Electroluminescence from two new ruthenium(II) complexes as phosphorescent dopant: Positive effect of swallow-tail bipyridyl ligand

详细信息	查看全文 | 推荐本文 |

• 作者：Ilker Oner^a ; ^{onerilker@gmail.com} ; Cigdem Sahin^b ; ^{cigdemsahin82@gmail.com} ; Canan Varlikli^a ; ^{canan.varlikli@ege.edu.tr}
• 关键词：Amphiphilic ruthenium (II) complex ; Chiral alkyl chain ; Swallow-tail alkyl chain ; Organic light emitting diode ; Orange-red ; Electroluminescence
• 刊名：Dyes and Pigments
• 出版年：2012
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：October, 2012
• 卷：95
• 期：1
• 页码：23-32
• 文件大小：1646 K

摘要

Two new orange-red emitting ruthenium complexes, [Ru(bpy)2(4,4鈥?bis(3-ethylheptyl)-2,2鈥?bipyridine)](PF₆)₂ and [Ru(bpy)2(4-dihexylmethyl-4鈥?heptyl-2,2鈥?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鈥?heptyl-2,2鈥?bipyridine ligand 1.0聽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聽cd/A, and a maximum brightness of 3824聽cd/m² with an electroluminescence spectral peak at 600聽nm and Commission Internationale de L鈥橢clairage 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鈥?bis(3-ethylheptyl)-2,2鈥?bipyridine) ligand in a device.