light from organic light emitting diodes using nanoporous films. J. Appl. Phys. 2004, 96, 1649-1654.
75. Chiu, N.F.; Yu, C.; Nien, S.Y.; Lee, J.H.; Kuan, C.H.; Wu, K.C.; Lee, C.K.; Lin, C.W. Enhancement and tunability of active plasmonic by multilayer grating coupled emission. Opt. Express 2007, 15, 11608-11615.
76. Chiu, N.F.; Lin, C.W.; Lee, J.H.; Kuan, C.H.; Wu, K.C.; Lee, C.K. Enhanced luminescence of organic/metal nanostructure for grating coupler active long-range surface plasmonic device. Appl. Phys. Lett. 2007, 91, 083114:1-083114:3.
77. Gu, G.; Garbuzov, D.Z.; Burrows, P.E.; Venkatesh, S.; Forrest, S.R.; Thompson, M.E. High- external-quantum-efficiency organic light-emitting devices. Opt. Lett. 1997, 22, 396-398.
78. Tsutsui, T.; Yahiro, M.; Yokogawa, H.; Kawano, K.; Yokoyama, M. Doubling coupling-out efficiency in organic light-emitting devices using a thin silica aerogel layer. Adv. Mater. 2001, 13, 1149-1152.
79. Yamasaki, T.; Sumioka K.; Tsutsui, T. Organic light-emitting device with an ordered monolayer of silica microspheres as a scattering medium. Appl. Phys. Lett. 2000, 76, 1243-1245.
80. Shiang, J.J.; Duggal, A.R. Application of radiative transport theory to light extraction from organic light emitting diodes. J. Appl. Phys. 2004, 95, 2880-2888.
81. Shiang, J.J.; Faircloth, T.J.; Duggal, A.R. Experimental demonstration of increased organic light emitting device output via volumetric light scattering; J. Appl. Phys. 2004, 95, 2889-2895.
82. Lin, H.Y.; Lee, J.H.; Wei, M.K.; Dai, C.L.; Wu, C.F.; Ho, Y.H.; Lin, H.Y.; Wu, T.C. Improvement of the outcoupling efficiency of an organic light-emitting device by attaching microstructured films. Opt. Commun. 2007, 275, 464-469.
83. Madigan, C.F.; Lu, M.H.; Sturm, J.C. Improvement of output coupling efficiency of organic light- emitting diodes by backside substrate modification. Appl. Phys. Lett. 2000, 76, 1650-1652.
84. Wei, M.K.; Lin, H.Y.; Lee, J.H.; Chen, K.Y.; Ho, Y.H.; Lin, C.C.; Wu, C.F.; Lin, H.Y.; Tsai, J.H.; Wu, T.C. Efficiency improvement and spectral shift of an organic light-emitting device with a square-based microlens array. Opt. Commun. 2008, 281, 5625-5632.
85. Lee, J.H.; Ho, Y.H.; Chen, K.Y.; Lin, H.Y.; Fang, J.H.; Hsu, S.C.; Lin, J.R.; Wei, M.K. Efficiency improvement and image quality of organic light-emitting display by attaching cylindrical microlens arrays. Opt. Express 2008, 16, 21184-21190.
86. Lim, J.; Oh, S.S.; Kim, D.Y.; Cho, S.H.; Kim, I.T.; Han, S.H.; Takezoe, H.; Choi, E.H.; Cho, G.S.; Seo, Y.H.; Kang, O.; Park, B. Enhanced out-coupling factor of microcavity organic lightemitting devices with irregular microlens array. Opt. Express 2006, 14, 6564-6571.
87. Wei, M.K.; Su, I.L. Method to evaluate the enhancement of luminance efficiency in planar OLED light emitting devices for microlens array. Opt. Express 2004, 12, 5777-5782.
88. Sun, Y.; Forrest, S.R. Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography. J. Appl. Phys. 2006, 100, 073106:1-073106:6.
89. Lin, H.Y.; Ho, Y.H.; Lee, J.H.; Chen, K.Y.; Fang, J.H.; Hsu, S.C.; Wei, M.K.; Lin, H.Y.; Tsai, J.H.; Wu, T.C. Patterned microlens array for efficiency improvement of small-pixelated organic light-emitting devices. Opt. Express 2008, 16, 11044-11051.
90. Chen, M.L.; Wei, A.C.; Shieh, H.P.D. Increased organic light-emitting diode panel light efficiency by optimizing structure and improving alignment of pyramidal array light-enhancing layers. Jpn. J. Appl. Phys. 2007, 46, 1521-1525.
91. Cheng, Y.H.; Wu, J.L.; Cheng, C.H.; Syao, K.C.; Lee, M.C.M. Enhanced light outcoupling in a thin film by texturing meshed surfaces. Appl. Phys. Lett. 2007, 90, 091102:1-091102:3.
92. Sun, Y.; Forrest, S.R. Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids. Nat. Photonics 2008, 2, 483-487.
93. Reineke, S.; Lindner, F.; Schwartz, G.; Seidler, N.; Walzer, K.; Lüssem, B.; Leo, K. White organic light-emitting diodes with fluorescent tube efficiency. Nature 2009, 459, 234-239.
94. Lee, J.H.; Zhu, X.; Lin, Y.H.; Choi, W.K.; Lin, T.C.; Hsu, S.C.; Lin, H.Y.; Wu, S.T. High ambient-contrast-ratio display using tandem reflective liquid crystal display and organic light- emitting device. Opt. Express 2005, 13, 9431-9438.
95. Lee, J.H.; Liao, C.C.; Hu, P.J., Chang, Y. High contrast ratio organic light-emitting devices based on CuPC as electron transport material. Synth. Met. 2004, 144, 279-283.
96. Chiu, T.L.; Xu, W.F.; Lin, C.F.; Lee, J.H.; Chao, C.C.; Leung, M.K. Optical and electrical characteristics of Ag-doped perylene diimide derivative. Appl. Phys. Lett. 2009, 94, 013307:1-013307:3.
97. Chiu, T.L.; Chuang, K.H.; Lin, C.F.; Ho, Y.H.; Lee, J.H.; Chao, C.C.; Leung, M.K.; Wan, D.H.; Li, C.Y.; Chen, H.L. Low reflection and photo-sensitive organic light-emitting device with perylene diimide and double-metal structure. Thin Solid Films 2009, 517, 3712-3716.
98. Chiu, T.L.; Xianyu, H.; Ge, Z.; Lee, J.H.; Liu, K.C.; Wu, S.T. Transflective device with a transparent organic light-emitting diode and a reflective liquid crystal device. J. SID 2009, 17/12, 1009-1013.