Journal
DYES AND PIGMENTS
Volume 95, Issue 1, Pages 23-32Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2012.02.017
Keywords
Amphiphilic ruthenium (II) complex; Chiral alkyl chain; Swallow-tail alkyl chain; Organic light emitting diode; Orange-red; Electroluminescence
Funding
- EAE Lighting Company
- Ege University
- State Planning Organization of Turkey (DPT)
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Two new orange-red emitting ruthenium complexes, [Ru(bpy)2(4,4'-bis(3-ethylheptyl)-2,2'-bipyridine)](PF6)(2) and [Ru(bpy)2(4-dihexylmethyl-4'-heptyl-2,2'-bipyridine)](PF6)(2) with branched alkyl side groups on the bipyridyl ligand have been synthesized and used as dopants in an organic light emitting device. The device that contains the complex containing the 4-dihexylmethyl-4'-heptyl-2,2'-bipyridine ligand 1.0 wt.% doped polymer blends of poly(vinylcarbazole) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazol as the emitting layer reached to a luminous efficiency of 7 cd/A, and a maximum brightness of 3824 cd/m(2) with an electroluminescence spectral peak at 600 nm and Commission Internationale de L'Eclairage chromaticity coordinates of (0.57, 0.39). The swallow-tail alkyl substituent in this complex played a significant role in lowering the tendency to aggregate and presenting a better electroluminescence efficiency than that of the complex derived from the 4,4'-bis(3-ethylheptyl)-2,2'-bipyridine) ligand in a device. (C) 2012 Elsevier Ltd. All rights reserved.
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