Light-emitting devices with conjugated polymers

International Journal of Molecular Sciences

Volumn 12, Issue 3, 2011, Pages 1575-1594

  Deng, Xian Yu ^a  

^a HARBIN INSTITUTE OF TECHNOLOGY   (China)

Author keywords

Conjugated polymer; Flat panel display; Light emission; PLED

Indexed keywords

POLYMER; POLY(3,4-ETHYLENEDIOXYTHIOPHENE)-POLY(STYRENESULFONATE); POLYSTYRENE DERIVATIVE; THIOPHENE DERIVATIVE;

CONJUGATION; ELECTRIC ACTIVITY; ELECTRIC CONDUCTIVITY; EQUIPMENT DESIGN; LIGHT EMITTING DIODE; MATERIAL COATING; MATERIALS TESTING; PHOTOLUMINESCENCE; REVIEW; SEMICONDUCTOR; SURFACE CHARGE; CHEMISTRY; LIGHT; QUANTUM THEORY; THEORETICAL MODEL;

LIGHT; MODELS, THEORETICAL; POLYMERS; POLYSTYRENES; QUANTUM THEORY; THIOPHENES;

EID: 79953329224     PISSN: None     EISSN: 14220067     Source Type: Journal    
DOI: 10.3390/ijms12031575     Document Type: Review

References (121)

1. Pope, M.; Kallmann H.; Magnante, P. Electroluminescence in organic crystals. J. Chem. Phys. 1963, 38, 2042-2043.
2. Helfrich, W.; Schneider, W.G. Recombination radiation in anthracene crystal. Phys. Rev. Lett. 1965, 14, 229-231.
3. Tang, C.W.; Vanslyke, S.A. Organic electroluminescent diodes. Appl. Phys. Lett. 1987, 51, 913-915.
4. Adachi, C.; Tsutsui, T.; Saito, S. Organic electroluminescent device having a hole conductor as an emitting layer. Appl. Phys. Lett. 1989, 55, 1489-1491.
5. Burroughes, H.; Bradley, D.D.C.; Brown, A.R.; Marks, R.N.; Mackay, K.; Friend, R.H.; Burns P.L.; Holmes, A.B. Light-emitting diodes based on conjugated polymers. Nature 1990, 347, 539-541.
6. Braun, D.; Heeger, A.J. Visible light emission from semiconducting polymer diodes. Appl. Phys. Lett. 1991, 58, 1982-1984.
7. Friend, R.H.; Gymer, R.W.; Holmes, A.B.; Burroughes, J.H.; Marks, R.N.; Taliani, C.; Bradley, D.D.C.; Dos Santos, D.A.; Bre das, J.L.; LoÈ gdlund, M.; Salaneck, W.R. Electroluminescence in conjugated polymers. Nature 1999, 397, 121-128.
8. Grüner, J.; Cacialli, F.; Friend, R.H. Emission enhancement in single-layered conjugated polymer microcavities. J. Appl. Phys. 1996, 80, 207-215.
9. Almassio, M.S.; Sarimbalis, M.N.; Montani, R.S.; Garay, R.O. Synthesis and characterization of poly(1,4-phenylene vinylene)-co-(2,5-pyridilene vinylene)'s. Polym. Bull. 2005, 54, 163-172.
10. Tang, R.P.; Zhan'ao, T.; Cheng, C.X.; Li, Y.F.; Xi, F. Synthesis, electroluminescence, and photovoltaic properties of dendronized poly(p-phenylene vinylene) derivatives. Polymer 2005, 46, 5341-5350.
11. Mo, Y.Q.; Huang, J.; Jiang, J.X.; Deng, X.Y.; Niu, Y.H.; Cao, Y. Influence of traces of water on the synthesis and electroluminescence properties of poly(2-methoxy, 5-(2'-ethylhexyloxy)-1,4-phenylene vinylene). Chin. J. Polym. Sci. 2002, 20, 461-465.
