Effect of triplet multiple quantum well structures on the performance of blue phosphorescent organic light-emitting diodes

被引：0

作者：

Lee, Seokjae ^{[2
]}

Koo, Jaryong ^{[2
]}

Hyung, Gunwoo ^{[2
]}

Lim, Donghwan ^{[2
]}

Lee, Donghyung ^{[2
]}

Lee, Kumhee ^{[1
]}

Yoon, Seungsoo ^{[1
]}

Kim, Wooyoung ^{[3
]}

Kim, Youngkwan ^{[2
]}

机构：

[1] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea

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

[3] Hoseo Univ, Sch Display Engn, Asan 336795, South Korea

来源：

NANOSCALE RESEARCH LETTERS | 2012年 / 7卷

关键词：

DEVICES; ELECTROPHOSPHORESCENCE; LAYER;

D O I：

10.1186/1556-276X-7-23

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We investigate multiple quantum well [MQW] structures with charge control layers [CCLs] to produce highly efficient blue phosphorescent organic light-emitting diodes [PHOLEDs]. Four types of devices from one to four quantum wells are fabricated following the number of CCLs which are mixed p-and n-type materials, maintaining the thickness of the emitting layer [EML]. Remarkably, such PHOLED with an optimized triplet MQW structure achieves maximum luminous and external quantum efficiency values of 19.95 cd/A and 10.05%, respectively. We attribute this improvement to the efficient triplet exciton confinement effect and the suppression of triplet-triplet annihilation which occurs within each EML. It also shows a reduction in the turn-on voltage from 3.5 V ( reference device) to 2.5 V by the bipolar property of the CCLs.

引用

页数：5