標題: Multi-layer organic light-emitting diodes processed from solution using phosphorescent dendrimers in a polymer host
作者: Ko, Li-Chun
Liu, Tsung-Yu
Chen, Chun-Yao
Yeh, Chung-Ling
Tseng, Shin-Rong
Chao, Yu-Chiang
Meng, Hsin-Fei
Lo, Shih-Chun
Burn, Paul L.
Horng, Sheng-Fu
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
關鍵字: Dendrimer;Blade coating;Organic light-emitting diodes
公開日期: 1-Jun-2010
摘要: A uniform dispersion of highly soluble phosphorescent dendrimer emitters is achieved by blending with a polymer host poly(9-vinylcarbazole) (PVK) containing N,N'-diphenyl-N, N'-(bis(3-methylphenyl)-[1,1-biphenyl]-4,4'-diamine (TPD) and 2-(4-biphen-4'-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). No visible aggregation or self-quenching was observed for guest-to-host weight ratios of up to 33:67. The dendrimers contain a fac-tris(2-phenylpyridyl)iridium(III) [Ir(ppy)(3)] core, first generation biphenyl-based dendrons, and 2-ethylhexyloxy surface groups. The guest-host blend is used for all solution processed organic light-emitting diodes. A maximum external and current efficiency of 10.2% and 38 cd/A (at 5 V and a brightness of 50 cd/m(2)), and a maximum brightness of 27,000 cd/m(2) (at 14.5 V), were obtained when a CsF/Al cathode was used. Blade coating was used to fabricate a multi-layer structure that also contained an electron-transport layer. The device that had a LiF/Al cathode had a maximal efficiency of 40 cd/A corresponding to an external quantum efficiency of 10.8% (at 5 V and a brightness of 19 cd/m(2)). The maximum brightness of the second device was 17,840 cd/m(2) at 14 V. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2010.03.014
http://hdl.handle.net/11536/5369
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2010.03.014
期刊: ORGANIC ELECTRONICS
Volume: 11
Issue: 6
起始頁: 1005
結束頁: 1009
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