53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White-Light-Emitting Diodes

Zifei Wang; Fanglong Yuan; Xiaohong Li; Yunchao Li; Haizheng Zhong; Louzhen Fan; Shihe Yang

doi:10.1002/adma.201702910

53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White-Light-Emitting Diodes

Adv Mater. 2017 Oct;29(37). doi: 10.1002/adma.201702910. Epub 2017 Jul 31.

Authors

Zifei Wang¹, Fanglong Yuan¹, Xiaohong Li¹, Yunchao Li¹, Haizheng Zhong², Louzhen Fan¹, Shihe Yang³

Affiliations

¹ Department of Chemistry, Beijing Normal University, Beijing, 100875, China.
² Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
³ Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

PMID: 28758696
DOI: 10.1002/adma.201702910

Abstract

Red emissive carbon quantum dots (R-CQDs) with quantum yield of 53% is successfully prepared. An ultraviolet (UV)-pumped CQD phosphors-based warm white light-emitting diode (WLED) is realized for the first time and achieves a color rendering index of 97. This work provides a new avenue for the exploration of low cost, environment-friendly, and high-performance CQD phosphors-based warm WLEDs.

Keywords: high color rendering index; high quantum yields; red emissive carbon quantum dots; warm white-light-emitting diodes.