| 光谱学与光谱分析 |
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| Highly Efficient and Chromatic-Stability Yellow Organic Light Emitting Diodes Using Double Ultra Thin Yellow Emissive Layers |
| LU Lin，LIAO Ying-jie，LIU Ji-zhong，WEI Bin*，ZHANG Jian-hua |
| Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, China |
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Abstract The authors investigated the efficiency and chromatic-stability characteristics of organic light emitting devices (OLEDs) with ultra-thin yellow emissive layers of 0.1 nm 5,6,11,12,-tetraphenylnaphthacene (rubrene) and hole block layer of BCP. The OLEDs with double thin rubrene layers and BCP layer were found to exhibit a high luminance and electroluminescence (EL) efficiency. The maximum EL efficiency and luminance reached 6.35 cd·A-1 at 6 V and 7 068 cd·m-2 at 10 V respectively. Moreover, Commission International De L’Eclairage (CIE) coordination maintained unchanged (0.49, 0.49) in the wide range of applied voltages. The enhanced efficiency and good chromatic stability were attributed to a balanced injection and transport of electrons and holes and the expected confinement and balanced recombination of the emission region in the ultra-thin rubrene layers.
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Received: 2009-10-08
Accepted: 2010-01-09
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Corresponding Authors:
WEI Bin
E-mail: bwei@shu.edu.cn
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