Polymer light-emitting diode performance

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M.M. Alam, and S.A. Jenekhe, Polybenzobisazoles as efficient electron-transport materials for improving the performance and stability of polymer light-emitting diodes, Chem. Mater., 14 4775-4780, 2002. 

L. Ding, F.E. Karasz, Z. Lin, M. Zheng, L. Liao, and Y. Pang, Effect of Forster energy transfer and hole transport layer on performance of polymer light-emitting diodes, Macromolecules, 34 9183-9188,2001. 

X. Gong, D. Moses, A.J. Heeger, S. Liu, and A.K.-Y. Jen, High-performance polymer light-emitting diodes fabricated with a polymer hole injection layer, Appl. Phys. Lett., 83 183-185 (2003). 

Y Noh, C Lee, J Kim, and K Yase, Energy transfer and device performance in phosphorescent dye doped polymer light emitting diodes, J. Chem. Phys., 118 2853-2864, 2003. 

The aim of this chapter is to present a simple but general band structure picture of the metal-semiconductor interface and compare that with the characteristics of the metal-conjugated polymer interface. The discussion is focused on the polymer light emitting diode (LED) for which the metal-polymer contacts play a central role in the performance of the device. The metal-polymer interface also applies to other polymer electronic devices that have been fabricated, e.g., the thin-film field-effect transistor3, but the role of the metal-polymer interface is much less cruical in this case and... 

J. Liu, Y. Shi, L. Ma, Y. Yang, Device performance and polymer morphology in polymer light emitting diodes The control of device electrical properties and metal/polymer contact, J. Appl. Phys. 88 (2000) 605-609. 

Keywords Device performance Electron-transport moiety Hole-transport moiety Polyfluorenes Polymer light-emitting diode... 

Subsequently, Cao et al. [30,31] designed and synthesized polymer 20-22 by similar method and the highly efficient saturated red-phosphorescent polymer light-emitting diodes (PLEDs) were achieved on the basis of copolymer 20. The best device performances are observed with an external quantum efficiency of 6.5% photon/electron (ph/el) at the current density of 38 mA/cm2, with the emission peak at 630 nm (x = 0.65, y = 0.31) and the luminance of 926 cd/m2. 

Deeper insight into CNT functionalities when used as a dopant for polymer solar cells and polymer light-emitting diodes (PLEDs) was presented by Xu et al. [329]. While the PLED gained from rather low CNT doping levels of about 0.02%, the solar cell performance increased further up to 0.2 wt %. The improved EQE of the OLED was explained by a better charge carrier injection from the electrode, whereas for the solar cell exciton dissociation is facilitated by the nanotubes [329]. 

T. -F. Guo et al., High performance polymer light-emitting diodes fabricated by a low temperature lamination process, Adv. Funct. Mater., 11, 339, 2001. 

F. C. Chen, Y. Yang, M. E. Thompson, and J. Kido. High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex. . dpp/. Phys. Lett., 80(13) 2308-2310, April 2002. 

G. Wantz, L. Hirsch, N. Huby, L. Vignau, J. F. Silvain, A. S. Barriere, and J. P. Pameix. Correlation between the indium tin oxide morphology and the performances of polymer light-emitting diodes. Thin Solid Films, 485 (l-2) 247-251, August 2005. 

The electroluminescent performance of single-layer polymer light-emitting diodes with their emissive layer of PVK and electron transporting molecules of iridium(III)[bis(4,6-difluorophenyl)-pyridinato-N,C ]-picolinate has been investigated [84]. 

Bharathan, J.M., and Y. Yang. 1998. Polymer/metal interfaces and the performance of polymer light-emitting diodes. / Appl Phys 84 3207-3211. 

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