12. Weinfurtner, K.H.; Fujikawa, H.; Tokito, S.; Taga, Y. Highly efficient pure blue electroluminescence from polyfluorene: Influence of the molecular weight distribution on the aggregation tendency. Appl. Phys. Lett. 2000, 76, 2502-2504.
13. Yu, W.L.; Cao, Y.; Pei, J.A.; Huang, W.; Heeger, A.J. Blue polymer light-emitting diodes from poly(9,9-dihexylfluorene-alt-co-2,5-didecyloxy-para-phenylene). Appl. Phys. Lett. 1999, 75, 3270-3272.
14. Hou, Q.; Xu, Y.S.; Yang, W.; Yuan, M.; Peng, J.B.; Cao, Y. Novel red-emitting fluorene-based copolymers. J. Mater. Chem. 2002, 12, 2887-2892.
15. Millard I.S. High-efficiency polyfluorene polymers suitable for RGB applications. Synth. Met. 2000, 111, 119-123.
16. Hou, Q.; Zhang, Y.; Yang, R.Q.; Yang, W.; Cao, Y. Synthesis and electroluminescent properties of copolymers derived from fluorene and metal-free and Pt (II) tetraphenylporphyrin. Synth. Met. 2005, 153, 193-196.
17. Huang, F.; Niu, Y.H.; Liu, M.S.; Zhou, X.H.; Tian, Y.Q.; Jen, A.K.Y. Efficient ultraviolet-blue polymer light-emitting diodes based on a fluorene-based non-conjugated polymer Appl. Phys. Lett. 2006, 89 081104:1-081104:3.
18. Misaki, M.; Chikamatsu, M.; Yoshida, Y.; Azumi, R.; Tanigaki, N.; Yase, K.; Nagamatsu, S.; Ueda, Y. Highly efficient polarized polymer light-emitting diodes utilizing oriented films of beta-phase poly(9,9-dioctylfluorene). Appl. Phys. Lett. 2008, 93, 243503:1-243503:3.
19. Mo, Y.Q.; Deng, X.Y.; Jiang, X.; Cui, Q.H. Blue electroluminescence from 3,6-Silafluorene-based copolymers. J. Polym. Sci. Part A: Polym. Chem. 2009, 47, 3286-3295.
20. Jin, Y.; Xu, Y.B.; Qiao, Z.; Peng, J.B.; Wang, B.Z.; Cao, D.R. Enhancement of electroluminescence properties of red diketopyrrolopyrrole-doped copolymers by oxadiazole and carbazole units as pendants. Polymer 2010, 51, 5726-5733.
21. Giovanella, U.; Betti, P.; Bolognesi, A.; Destri, S.; Melucci, M.; Pasini, M.; Porzio, W.; Botta, C. Core-type polyfluorene-based copolymers for low-cost light-emitting technologies. Org. Electron. 2010, 11, 2012-2018.
22. Lee, P.I.; Hsu, S.L.C.; Lin, P.Y. White-light-emitting diodes from single polymer systems based on polyfluorene copolymers with quinoxaline derivatives. Macromolecules 2010, 43, 8051-8057.
23. Grimsdale, A.C.; Chan, K.L.; Martin, R.E.; Jokisz, P.G.; Holmes, A.B. Synthesis of lightemitting conjugated polymers for applications in electroluminescent devices. Chem. Rev. 2009, 109, 897-1091.
24. Cao, Y.; Yu, G.; Zhang, C.; Menon, R; Heeger, A.J. Polymer light-emitting diodes with polyethylene dioxythiophene-polystyrene sulfonate as the transparent anode. Synth. Met. 1997, 87, 171-174.
25. Robinson, M.R.; O'Regan, M.B.; Bazan, G.C. Synthesis, morphology and optoelectronic properties of tris[(N-ethylcarbazolyl)(3',5'-hexyloxybenzoyl)methane](phenanthroline)-europium. Chem. Commun. 2000, 17, 1645-1646.
26. Yu, W.L.; Pei, J.; Cao, Y.; Huang, W. Hole-injection enhancement by copper phthalocyanine (CuPc) in blue polymer light-emitting diodes. J. Appl. Phys. 2001, 89, 2343-2350.
