標題: Novel dendritic light-emitting materials containing polyhedral oligomeric silsesquioxanes core
作者: Chen, Kuei-Bai
Chang, Yueh-Ping
Yang, Sheng-Hsiung
Hsu, Chain-Shu
應用化學系
Department of Applied Chemistry
關鍵字: photoluminescence;optoelectronic devices;organic semiconductors
公開日期: 30-Aug-2006
摘要: A new series of star-like light-emitting materials (POSS1, POSS2 and POSS3) were synthesized by hydrosilylation of the polyhedral oligomeric silsesquioxane with 4,4'-bis(4-(di-(4-methylphenyl)amino)styryl)-2-(hexan-1-yloxy)-5-(10-undecen-1-yloxy)benzene (Cl), 4,4'-bis [(E)-2-(N-ethylcarbazoyl)ethenyl]-2-(hexan-1-yloxy)-5-(10-undecen-1-yloxy)benzene (C2), and Iridium(III) bis(2-phenylpyridine-C-2-N') (13-teradecenyl acetonate) (0), respectively. All synthesized materials are soluble in common organic solvents, such as chloroform, toluene and 1,2dichloroethane, and exhibit good film-forming properties. Therefore, they can be used to fabricate devices by spin-coating. The aggregation of peripheral chromophores can be prevented by the rigid POSS core. A double-layer, light-emitting diode with the configuration of indium-tin oxide/poly(ethylene 3,4-dioxythiophene)/POSS1/Ca/Al was fabricated using POSS1 as the active layer. The device emitted green light with a maximum brightness of 115 cd/m(2) and a current yield of 0.07 cd/A. When the light-emitting layer is blended with 0.8% electron-transport material, 2-(4'-tert-butylphenyl)-5-(4'-diphenyl)-1,3,4-oxadiazole, the maximum brightness and current yield of the device can reach 1469 cd/m(2) and 0.8 cd/A, respectively. The performance of a POSS2 device with the same device structure can reach 1102 cd/m(2) and 0.88 cd/A. POSS3 is a kind of triplet material and blended with 4,4-NN-dicarbazole-biphenyl as host material, to fabricate the light-emitting device. The maximum brightness and current yield reach 1008 cd/m(2) and 1.04 cd/A, respectively. Blending with 1,3,5-tris(2-N-phenylbenzimi dazolyl)benzene as the hole-blocking, material yields a maximum brightness and current yield of 1172 cd/m(2) and 3.99 cd/A. (c) 2006 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.tsf.2006.02.059
http://hdl.handle.net/11536/11902
ISSN: 0040-6090
DOI: 10.1016/j.tsf.2006.02.059
期刊: THIN SOLID FILMS
Volume: 514
Issue: 1-2
起始頁: 103
結束頁: 109
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