基于CuInS₂/ZnS核壳结构量子点的高光效暖白光LED

基于CuInS 2 /ZnS核壳结构量子点的高光效暖白光LED Warm White LED with High Luminous Efficiency Based on CuInS 2 /ZnS Core/Shell Quantum Dots 艾哲 AI Zhe first-author 倪帅帅 NI Shuai-shuai 张亚非 ZHANG Ya-fei 上海交通大学电子信息与电气工程学院 薄膜与微细加工技术教育部重点实验室 上海,200240 上海交通大学电子信息与电气工程学院 薄膜与微细加工技术教育部重点实验室 上海,200240 Key Laboratory for Thin Film and Microfabrication Technology, Ministry of Education, School of Electronic Information and Electrical Engineering, Shanghai Jiaotong University Key Laboratory for Thin Film and Microfabrication Technology, Ministry of Education, School of Electronic Information and Electrical Engineering, Shanghai Jiaotong University 采用逐步热注射法合成了用于白光LED的CuInS 2 /ZnS(CIS/ZnS)核壳结构量子点.通过调整Cu/In的比率, 在CuInS 2 (CIS)量子点的基础上, 合成了发射波长在570~650 nm之间可调的CIS/ZnS量子点.与CIS量子点的低量子产率相比, 具有核壳结构的CIS/ZnS量子点的量子产率达到了78%.通过在黄光荧光粉YAG :Ce 3+ 表面旋涂CIS/ZnS量子点的方式制备了暖白光LED器件.在工作电流为10 mA时, 暖白光LED的发光效率达到了244.58 lm/W.由于CIS/ZnS量子点的加入, 所制备的白光LED器件的显色指数达到86.7且发光颜色向暖色调发生了转移, 相应的色坐标为(0.340 6, 0.369 0). A stepwise hot-injection method was proposed to synthesize CuInS 2 /ZnS (CIS/ZnS) core/shell quantum dots. Based on CIS quantum dots, the emission bands of the prepared CIS/ZnS quantum dots can be tuned from 570 to 650 nm by varying Cu/In ratio. Compared to the low quantum yields of CIS quantum dots, the quantum yields of CIS/ZnS core/shell quantum dots can reach 78%. The white LEDs with warm tone were successfully obtained via spin-coating CIS/ZnS quantum dots on the yellow phosphor YAG :Ce 3+ . The experimental results indicate that the white LEDs possess high luminous efficiency of 244.58 lm/W under 10 mA current density. As a result of joining CIS/ZnS quantum dots, the prepared white LEDs display higher color rendering index (CRI) of about 82.7 and warm white light with a correlated CIE parameters of (0.340 6, 0.369 0). CuInS 2 /ZnS 核壳结构量子点 可调 暖白光 CuInS 2 /ZnS core/shell quantum dots tunable warm white light Arzu C, Ren L F, Wei N J, et al. 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