High Efficiency and Color Rendering Quantum Dots White Light Emitting Diodes Optimized by Luminescent Microspheres Incorporating

Nanophotonics

article

Wei Chen¹  Wanqiang Cao²  Kai Wang³  Junjie Hao³  Dan Wu⁴  Jing Qin³  Di Dong³  Jian Deng³  Yiwen Li³  Yulong Chen³ 

[1] Shenzhen Key Laboratory of 3rd Generation Semiconductor Devices (SUSTC);School of Materials Science and Engineering, Hubei University;Department of Electrical and Electronic Engineering, South University of Science and Technology of China;School of Electrical and Electronic Engineering, Nanyang Technological University

关键词: light emitting diodes;    quantum dots;    luminescent microspheres;    color rendering index;   

DOI  :  10.1515/nanoph-2016-0037

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

In this research, we have developed an approach by incorporating quantum dots (QDs) with red emission into mesoporous silica microspheres through a non-chemical process and obtained luminescent microspheres (LMS). Owing to the lattice structure of LMS, QDs were effectively protected from intrinsic aggregation in matrix and surface deterioration by encapsulant, oxygen and moisture. The LMS composite has therefore maintained large extent luminescent properties of QDs, espe-cially for the high quantum efficiency. Moreover, the fabricated white light emitting diode (WLED) utilizing LMS and YAG:Ce yellow phosphor has demonstrated excellent light performance with color coordinates around (x = 0.33, y = 0.33), correlated color temperature between 5100 and 5500 K and color rendering index of Ra = 90, R9 = 95. The luminous efficiency of the WLED has reached up to a new record of 142.5 lm/W at 20 mA. LMS provide a promising way to practically apply QDs in lightings and displays with high efficiency as well as high stability.

【 授权许可】

CC BY