Solution Processed Red Phosphorescent Organic Light-Emitting Diodes with Green Phosphorescent Ir Sensitizer

被引：1

作者：

Seo, Ji Hyun ^{[1
]}

Choi, Eun Young ^{[1
]}

Kim, Hoe Min ^{[1
]}

Kim, Young Kwan ^{[1
]}

Kim, Seul Ong ^{[2
]}

Lee, Kum Hee ^{[2
]}

Yoon, Seung Soo ^{[2
]}

Je, Jong-Tae ^{[3
]}

机构：

[1] Hongik Univ, Dept Informat Display, Seoul 121791, South Korea

[2] Sungkyunkwan Univ, Suwon, South Korea

[3] SFC Co Ltd, Chungbuk, South Korea

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2011年 / 538卷

关键词：

Cascade energy transfer; organic light-emitting diode; sensitizer; CYCLOMETALATED IRIDIUM COMPLEXES; DEVICES;

D O I：

10.1080/15421406.2011.563657

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We fabricated the organic light-emitting diodes (OLEDs) with sensitizer by solution process. The addition of sensitizer into the emission layer improved the device efficiency. 4,4'-N,N'-dicarbazole-biphenyl (CBP), bis(2-phenylquinoline) iridium(III) (acetylacetonate) [Ir(pq)(2)(acac)], tris(2-phenylpyridine) iridium [Ir(ppy)(3)] were used as host, red emitting dopant, and sensitizer, respectively. The sensitizer leads to the cascade energy transfer from the host into the red emitting dopant. The doping concentration of sensitizer was varied as 0 similar to 20 wt% and optimized. As a result, the device with 5% Ir(ppy)(3) shows the luminous efficiency, power efficiency, and quantum efficiency of 5.1 cd/A, 4.0 lm/W, and 3.0%, respectively. These efficiencies are about 3 times as high as that of device without sensitizer.

引用

页码：91 / 97

页数：7

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