27. Harding, M.J.; Poplavskyy, D.; Choong, V.E.; Campbell, A.J.; So, F. Effects of solution-processed polymer interlayers on hole injection and device performance of polymer light-emitting diodes. Org. Electron. 2008, 9, 183-190.
28. Niu, Y.H.; Liu, M.S.; Ka, J.W.; Jen, A.K.Y. Thermally crosslinked hole-transporting layers for cascade hole-injection and effective electron-blocking/exciton-confinement in phosphorescent polymer light-emitting diodes. Appl. Phys. Lett. 2006, 88, 093505:1-093505:3.
29. Kim, J.S.; Friend, R.H.; Grizzi, I.; Burroughes, J.H. Spin-cast thin semiconducting polymer interlayer for improving device efficiency of polymer light-emitting diodes. Appl. Phys. Lett. 2005, 87, 023506:1-023506:3.
30. Niu, Y.H.; Huang, J.; Cao, Y. High-efficiency polymer light-emitting diodes with stable saturated red emission: Use of carbazole-based copolymer blends in a poly(p-phenylenevinylene) derivative. Adv. Mater. 2003, 15, 807-811.
31. Niu, Y.H.; Yang, W.; Cao, Y. High-efficiency blue-light-emitting diodes with narrow linewidth based on blends of poly[2-(2'-ethylhexyloxy)-1,4-phenylene] and poly(dialkylfluorene-codibenzothiophene). Appl. Phys. Lett. 2002, 81, 2884-2886.
32. Ma, W.L.; Iyer, P.K.; Gong, X.; Liu, B.; Moses, D.; Bazan, G.C.; Heeger, A.J. Water/methanolsoluble conjugated copolymer as an electron-transport layer in polymer light-emitting diodes. Adv. Mater. 2005, 17, 274-277.
33. Pope, M.; Swenberg, C.E. Electronic Processes in Organic Crystals and Polymers, 1st ed.; Oxford University Press: New York, NY, USA, 1982.
34. Hayashi, S.; Etoh, H.; Saito, S. Electroluminescence of perylene films with a conducting polymer as an anode. Jpn. J. Appl. Phys. 1986, 25, 773-775.
35. Mu, H.; Li, W.; Jones, R.; Steckl, A.; Klotzkin, D. A comparative study of electrode effects on the electrical and luminescent characteristics of Alq(3)/TPD OLED: Improvements due to conductive polymer (PEDOT) anode. J. Lumin. 2007, 126, 225-229.
36. Yang, Y.; Heeger, A.J. Polyaniline as a transparent electrode for polymer light-emitting diodes: Lower operating voltage and higher efficiency. Appl. Phys. Lett. 1994, 64, 1245-1247.
37. Hung, L.S.; Tang, C.W.; Mason, M.G. Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrode. Appl. Phys. Lett. 1997, 70, 152-154.
38. Yoon, J.; Kim, J.J.; Lee, T.W.; Park, O.O. Evidence of band bending observed by electroabsorption studies in polymer light emitting device with ionomer/Al or LiF/Al cathode. Appl. Phys. Lett. 2000, 76, 2152-2154.
39. Brown, T.M.; Friend, R.H.; Millard, I.S.; Lacey, D.J.; Burroughes, J.H.; Cacialli, F. LiF/Al cathodes and the effect of LiF thickness on the device characteristics and built-in potential of polymer light-emitting diodes. Appl. Phys. Lett. 2000, 77, 3096-3098.
40. Yang, X.; Mo, Y.; Yang, W.; Yu, G.; Cao, Y. Efficient polymer light emitting diodes with metal fluoride Al cathodes. Appl. Phys. Lett. 2001, 79, 563-565.
41. Deng, X.Y.; Tong, S.W.; Hung, L.S.; Mo, Y.Q.; Cao, Y. Role of ultrathin Alq(3) and LiF layers in conjugated polymer light-emitting diodes. Appl. Phys. Lett. 2003, 82, 3104-3106.
