Achieving Highly Efficient Fluorescent Blue Organic Light‐Emitting Diodes Through Optimizing Molecular Structures and Device Configuration
Achieving Highly Efficient Fluorescent Blue Organic Light‐Emitting Diodes Through Optimizing Molecular Structures and Device Configuration
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DOI：
10.1002/adfm.201002165
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发表时间：
2011-02
影响因子：
19
通讯作者：
Changgua Zhen;Yanrong Dai;Wenjing Zeng;Zhu Ma;Zhi-Kuan Chen;J. Kieffer
中科院分区：
文献类型：
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作者：
Changgua Zhen;Yanrong Dai;Wenjing Zeng;Zhu Ma;Zhi-Kuan Chen;J. Kieffer
基于蓝光发光材料电子性质的第一性原理计算结果，通过引入吸电子基团来优化低聚芴的分子结构，以平衡有机发光二极管（OLED）的空穴和电子注入和传输。结果是未掺杂器件的最大外量子效率（EQE）从2.0%显着提高到4.99%。进一步优化设备配置和处理过程，例如，通过改变发射层的厚度并通过热退火处理，导致未掺杂的天蓝色器件的最大EQE非常高，为7.40%。最后，通过在合适的主体材料4，4 '-双（咔唑-9-基）联苯（CBP）中以6%的最佳浓度掺杂发射体，实现了具有9.40%的极高最大EQE和（0.147，0.139）的国际照明委员会（CIE）坐标的纯蓝色发射。
Based on the results of first‐principles calculations of the electronic properties of blue light‐emitting materials, the molecular structures of oligofluorenes are optimized by incorporating electron‐withdrawing groups into the molecules to balance hole and electron injection and transport for organic light‐emitting diodes (OLEDs). The result is a remarkable improvement in the maximum external quantum efficiency (EQE) of the undoped device from 2.0% to 4.99%. Further optimization of the device configurations and processing procedures, e.g., by changing the thickness of the emitting layer and through thermal annealing treatments, leads to a very high maximum EQE of 7.40% for the undoped sky‐blue device. Finally, by doping the emitter in a suitable host material, 4,4’‐bis(carbazol‐9‐yl)biphenyl (CBP), at the optimal concentration of 6%, pure blue emission with extremely high maximum EQE of 9.40% and Commission Internationale de l’Eclairage (CIE) coordinates of (0.147, 0.139) is achieved.