王树峰
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王树峰
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论文成果
Sub‐Second Long Lifetime Triplet Exciton Reservoir for Highly Efficient and Stable Organic Light‐Emitting Diode
发布时间：2024-07-29点击次数：
影响因子：
0.0
DOI码：
10.1002/adma.202313746
发表刊物：
Advanced Materials
摘要：
In organic light-emitting diode (OLED), achieving high efficiency requires effective triplet exciton confinement by carrier-transporting materials, which typically have higher triplet energy (ET) than the emitter, leading to poor stability. Here, an electron-transporting material (ETM), whose ET is 0.32 eV lower than that ofthe emitter is reported. In devices, it surprisingly exhibits strong confinement effect and generates excellent efficiency. Additionally, the device operational lifetime is 4.9 times longer than the device with a standard ETM, 1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl) phenyl (whose ET 0.36 eV is higher than the emitter). This anomalous finding is ascribed to the exceptionally long triplet state lifetime (≈0.2 s) ofthe ETM. It is named as long-lifetime triplet exciton reservoir effect. The systematic analysis reveals that the long triplet lifetime ofETM can compensate the requirement for high ET with the help ofendothermic energy transfer. Such combination oflow ET and long lifetime provides equivalent exciton confinement effect and high molecular stability simultaneously. It offers a novel molecular design paradigm for breaking the dilemma between high efficiency and prolonged operational lifetime in OLEDs.
论文类型：
期刊论文
卷号：
36
期号：
21
页面范围：
2313746
是否译文：
否
发表时间：
2024-02-09
收录刊物：
SCI