42. Xu, Q.F.; Ouyang, J.Y.; Yang, Y. Ultrahigh efficiency green polymer light-emitting diodes by nanoscale interface modification. Appl. Phys. Lett. 2003, 83, 4695-4697.
43. Lee, T.W.; Park, O.O.; Lee, M.D.; Zyung, T.; Ahn, T.; Shim, H.K. Polymer light-emitting devices using ionomers as an electron injecting and hole blocking layer. J. Appl. Phys. 2001, 90, 2128-2134.
44. Cao, Y.; Yu, G.; Heeger, A.J. Efficient, low operating voltage polymer light-emitting diodes with aluminum as the cathode material. Adv. Mater.1998, 10, 917-921.
45. Deng, X.Y.; Lau, W.M.; Wong, K.Y.; Low, K.H.; Chow, H.F.; Cao, Y. High efficiency low operating voltage polymer light-emitting diodes with aluminum cathode. Appl. Phys. Lett. 2004, 84, 3522-3524.
46. Niu, Y.H.; Ma, H.; Xu, Q.M.; Jen, A.K.Y. High-efficiency light-emitting diodes using neutral surfactants and aluminum cathode. Appl. Phys. Lett. 2005, 86, 083504:1-083504:3.
47. Guo, T.F.; Yang, F.S.; Tsai, Z.J. High-performance polymer light-emitting diodes utilizing modified Al cathode. Appl. Phys. Lett. 2005, 87, 013504:1-013504:3.
48. Niu, Y.H.; Jen, A.K.Y.; Shu, C.F. High-efficiency polymer light-emitting diodes using eutral surfactant modified aluminum cathode. J. Phys. Chem. B 2006, 110, 6010-6014.
49. Huang, F.; Niu, Y.H.; Zhang, Y.; Ka, J.W.; Liu, M.S.; Jen, A.K.Y. A conjugated, neutral surfactant as electron-injection material for high-efficiency polymer light-emitting diodes. Adv. Mater. 2007, 19, 2010-2014.
50. Huang, F.; Zhang, Y.; Liu, M.S.; Jen, A.K.Y. Electron-Rich Alcohol-Soluble Neutral Conjugated Polymers as Highly Efficient Electron-Injecting Materials for Polymer Light-Emitting Diodes. Adv. Funct. Mater. 2009, 19, 2457-2466.
51. Yang, R.Q.; Xu, Y.H.; Dang, X.D.; Nguyen, T.Q.; Cao, Y.; Bazan, G.C. Conjugated oligoelectrolyte electron transport/injection layers for organic optoelectronic devices. J. Am. Chem. Soc. 2008, 130, 3282-3283.
52. Huang, F.; Niu, Y.H.; Zhang, Y.; Ka, J.W.; Liu, M.S.; Jen, A.K.Y. A conjugated, neutral surfactant as electron-injection material for high-efficiency polymer light-emitting diodes. Adv. Mater. 2007, 9, 2010-2014.
53. Zeng, W.J.; Wu, H.B.; Zhang, C.; Huang F.; Peng, J.B.; Yang, W.; Cao, Y. Polymer light-emitting diodes with cathodes printed from conducting Ag paste. Adv. Mater. 2007, 19, 810-814.
54. Wu, H.B.; Huang, F.; Mo, Y.Q.; Yang, W.; Wang, D.L.; Peng, J.B.; Cao, Y. Efficient electron injection from a bilayer cathode consisting of aluminum and alcohol-/water-soluble conjugated polymers. Adv. Mater. 2004, 16, 1826-1830.
55. Sze, S.M. Physics of Semiconductor Devices, 2nd ed.; Wiley-Interscience: New York, NY, USA, 1981.
56. Kang, E.T.; Ehrlich, P.; Bhatt, A.P.; Anderson, W.A. Charge carrier generation, transport, and trapping in a photoconductive conjugated polymer: Polyphenylacetylene. Appl. Phys. Lett. 1982, 41, 1136-1138.
