摘要
随着光电信息产业的高速发展,发光二极管(LEDs)作为固态照明和显示设备的核心单元,受到了研究人员的广泛关注。根据驱动方式的不同,一般将LEDs分为恒压或直流驱动的LEDs(DC-LEDs)以及交流驱动的LEDs(AC-LEDs)。与DC-LEDs相比,AC-LEDs不仅可以避免载流子大量累积所导致的亮度和效率降低,并且无需变压与整流系统即可接入交流电系统中,大幅简化了器件集成工艺,因此AC-LEDs展现出更好的应用前景。基于此,本文介绍了AC-LEDs的发光机制,总结了包括双绝缘、单绝缘、双注入、串联和平行结构在内的几种常见结构类型;综述了各类AC-LEDs的研究进展,探讨了各种结构对器件性能的影响,发现器件内部载流子的传输平衡和绝缘层的高介电性质是实现AC-LEDs高性能的关键因素;本文最后探讨了AC-LEDs所面临的机遇与挑战。
With the rapid development of the optoelectronic information industry,light-emitting diodes(LEDs)as the core unit of solid-state lighting and display equipment,have been widely concerned by researchers.According to the different driving modes,LEDs can be generally divided into constant voltage or direct current driven LEDs(DC-LEDs)and alternating current driven LEDs(AC-LEDs).Compared to DC-LEDs,AC-LEDs can effectively avoid the charge accumulation for the improved device efficiency and operational lifetime.In addition,AC-LEDs can be readily connected to AC power systems without voltage transformation and rectification systems,which greatly simplifies the device integration process with better practical application prospects.This review firstly introduces the light-emitting mechanism of AC-LEDs and summarizes several AC-LED device structures including double-insulation,single-insulation,double-injection,tandem and parallel structures.Then,the recent advances of various AC-LEDs are presented and the influences of various factors on device performance are discussed.It is found that the balanced carrier transport and the high dielectric properties of insulator are two key factors in achieving high-performance AC-LEDs.Finally,the opportunities and challenges for the future development of AC-LEDs are discussed.
作者
潘飞
戴一仲
李明光
陈润锋
PAN Fei;DAI Yi-zhong;LI Ming-guang;CHEN Run-feng(Key Laboratory for Organic Electronics and Information Display, Jiangsu Key Laboratory for Biosensors,Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing University of Posts & Telecommunications, Nanjing 210023, China)
出处
《液晶与显示》
CAS
CSCD
北大核心
2021年第1期21-38,共18页
Chinese Journal of Liquid Crystals and Displays
基金
国家自然科学基金(No.61704089,No.61875090,No.21674049)。
关键词
交流驱动
有机发光二极管
绝缘层
载流子产生
频率
alternating current
organic light-emitting diodes
insulator
carrier generation
frequency
