基于 Zn(x)Cd(1-x)S 量子点的白光发光二极管。

Zn(x)Cd(1-x)S quantum dots-based white light-emitting diodes.

机构信息

Institute of Materials Science and Engineering, National Central University, Taoyuan, Taiwan.

出版信息

Opt Lett. 2013 Jun 15;38(12):2080-2. doi: 10.1364/OL.38.002080.

DOI:10.1364/OL.38.002080

Abstract

In this study, two kinds of colloidal ternary semiconductor white light-emitting quantum dots (WQDs), Zn(0.5)Cd(0.5)S and Zn(0.8)Cd(0.2)S, are prepared and used as nanophosphors in a UV light-emitting diode (UV-LED) pumping device. When the weight ratio of Zn(0.5)Cd(0.5)S WQDs is 9.1 wt. % in silicone and the drive current is set at 20 mA, the chromaticity coordinates (CIE), correlated color temperature (CCT), color rendering index (CRI), and luminous efficiency are (0.43,0.37), 2830 K, 90, and 0.94 lm/W, respectively. On the other hand, under the same weight ratio in silicone, the CIE, CCT, CRI, and luminous efficiency of Zn(0.8)Cd(0.2)S WQDs are (0.36,0.33), 4240 K, 86, and 4.12 lm/W, respectively. Based on the above results, we can conclude that WQDs-based LED can be obtained by controlling the compositions of Zn(x)Cd(1-x)S QDs due to the coexistence of band-edge and surface state emission.

摘要

在这项研究中，制备了两种胶体三元半导体白光发光量子点（WQDs），即 Zn(0.5)Cd(0.5)S 和 Zn(0.8)Cd(0.2)S，并将其用作 UV 发光二极管（UV-LED）泵浦器件中的纳米荧光粉。当 Zn(0.5)Cd(0.5)S WQDs 在硅酮中的重量比为 9.1wt.%，且驱动电流设定为 20mA 时，色度坐标（CIE）、相关色温（CCT）、显色指数（CRI）和光效分别为（0.43,0.37）、2830K、90 和 0.94lm/W。另一方面，在硅酮中相同的重量比下，Zn(0.8)Cd(0.2)S WQDs 的 CIE、CCT、CRI 和光效分别为（0.36,0.33）、4240K、86 和 4.12lm/W。基于上述结果，我们可以得出结论，通过控制 Zn(x)Cd(1-x)S QDs 的组成，可以获得基于 WQDs 的 LED，这是由于带边和表面态发射的共存。