57. Emin, D. Semiclassical small-polaron hopping in a generalized molecular-crystal model. Phys. Rev. B 1991, 43, 11720-11724.
58. Bussac, M.N.; Zuppiroli, L. High-field mobility in an assembly of conjugated polymer segments. Phys. Rev. B 1996, 54, 4674-4679.
59. Wang, J.F.; Kawabe, Y.; Shaheen, S.E.; Morrell, M.M.; Jabbour, G.E.; Lee, P.A.; Anderson, J.; Armstrong, N.R.; Kippelen, B.; Mash, E.A.; Peyhambarian, N. Exciplex electroluminescence from organic bilayer devices composed of triphenyldiamine and quinoxaline derivatives. Adv. Mater. 1998, 10, 230-233.
60. Morteani, A.C.; Dhoot, A.S.; Kim, J.S.; Silva, C.; Greenham, N.C.; Murphy, C.; Moons, E.; Cina, C.; Burroughes, J.H.; Friend, R.H. Barrier-free electron-hole capture in polymer blend heterojunction light-emitting diodes. Adv. Mater. 2003, 15, 1708-1712.
61. Bassler, H. Injection, transport and recombination of charge carriers in organic light-emitting diodes. Polym. Adv. Technol. 1998, 9, 402-418.
62. Blom, P.W.M.; de Jong, M.J.M.; Breedijk, S. Temperature dependent electron-hole recombination in polymer light-emitting diodes. Appl. Phys. Lett. 1997, 71, 930-932.
63. Scott, J.C.; Karg, S.; Carter, S.A. Bipolar charge and current distributions in organic light-emitting diodes. J. Appl. Phys. 1997, 82, 1454-1460.
64. Cornil, J.; dos Santos, D.A.; Crispin, X.; Silbey, R.; Brédas, J.L. Influence of Interchain Interactions on the Absorption and Luminescence of Conjugated Oligomers and Polymers: A Quantum-Chemical Characterization. J. Am. Chem. Soc. 1998, 120, 1289-1299.
65. Lemmerc, U.; Ochsea, A.; Deussena, M.; Mahrta, R.F.; Göbela, E.O.; Bässlera, H.; Haring Bolivarb, P.; Wegmannb, G.; Kurzb, H. Energy transfer in molecularly doped conjugated polymers. Synth. Met. 1996, 78, 289-293.
66. Ruseckasa, A.; Theanderc, M.; Valkunasb, L.; Anderssond, M. R.; Inganäsc, O.; Sundström, V. Energy transfer in a conjugated polymer with reduced inter-chain coupling. J. Lumin. 1998, 76, 474-477.
67. Cao, Y.; Parker, I.D.; Yu, G.; Zhang, C.; Heeger, A.J. Improved quantum efficiency for electroluminescence in semiconducting polymers. Nature 1999, 397, 414-417.
68. Shuail, Z.; Beljonne1, D.; Silbey, R.J.; Brédas, J.L. Singlet and Triplet Exciton Formation Rates in Conjugated Polymer Light-Emitting Diodes. Phys. Rev. Lett. 2000, 84, 131-134.
69. Baldo, M.A.; Obrien, D.F.; You, Y.; Shoustikov, A.; Sibley, S.; Thompson, M.E.; Forrest, S.R. Highly efficient phosphorescent emission from organic electroluminescent devices. Nature 1998, 395, 151-154.
70. Cleave, V.M.; Yahioglu, G.; Le Barny, P.; Friend, R.H.; Tessler, N. Harvesting of singlet and triplet energy in polymer LEDs. Adv. Mater. 1999, 11, 285-288.
71. Gong, X.; Robinson, M.R.; Ostrowski, J.C.; Moses, D.; Bazan, G.C.; Heeger, A.J. High-Efficiency Polymer-Based Electrophosphorescent Devices. Adv. Mater. 2002, 14, 581-585.
72. Zhu, W.G.; Mo, Y.Q.; Yuan, M.; Yang, W.; Cao, Y. Highly efficient electrophosphorescent devices based on conjugated polymers doped with iridium complexes. Appl. Phys. Lett. 2002, 80, 2045-2047.
