| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High-Efficiency Green Phosphorescent Organic Light-Emitting Diode Based on Simplified Device Structures |
| ZHANG Hong-Mei1,2**, WANG Dan-Bei1, ZENG Wen-Jin1,2, YAN Min-Nan1 |
1Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023
2Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023 |
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| Cite this article: |
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ZHANG Hong-Mei, WANG Dan-Bei, ZENG Wen-Jin et al 2015 Chin. Phys. Lett. 32 097803 |
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Abstract 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 88 cd/A, 22% and 82 cd/A, respectively, at a luminance of 100 and 1000 cd/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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Received: 18 April 2015
Published: 02 October 2015
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| PACS: |
78.60.Fi
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(Electroluminescence)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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