基于CsPbBr_(3)钙钛矿量子点的白光LED器件的电流稳定性研究  

Research on Current Stability of White LED Devices Based on CsPbBr_(3)Perovskite Quantum Dots

作　　者：殷录桥[1,2] 张豆豆 王胜 严宇贤 张建华 Yin Luqiao;Zhang Doudou;Wang Sheng;Yan Yuxian;Zhang Jianhua(School of Mechatronic and Engineering and Automation,Shanghai University,Shanghai 200072,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory of Advanced Display and System Applications,Ministry of Education,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学机电工程与自动化学院,上海200072 [2]上海大学材料科学与工程学院,上海200444 [3]上海大学新型显示技术及应用集成教育部重点实验室,上海200072

出　　处：《光学学报》2021年第19期192-199,共8页Acta Optica Sinica

基　　金：国家自然科学基金(51725505,51605272);上海市科委项目(20010500100)。

摘　　要：大多数针对CsPbBr_(3)钙钛矿量子点的应用研究主要集中于绿光发射的LED,应用于WLED的报道较少,为此对基于CsPbBr_(3)钙钛矿量子点的白光LED器件的电流稳定性进行研究。首先通过热注入法制备CsPbBr_(3)钙钛矿量子点并测试其吸收光谱和发射光谱,吸收峰和发射峰分别为502 nm和512 nm。然后将CsPbBr_(3)钙钛矿量子点与紫外光固化胶混合形成CsPbBr_(3)钙钛矿量子点胶体,叠加红色荧光粉制作两种不同封装结构的白色发光二极管(WLED),分别为WLEDⅠ和WLEDⅡ。在10 mA的电流下,WLEDⅠ的显色指数达到92.1,相关色温为4323 K,流明效率为33.04 lm/W,三个指标均高于WLEDⅡ。最后分别对WLEDⅠ和WLEDⅡ进行电流稳定性测试。在将驱动电流从10 mA慢慢增加到150 mA以及在720 min的通电时间和15 mA的驱动电流两种条件下,分别测试两种WLED器件的性能。结果表明,WLEDⅠ显示出更稳定的变化趋势。Most studies on the application of CsPbBr_(3)perovskite quantum dots mainly focus on LED with green light emission, while few reports are applied to WLED. Therefore, the current stability of white LED devices based on CsPbBr_(3)perovskite quantum dots is studied. First, CsPbBr_(3)perovskite quantum dots are prepared by thermal injection method and their absorption and emission spectra are tested. The absorption and emission peaks are 502 nm and 512 nm, respectively. Then the CsPbBr_(3)perovskite quantum dots are mixed with ultraviolet-curable adhesive to form a CsPbBr_(3)perovskite quantum dot colloid, and red phosphors are superimposed to make two white light-emitting diodes(WLEDs) with different packaging structures, WLED Ⅰ and WLED Ⅱ. Under a current of 10 mA, WLED Ⅰ has a color rendering index of 92.1, a correlated color temperature of 4323 K, and a lumen efficiency of 33.04 lm/W. All three indicators are higher than WLED Ⅱ. Finally, WLED Ⅰ and WLED Ⅱ are tested for current stability. The performances of the two WLED devices are tested under the conditions of slowly increasing the drive current from 10 mA to 150 mA, switching time of 720 min and driving current of 15 mA. The results show that WLED Ⅰ shows a more stable trend of change.

关 键 词：光学器件 CsPbBr_(3) 钙钛矿量子点 白色发光二极管 显色指数 电流稳定性 

分 类 号：O436[机械工程—光学工程]