| High-Efficiency Saturated Red Bilayer Light-Emitting Diodes： Comparative Studies with Devices from Blend of the Same Light-Emitting Polymers |
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| 引用本文： | 章勇,侯琼,莫越奇,彭俊彪,曹镛.High-Efficiency Saturated Red Bilayer Light-Emitting Diodes： Comparative Studies with Devices from Blend of the Same Light-Emitting Polymers[J].中国物理快报,2006,23(4):1015-1018. |
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| 作者姓名： | 章勇 侯琼 莫越奇 彭俊彪 曹镛 |
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| 作者单位： | [1]Institute of Polymer Optoelectronie Material and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou 510640 [2]Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631 [3]Department of Chemistry, South China Normal University, Guangzhou 510631 |
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| 基金项目： | Supported by the National Key Basic Research and Development Programme of China under Grant No 2002CB613405, and the National Natural Science Foundation of China under Grant No 50433030. |
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| 摘 要： | High-efficient saturated red light-emitting diodes are realized based on a bilayer of phenyl-substituted poly p- phenylene vinylene] derivative （P-PPV） and copolymer （PFO-DBT15） of 9,9-dioctylfluorene （DOFF） and 4,7-di- 2-thienyl-2,1,3-benzothiadiazole （DBT）. External electrolurninescent （EL） quantum efficiency of PFO-DBT15 is increased from 1.6% for a single-layer device to 4.7% for the bilayer device by insertion of a P-PPV layer between PEDOT （polyethylene dioxythiophene-polystyrene sulfonic acid） and PFFO-DBT15 at the current density of 35 mA/cm^2. The luminescence efficiency reaches 0.83 cd/A, and the Commission Internationale de PEelairage coordinates （CIE） become nearly x = 0.700 and y = 0.300. In comparison with the devices from PFFO-DBT15 and P-PPV blend films, the P-PPV/PFO-DBT15 bilayer device shows higher EL quantum efficiency and better stability under high current density, The improved device performance can be attributed to the charge-confinement effect at the interface of the P-PPV/PFO-DBT15 bilayer structure.
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| 关 键 词： | 发光二极管 渗透红色双分子层 发光聚合物 高效率 量子效应 |
| 收稿时间： | 2005-12-29 |
| 修稿时间： | 2005-12-29 |
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