【摘要】 量子点发光二极管(QLED)存在高亮度时效率低、高效率下亮度低的问题。如何在高亮度的同时保持高效率、且具有高稳定性,是QLED领域亟需解决的难题,也是制约其在高亮高效显示和照明领域应用的关键技术瓶颈。针对这一挑战,本研究团队通过设计以硒为阴离子贯穿元素的核壳结构量子点(CdSe/ZnSe),优化了发光层能级与传输层能级的匹配,提高了载流子的注入效率和平衡,从而实现了器件整体性能的大幅度提升。在可见光区标志性的红、绿、蓝三基色QLED器件上,获得的最高亮度和外量子效率分别达到356 000、614 000、62 600cd/m~2和21.60%、22.90%、8.05%。在器件稳定性方面,红色和绿色QLED器件的寿命达到160万小时以上,蓝色的寿命达到7 000小时以上,解决了以往QLED在高亮度下低效率、高效率下低亮度的关键难题,首次实现了兼具高亮度高效率的红、绿、蓝QLED器件,原理上展示了QLED在显示与照明两大领域都将大有作为。更多还原

【Abstract】 Quantum dot light-emitting diodes(QLEDs)have a long-standing mutex of high brightness and high efficiency.How to maintain high efficiency and high stability at high brightness is an urgent problem to be solved and also is a key technical bottleneck restricting the QLED’s application in the fields of highefficient display and lighting.To overcome this challenge,we designed a series of core-shell quantum dots(CdSe/ZnSe)with Se throughout the core/shell regions,optimized the matching of energy level between the emitting layer and the transport layer,improved the carrier injection efficiency and balance,and thus achieved a substantial improvement in the overall performance of the device.The maximum EQEs reached up to 21.60%,22.90% and 8.05% for red,green and blue emission QLEDs with corresponding peak brightness of 356 000 cd/m~2,614 000 cd/m~2 and 62 600 cd/m~2,respectively.For the device stability,the operation lifetime of red and green QLEDs reached up to 1.6 million hours,and lifetime of blue QLEDs also achieved 7 000 hours.All the performance of those QLEDs indicated that it solved the key problem of unachievable simultaneous attainment of high brightness and high efficiency QLEDs in the past.Red,green,and blue QLED devices with simultaneous high brightness and efficiency were achieved successfully for the first time,and this demonstrated,in principle,the significant potential applications of QLEDs in fields of display and lighting.更多还原