73. Cheng, G.; Fei, T.; Duan, Y.; Zhao, Y.; Ma, Y.G.; Liu, S.Y. Highly efficient white polymer light-emitting devices based on wide bandgap polymer doped with blue and yellow phosphorescent dyes. Opt. Lett. 2010, 35, 2436-2438.
74. Li, A.Y.; Li, Y.Y.; Cai, W.Z.; Zhou, G.J.; Chen, Z.; Wu, H.B.; Wong, W.Y.; Yang W.; Peng, J.B.; Cao, Y. Realization of highly efficient white polymer light-emitting devices via interfacial energy transfer from poly(N-vinylcarbazole). Org. Electron. 2010, 11, 529-534.
75. Liang, B.; Xu, Y.H.; Chen, Z.; Peng, J.B.; Cao, Y. White polymer phosphorescent light-emitting devices with a new yellow-emitting iridium complex doped into polyfluorene. Synth. Met. 2009, 159, 1876-1879.
76. Chen, F.C.; Chien, S.C.; Chen, Y.S. Single-layer triplet white polymer light-emitting diodes incorporating polymer oxides: Effect of charge trapping at phosphorescent dopants. Appl. Phys. Lett. 2009, 94, 043306:1-043306:3.
77. Kim, T.H.; Lee, H.K.; Park, O.O.; Chin, B.D.; Lee, S.H.; Kim, J.K. White-Light-Emitting Diodes Based on Iridium Complexes via Efficient Energy Transfer from a Conjugated Polymer. Adv. Funct. Mater. 2006, 16, 611-617.
78. Xu, Y.H.; Peng, J.B.; Jiang, J.X.; Xu, W.; Yang, W.; Cao, Y. Efficient white-light-emitting diodes based on polymer codoped with two phosphorescent dyes. Appl. Phys. Lett. 2005, 87, 193502:1-193502:3.
79. Chance, R.R.; Prock, A.; Silbey, R. In Advances in Chemical Physics; Prigogine, I., Rice, S.A., Eds.; Wiley-Interscience: New York, NY, USA, 1978; pp. 1-65.
80. Becker, H.; Burns, S.E.; Friend, R.H. Effect of metal films on the photoluminescence and electroluminescence of conjugated polymers. Phys. Rev. B 1997, 56, 1893-1905.
81. Obrien, D.; Bleyer, A.; Lidzey, D.G.; Bradley, D.D.C.; Tsutsui, T. Efficient multilayer electroluminescence devices with poly(m-phenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) as the emissive layer. J. Appl. Phys. 1997, 82, 2662-2670.
82. Lacey, D. High-efficiency polymer light-emitting diodes. In abstracts of the 9th International Workshop on Inorganic and Organic Electroluminesence, Bend, Oregon, USA, September 13-17, 1998.
83. Tsutsui, T.; Takada, N.; Saito, S.; Ogino, E. Sharply directed emission in organic electroluminescent diodes with an optical-microcavity structure. Appl. Phys. Lett. 1994, 65, 1868-1870.
84. Jordan, R.H.; Rothberg, L.J.; Dodabalapur, A.; Slusher, R.E. Efficiency enhancement of microcavity organic light emitting diodes. Appl. Phys. Lett. 1996, 69, 1997-1999.
85. Grüner, J.; Cacialli, F.; Friend, R.H. Emission enhancement in single-layer conjugated polymer microcavities. J. Appl. Phys. 1996, 80, 207-215.
86. Fisher, T.A.; Pate, D.G.M.A.; Weaver, M.S.; Whittaker, D.M.; Skolnick, M.S.; Bradley, D.D.C. Electroluminescence from a conjugated polymer microcavity structure. Appl. Phys. Lett. 1995, 67, 1355-1357.
87. Lemmer, U.; Hennig, R.; Guss, W.; Ochse, A.; Pommerehne, J.; Sander, R.; Greiner, A.; Mahrt, R.F.; Bässler, H.; Feldmann, J.; Göbel, E.O. Microcavity effects in a spin-coated polymer two-layer system. Appl. Phys. Lett. 1995, 66, 1301-1303.
