High-Efficiency Green Phosphorescent Organic Light-Emitting Diode Based on Simplified Device Structures

A high-efficiency green phosphorescent organic light emitting diode with a simplified structure is achieved that is free of a hole transport layer. The design of this kind of device structure not only saves the consumption of organic materials but also greatly reduces the structural heterogeneities...

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Bibliographic Details
Published inChinese physics letters Vol. 32; no. 9; pp. 140 - 144
Main Author 张宏梅 王丹蓓 曾文进 闫敏楠
Format Journal Article
LanguageEnglish
Published 01.09.2015
Subjects
Current efficiency
Devices
Luminance
Organic light emitting diodes
Phosphorescence
Stability
Transport
器件结构
基础
外量子效率
有机发光二极管
磷光
空穴传输层
装置结构
载流子注入
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/9/097803

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Summary:A high-efficiency green phosphorescent organic light emitting diode with a simplified structure is achieved that is free of a hole transport layer. The design of this kind of device structure not only saves the consumption of organic materials but also greatly reduces the structural heterogeneities and effectively facilitates the charge injection into the emissive layer. The resulting green phosphorescent organic light-emitting diodes （PHOLEDs） exhibit higher electroluminescent efficiency. The maximum external quantum efficiency and current efficiency reach 23.7% and 88 cd/A, respectively. Moreover the device demonstrates satisfactory stability, keeping 23.7% and 88cd/A, 22% and 82cd/A, respectively, at a luminance of 100 and 1000cd/m2. The working mechanism for achieving high efficiency based on such a simple device structure is discussed correspondingly. The improved charge carrier injection and transport balance are proved to prominently contribute to achieve the high efficiency and great stability at high luminance in the green PHOLEDs.
Bibliography:ZHANG Hong-Mei, WANG Dan-Bei, ZENG Wen-Jin, YAN Min-Nan （1.Key Laboratory for Organic Electronics and Information Displays ＆ Institute of Advanced Nanjing University of Posts ＆ Telecommunications, Nanjing 210023 2 Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing University Telecommunications, Nanjing 210023 Materials of Posts）
11-1959/O4
A high-efficiency green phosphorescent organic light emitting diode with a simplified structure is achieved that is free of a hole transport layer. The design of this kind of device structure not only saves the consumption of organic materials but also greatly reduces the structural heterogeneities and effectively facilitates the charge injection into the emissive layer. The resulting green phosphorescent organic light-emitting diodes （PHOLEDs） exhibit higher electroluminescent efficiency. The maximum external quantum efficiency and current efficiency reach 23.7% and 88 cd/A, respectively. Moreover the device demonstrates satisfactory stability, keeping 23.7% and 88cd/A, 22% and 82cd/A, respectively, at a luminance of 100 and 1000cd/m2. The working mechanism for achieving high efficiency based on such a simple device structure is discussed correspondingly. The improved charge carrier injection and transport balance are proved to prominently contribute to achieve the high efficiency and great stability at high luminance in the green PHOLEDs.
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/9/097803