Red phosphorescent iridium complex containing carbazole-functionalized β-diketonate for highly efficient nondoped organic light-emitting diodes
Red phosphorescent iridium complex containing carbazole-functionalized β-diketonate for highly efficient nondoped organic light-emitting diodes
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DOI：
10.1002/adfm.200600099
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发表时间：
2006-07-21
影响因子：
19
通讯作者：
Huang, Chunhui
中科院分区：
文献类型：
--
作者：
Liu, Zhiwei;Guan, Min;Huang, Chunhui
设计、合成并合成了一种新型红色磷光铱配合物，含有咔唑官能化的β-二酮化合物Ir(DBQ)(2)(CBDK)（双(二苯并[f,h]喹喔啉-N,C-2)铱(1-(咔唑-9-基)-5,5-二甲基己烷-2,4-二酮化合物)) 特点。使用标题配合物作为发射体的非掺杂器件的电致磷光特性，器件配置为氧化铟锡 (ITO)/N,N'-二苯基-N,N'-双(1-萘基)-1,1'-二苯基-4,4'-二胺 (NPB; 20 nm)/铱配合物 (20 nm）/2,9-二甲基-4,7-二苯基-1,10-菲咯啉（BCP；5 nm）/三（8-羟基喹啉）（Al2O3；30 nm）/Mg0.9Ag0.1（200 nm）/Ag（80 nm）进行检查。结果表明，非掺杂器件的最大流明效率高达3.49 lm W-1。为了理解观察到的这一优异结果，使用了两个参考配合物 Ir(DBQ)(2)(acac)（其中 acac 是乙酰丙酮酸根阴离子）和 Ir(DBQ)(2)(FBDK)，[双(二苯并[f,h]喹喔啉-N,C-2) 铱 还合成了(1-(9-甲基-芴-9-基)-6,6-二甲基庚烷-3,5-二酮)]，并且作为发射体在相同的装置配置下对它们进行了检查。前一种化合物的最大流明效率为0.26 lm W-1，而后者的最大流明效率为0.37 lm W-4，这表明Ir(DBQ)(2)(CBDK)的优异性能主要归因于改善的空穴传输特性，有利于激子传输。此外，庞大的二酮基团将发射体中心彼此分开，这对于有机发光二极管也很重要。
A novel red phosphorescent iridium, complex containing a carbazole-functionalized beta-diketonate, Ir(DBQ)(2)(CBDK) (bis(dibenzo[f,h]quinoxalinato-N, C-2) iridium (1-(carbazol-9-yl)-5,5-dimethylhexane-2,4-diketonate)) is designed, synthesized, and characterized. The electrophosphorescence properties of a nondoped device using the title complex as an emitter with a device configuration of indium tin oxide (ITO)/N,N'-diphenyl-N,N'-bis(1-naphthyl)-1,1'-diphenyl-4,4'-diamine (NPB; 20 nm)/iridium complex (20 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP; 5 nm)/tris(8-hydroxyquinoline) (AlO; 30 nm)/ Mg0.9Ag0.1 (200 nm)/Ag (80 nm) are examined. The results show that the nondoped device achieves a maximum lumen efficiency as high as 3.49 lm W-1. To understand this excellent result observed, two reference complexes Ir(DBQ)(2)(acac), where acac is the acetyl acetonate anion, and Ir(DBQ)(2)(FBDK), [bis(dibenzo[f,h]quinoxalinato-N,C-2) iridium (1-(9-methyl-fluoren-9-yl)-6,6-dimethylheptane-3,5-diketonate)], have also been synthesized, and as emitters they were examined under the same device configuration. The maximum lumen efficiency of the former compound is found to be 0.26 lm W-1 while that for the latter is 0.37 lm W-4, suggesting that the excellent performance of Ir(DBQ)(2)(CBDK) can be attributed mainly to an improved hole-transporting property that benefits the exciton transport. In addition, a bulky diketonate group separates the emitter centers from each other, which is also important for organic light-emitting diodes.