88. Tessler, N.; Denton, G. J.; Friend, R.H. Lasing from conjugated-polymer microcavities. Nature 1996, 382, 695-697.
89. Tessler, N.; Harrison, N.T.; Friend, R.H. High peak brightness polymer light-emitting diodes. Adv. Mater. 1998, 10, 64-68.
90. Lidzey, D.G.; Bradley, D.D.C.; Alvarado, S.F.; Seidler, P.F. Electroluminescence in polymer films, Nature 1997, 386, 135-135.
91. Lu, M.H.; Sturm, J.C. External coupling efficiency in planar organic light-emitting devices. Appl. Phys. Lett. 2001, 78, 1927-1929.
92. Gu, G.; Bulovic, V.; Burrows, P.E.; Forrest, S.R.; Thompson, M.E. Transparent organic light emitting devices. Appl. Phys. Lett. 1996, 68, 2606-2608.
93. Hung, L.S.; Tang, C.W. Interface engineering in preparation of organic surface-emitting diodes. Appl. Phys. Lett. 1999, 74, 3209-3211.
94. Hung, L.S.; Tang, C.W.; Mason, M.G.; Raychaudhuri, P.; Madathil, J. Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes. Appl. Phys. Lett. 2001, 78, 544-546.
95. 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.
96. Chong, L.W.; Chou, Y.N.; Lee, Y.L.; Wen, T.C.; Guo T.F. Hole-injection enhancement of top-emissive polymer light-emitting diodes by P3HT/FNAB modification of Ag anode. Org. Electron. 2009, 10, 1141-1145.
97. Hsieh, S.N.; Kuo, T.Y.; Chong, L.W.; Wen, T.C.; Yang, F.S.; Guo, T.F.; Chung C.T. A Study of Semitransparent Cathodes on the Performance of Top-Emitting Polymer Light-Emitting Diodes. Photonics Technol. Lett. 2009, 21, 109-111.
98. Chuang, T.K.; Troccoli, M.; Kuo, P.C.; Jamshidi-Roudbari, A.; Hatalis, M.K.; Biaggio, I.; Voutsas, A.T. Top-emitting 230 dots/in. active-matrix polymer light-emitting diode displays on flexible metal foil substrates. Appl. Phys. Lett. 2007, 90, 151114:1-151114:3.
99. Deng, X.Y.; Ho, M.K.; Wong, K.Y. Top-emitting polymer light-emitting diodes with environmentally stable cathodes. J. Appl. Phys. 2006, 99, 016103:1-016103:3.
100. Guo, T.F.; Yang, F.S.; Tsai, Z.J.; Wen, T.C.; Hsieh, S.N.; Fu, Y.S.; Chung, C.T. Organic oxide/Al composite cathode in efficient polymer light-emitting diodes. Appl. Phys. Lett. 2006, 88, 113501:1-113501:3.
101. Hou, L.T.; Huang, F.; Zeng, W.J.; Peng, J.B.; Cao, Y. High-efficiency inverted top-emitting polymer light-emitting diodes. Appl. Phys. Lett. 2005, 87, 153509:1-153509:3.
102. Kido, J.; Kimura, M.; Nagai, K. Multilayer White Light-Emitting Organic Electroluminescent Device. Science 1995, 267, 1332-1334.
103. Tasch, S.; Brandstatter, C.; Meghdadi, F.; Leising, G.; Froyer, G.; Athouel, L. Red-green-blue light emission from a thin film electroluminescence device based on parahexaphenyl. Adv. Mater. 1997, 9, 33-36.
104. Dodabalapur, A.; Rothberg, L.J.; Miller, T.M. Electroluminescence from organic semiconductors in patterned microcavities. Electron. Lett. 1994, 30, 1000-1002.
