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...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。展开更多
Light-emitting diodes(LEDs)are changing the energy and lighting industry due to their high power efficiencies,low energy consumption,and long operational lifetimes.While epitaxiallygrown LEDs are the current industry ...Light-emitting diodes(LEDs)are changing the energy and lighting industry due to their high power efficiencies,low energy consumption,and long operational lifetimes.While epitaxiallygrown LEDs are the current industry standard,their incompatibility with large-area displays and flexible substrates precludes their use in many applications.Solution-processed light-emitting materials are more versatile and can be easily coated onto a variety of substrates using modern deposition techniques such as vapor deposition,spin-coating,dip-coating,and spray-painting.With these advantages,organic light-emitting diodes(OLEDs)have been widely applied to TVs,cell phones,and semi-transparent displays.They,however,suffer from resolution-transparency trade-off and incompatibility with high-temperature processes.Quantum dot(QD)light-emitting diodes(QLEDs)have sharper emission features and higher stabilities.However,QD emitting layers also have low mobilities,and thus the devices require large voltages for operation due to the presence of surface organic ligands.展开更多
文摘量子点发光二极管(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。
基金supported by the National Key Research and Development Program of China(2020YFA0309300)the Natural Science Foundation of Tianjin(20JCZDJC00560 and 20JCJQJC00210)+2 种基金the National Natural Science Foundation of China(NSFC,11974191 and 12127803)the 111 Project(B07013)the“Fundamental Research Funds for the Central Universities”,Nankai University(91923139,63213040,C029211101,C02922101,and ZB22000104)。
基金the National Natural Science Foundation of China(21905316)the Sun Yat-sen University.J.Tang thanks the financial support from the Major State Basic Research Development Program of China(2016YFB0700702)+2 种基金the National Natural Science Foundation of China(51761145048 and 61725401)L.Ding thanks the National Key Research and Development Program of China(2017YFA0206600)the National Natural Science Foundation of China(51773045,21772030,51922032 and 21961160720)for the financial support.
文摘Light-emitting diodes(LEDs)are changing the energy and lighting industry due to their high power efficiencies,low energy consumption,and long operational lifetimes.While epitaxiallygrown LEDs are the current industry standard,their incompatibility with large-area displays and flexible substrates precludes their use in many applications.Solution-processed light-emitting materials are more versatile and can be easily coated onto a variety of substrates using modern deposition techniques such as vapor deposition,spin-coating,dip-coating,and spray-painting.With these advantages,organic light-emitting diodes(OLEDs)have been widely applied to TVs,cell phones,and semi-transparent displays.They,however,suffer from resolution-transparency trade-off and incompatibility with high-temperature processes.Quantum dot(QD)light-emitting diodes(QLEDs)have sharper emission features and higher stabilities.However,QD emitting layers also have low mobilities,and thus the devices require large voltages for operation due to the presence of surface organic ligands.
