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

Chen Wei; Wang Kai; Hao Junjie; Wu Dan; Qin Jing; Dong Di; Deng Jian; Li Yiwen; Chen Yulong; Cao Wanqiang

doi:10.1515/nanoph-2016-0037

Nanophotonics (Sep 2016)

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

Chen Wei,
Wang Kai,
Hao Junjie,
Wu Dan,
Qin Jing,
Dong Di,
Deng Jian,
Li Yiwen,
Chen Yulong,
Cao Wanqiang

Affiliations

Chen Wei: Shenzhen Key Laboratory of 3rd Generation Semiconductor Devices (SUSTC), Shenzhen, 518055, China
Wang Kai: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Hao Junjie: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Wu Dan: School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
Qin Jing: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Dong Di: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Deng Jian: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Li Yiwen: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Chen Yulong: Department of Electrical and Electronic Engineering, South University of Science and Technology of China, Shenzhen 518055, China
Cao Wanqiang: School of Materials Science and Engineering, Hubei University, Wuhan 430062, China

DOI: https://doi.org/10.1515/nanoph-2016-0037
Journal volume & issue: Vol. 5, no. 4
pp. 565 – 572

Abstract

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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.

Published in Nanophotonics

ISSN: 2192-8606 (Print); 2192-8614 (Online)
Publisher: De Gruyter
Country of publisher: Germany
LCC subjects: Science: Physics
Website: https://www.degruyter.com/journal/key/nanoph/html#submit

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