105. Nakamura, A.; Tada, T.; Mizukami, M.; Hirose, S.; Yagyu, S. Three-color polymer lightemitting diodes by stamped dye diffusion. Appl. Phys. Lett. 2002, 80, 2189-2191.
106. Tada, K.; Onoda M. Three-color polymer light-emitting devices patterned by maskless dye diffusion onto prepatterned electrode. Jpn. J. Appl. Phys. Lett. 1999, 38, L1143-L1145.
107. Pschenitzka, F.; Sturm, J.C. Three-color organic light-emitting diodes patterned by masked dye diffusion. Appl. Phys. Lett. 1999, 74, 1913-1915.
108. Niu, Q.L.; Shao, Y.X.; Xu, W.; Wang, L.; Han, S.H.; Liu, N.H.; Peng, J.B.; Cao, Y.; Wang, J. Full color and monochrome passive-matrix polymer light-emitting diodes flat panel displays made with solution processes. Org. Electron. 2008, 9, 95-100.
109. Bharathan, J.; Yang, Y. Polymer electroluminescent devices processed by inkjet printing: I. Polymer light-emitting logo. Appl. Phys. Lett. 1998, 72, 2660-2662.
110. Carter, J.; Lyon, P.; Creighton, C.; Bale, M.; Gregory, H. Developing a Scalable and Adaptable Ink Jet Printing Process for OLED Displays. SID Symp. Dig. 2005, 36, 523.
111. Birnstock, J.; Blassing, J.; Hunze, A.; Scheffel, M.; Stossel, M.; Heuser, K.; Wittmann, G.; Worle, J.; Winnacker, A. Screen-printed passive matrix displays based on light-emitting polymers. Appl. Phys. Lett. 2001, 78, 3905-3907.
112. Pardo, D.A.; Jabbour, G.E.; Peyghambarian, N. Application of screen printing in the fabrication of organic light-emitting devices. Adv. Mater. 2000, 12, 1249-1255.
113. Wang, P.H.; Ho, M.S.; Yang, S.H.; Chen, K.B.; Hsu, C.S. Synthesis of thermal-stable and photo-crosslinkable polyfluorenes for the applications of polymer light-emitting diodes. J. Polym. Sci. Part A: Polym. Chem. 2010, 48, 516-524.
114. Muller, C.D.; Falcou, A.; Reckefuss, N.; Rojahn, M.; Wiederhirn, V.; Rudati, P.; Frohne, H.; Nuyken, O.; Becker, H.; Meerholz, K. Multi-colour organic light-emitting displays by solution processing. Nature 2003, 421, 829-833.
115. Gather, M.C.; Kohnen, A.; Falcou, A.; Becker, H.; Meerholz, K. Solution-processed full-color polymer organic light-emitting diode displays fabricated by direct photolithography. Adv. Funct. Mater. 2007, 17, 191-200.
116. Shirai, S.; Kido, J. Fabrication of multi color polymer EL devices using the photo-bleaching method. J. Photopolym. Sci. Technol. 2001, 14, 317-322.
117. Pogantsch, A.; Trattnig, G.; Langer, G.; Kern, W.; Scherf, U.; Tillmann, H.; Horhold, H.H.; Zojer, E. Multicolor organic electroluminescent devices fabricated by a reductive photo-patterning method. Adv. Mater. 2002, 14, 1722-1725.
118. Deng, X.Y.; Wong, K.Y. Cross-Linked Conjugated Polymers for Achieving Patterned Three-Color and Blue Polymer Light-Emitting Diodes with Multi-Layer Structures. Macromol. Rapid Commun. 2009, 30, 1570-1576.
119. Deng, X.Y.; Wong, K.Y.; Mo, Y.Q. Three-color polymeric light-emitting devices using selective photo-oxidation of multilayered conjugated polymers. Appl. Phys. Lett. 2007, 90, 063505:1-063505:3.
120. Cambridge Display Technology Home Page. Available online: http://www.cdtltd.co.uk (accessed on 10 Febuary 2011).
121. Cambridge Display Technology Status. Available online: http://www.cdtltd.co.uk/technology/status/ (accessed on 10 February 2011).