Issue 47, 2015

A dual-emitting core–shell carbon dot–silica–phosphor composite for white light emission

Abstract

A unique dual-emitting core–shell carbon dot–silica–phosphor (CDSP) was constructed from carbon dots (CDs), tetraethoxysilane (TEOS) and Sr2Si5N8:Eu2+ phosphor through a one-pot sol–gel method. Blue emitting CDs uniformly disperse in the silica layer covering the orange emitting phosphor via a polymerization process, which makes CDSP achieve even white light emission. Tunable photoluminescence of CDSP is observed and the preferable white light emission is achieved through changing the excitation wavelength or controlling the mass ratio of the phosphor. When CDSP powders with a phosphor rate of 3.9% and 5.1% are excited at a wavelength of 400 nm, preferable white light emission is observed, with Commission Internationale de l'Eclairage (CIE) coordinates of (0.32, 0.32) and (0.34, 0.32), respectively. Furthermore, CDSP can mix well with epoxy resin to emit strong and even white light, and based on this, a CDSP-based white LED with a high colour rendering index (CRI) of 94 was fabricated.

Graphical abstract: A dual-emitting core–shell carbon dot–silica–phosphor composite for white light emission

Supplementary files

Article information

Article type
Paper
Submitted
19 Aug 2015
Accepted
04 Nov 2015
First published
05 Nov 2015

Nanoscale, 2015,7, 20142-20148

A dual-emitting core–shell carbon dot–silica–phosphor composite for white light emission

Y. Chen, B. Lei, M. Zheng, H. Zhang, J. Zhuang and Y. Liu, Nanoscale, 2015, 7, 20142 DOI: 10.1039/C5NR05637C

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