標題: Highly branched green phosphorescent tris-cyclometalated iridium(III) complexes for solution-processed organic light-emitting diodes
作者: Huang, Wei-Sheng
Lin, Chia-Wei
Lin, Jiann T.
Huang, Jen-Hsien
Chu, Chih-Wei
Wu, Ying-Hsien
Lin, Hong-Cheu
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Iridium complexes;Dendrimers;Phosphorescence;Organic light-emitting diodes
公開日期: 1-Jul-2009
摘要: A series benzoimidazole-based dendritric complexes of iridium dendrimers containing Frechet-type dendrons with peripheral fluorenyl surface groups have been synthesized. These iridium dendrimers are green-emitting with high phosphorescence quantum yield, and can be spin-coated as films of good quality. From cyclic voltammograms (CV), high onset potentials at 1.42-1.58 V due to the peripheral fluorene group were observed. Device from a second generation dendrimer 17 with structure of ITO/PEDOT:PSS/CBP: 20 wt% 17/TPBI/LiF/Al (PEDOT:PSS = poly(ethylene dioxythiophene): polystyrenesulfonate and CBP = bis(N-carbazolyl)biphenyl) has the best performance: maximum external quantum efficiency of 13.58% and maximum current efficiency of 45.7 cd/A. Space-charge-limited current (SCLC) flow technique was used to measure the mobility of charge carriers in the blend films of the compounds in CBP. Blend films of higher generation dendrimers have lower hole mobility, albeit with higher device efficiencies. (C) 2009 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2009.02.022
http://hdl.handle.net/11536/7065
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2009.02.022
期刊: ORGANIC ELECTRONICS
Volume: 10
Issue: 4
起始頁: 594
結束頁: 606
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