量子点发光二极管稳定性提高策略

量子点发光二极管(QLEDs)由于具有独特的光电特性,可应用于照明和显示行业,其外量子效率(EQEs)正迅速接近商业化要求。然而,器件的稳定性和工作寿命仍然是QLEDs商业化应用面临的关键问题。本文将影响QLEDs寿命的主要因素分为功能层材料的稳定性和电荷注入不平衡两大方面,从提高量子点、电荷传输层(CTLs)的稳定性以及促进电荷平衡等方面讨论了近年来提高QLEDs稳定性的各种策略。随着人们对QLEDs降解机制认识的加深,更稳定的量子点和QLEDs器件得以开发,但是将QLEDs器件商业化仍存在很大的挑战,比如Cd的高毒性以及蓝光QLEDs的寿命和效率远低于绿光和红光相对应的水平,此外,QLEDs在高亮度(1000 cd m^-2)下的稳定性较差,这些因素均限制了QLEDs的发展。因此,应进一步加大QLEDs在光电器件领域的研发力度,克服这些技术劣势,实现QLEDs未来的商业化。

Strategies for improving the stability of quantum dots light-emitting diodes

Quantum dot Light-Emitting Diodes(QLEDs)are applied to the lighting and display industry for their unique photoelectric characteristics.Their External Quantum Efficiency(EQEs)is quickly meeting commercial requirements while the device’s lifetime is still one of their biggest challenges.The significant factors affecting the lifetime of QLEDs are divided into two aspects including the stability of the functional layer’s materials and charge imbalance.Various strategies for enhancing QLEDs stability are discussed including improving the stability of quantum dots,implementing Charge Transport Layers(CTLs)and promoting charge balance.With the deepening understanding of the degradation mechanism of QLEDs,more stable quantum dots and QLEDs devices have been developed.However,there are still some obstacles to the commercialization of QLEDs.For example,the high toxicity of Cd and the lifetime and efficiency of blue QLEDs are far lower than the corresponding levels of green and red QLEDs.In addition,the stability of QLEDs at high brightness(1000 cd m?2)is usually much shorter,which still limits the development of QLEDs.Therefore,research and development efforts for QLEDs should be further strengthened to overcome these technical obstacles and achieve the future commercialization of QLEDs.