Multi-layer organic light-emitting diodes processed from solution using phosphorescent dendrimers in a polymer host

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. and Horng, Sheng-Fu (2010) Multi-layer organic light-emitting diodes processed from solution using phosphorescent dendrimers in a polymer host. Organic Electronics, 11 6: 1005-1009. doi:10.1016/j.orgel.2010.03.014


Author 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
Title Multi-layer organic light-emitting diodes processed from solution using phosphorescent dendrimers in a polymer host
Journal name Organic Electronics   Check publisher's open access policy
ISSN 1566-1199
1878-5530
Publication date 2010-06
Sub-type Article (original research)
DOI 10.1016/j.orgel.2010.03.014
Volume 11
Issue 6
Start page 1005
End page 1009
Total pages 5
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV, North-Holland
Collection year 2011
Language eng
Formatted abstract
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/m2), and a maximum brightness of 27,000 cd/m2 (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/m2). The maximum brightness of the second device was 17,840 cd/m2 at 14 V.
Copyright © 2010 Elsevier B.V. All rights reserved.
Keyword Dendrimer
Blade coating
Organic light-emitting diodes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
Official 2011 Collection
School of Chemistry and Molecular Biosciences
 
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Created: Sun, 06 Jun 2010, 00:02:30 EST