有机添加剂在金属卤化钙钛矿发光二极管中的应用
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摘要
近年来,金属卤化钙钛矿凭借其优异的光电特性以及可低成本溶液加工的优势得到了学界的广泛关注,成为了光电子领域的研究热点,其中,钙钛矿发光二极管是该领域的一大重要研究方向.由于钙钛矿材料具有荧光量子效率高、带隙连续可调、发光半峰宽窄等优点,钙钛矿发光二极管在短短5年时间内,实现了外量子效率从不足1%到超过20%的重大突破,成为了发展速度最快的发光技术.在这5年的发展历程中,学界主要集中于解决如何实现钙钛矿成膜和结晶过程的控制、如何提高钙钛矿薄膜的荧光量子效率,以及如何改善钙钛矿发光二极管的稳定性等问题.而在众多解决方案中,有机添加剂的使用被认为是一种简单且有效的策略.本文通过文献综述,回顾了有机添加剂在钙钛矿发光二极管领域的整体发展和应用情况,并着重讨论了小分子与聚合物添加剂在钙钛矿中的具体作用,最后分析了当前钙钛矿发光二极管面临的问题,并对其未来发展进行了展望.
In recent years, metal halide perovskites have received extensive attention due to their superior optoelectronic properties and solution processability, which also become a research hotspot in the field of optoelectronics. Among all the perovskite optoelectronics applications, perovskite light-emitting diode(LED)becomes one of the important research topics because it is likely to be used in the next-generation display technique. Based on the high photoluminescence quantum yield(PLQY), facilely tunable bandgaps, and sharp emission of perovskite material, the external quantum efficiency of perovskite LED has increased from less than 1% to over 20% within only five years, showing the most rapid development speed in the LED field. During the 5-year exploration of perovskite LEDs, researchers have focused their efforts on how to realize the crystalgrowth control in the perovskite film formation process, enhance PLQY of the perovskite films, and improve the performance of perovskite LEDs. Among all the approaches, the utilization of organic additives including small molecules and polymers proves to be an effective strategy. Here, in this article, we review the recent advances in metal halide perovskite LEDs based on the strategy of organic-additive treatment. We also analyze and discuss the interaction between organic additive and perovskite crystal as well as its influence on the performance of perovskite LED. In the end, we discuss the challenges remaining in perovskite LEDs and the prospects for perovskite LEDs.
In recent years, metal halide perovskites have received extensive attention due to their superior optoelectronic properties and solution processability, which also become a research hotspot in the field of optoelectronics. Among all the perovskite optoelectronics applications, perovskite light-emitting diode(LED)becomes one of the important research topics because it is likely to be used in the next-generation display technique. Based on the high photoluminescence quantum yield(PLQY), facilely tunable bandgaps, and sharp emission of perovskite material, the external quantum efficiency of perovskite LED has increased from less than 1% to over 20% within only five years, showing the most rapid development speed in the LED field. During the 5-year exploration of perovskite LEDs, researchers have focused their efforts on how to realize the crystalgrowth control in the perovskite film formation process, enhance PLQY of the perovskite films, and improve the performance of perovskite LEDs. Among all the approaches, the utilization of organic additives including small molecules and polymers proves to be an effective strategy. Here, in this article, we review the recent advances in metal halide perovskite LEDs based on the strategy of organic-additive treatment. We also analyze and discuss the interaction between organic additive and perovskite crystal as well as its influence on the performance of perovskite LED. In the end, we discuss the challenges remaining in perovskite LEDs and the prospects for perovskite LEDs.
引文
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