Issue 2, 2017

Color tunable emission and energy transfer in LaSi3N5:Ce3+,Tb3+ phosphors for UV white LEDs

Abstract

A series of new blue-green emitting LaSi3N5:Ce3+,Tb3+ phosphors were obtained through a high temperature solid-state method. The crystal structure, photoluminescence properties and energy transfer from Ce3+ to Tb3+ were investigated. The doped ions Ce3+ and Tb3+ were confirmed to occupy the same crystallographic sites as La3+ using a Rietveld structure refinement method. The emission spectra of these phosphors was composed of a blue emission band attributed to the d–f transition of Ce3+, together with several sharp lines ascribed to the emission of Tb3+ under UV light excitation. Thus a color tunable emission from blue to green was obtained via controlling the doping concentration of Tb3+. In addition, the mechanism of energy transfer, efficiency of energy transfer, chromaticity coordinates and thermal stability of these phosphors were investigated. The results indicated that the Ce3+,Tb3+ co-activated LaSi3N5 phosphors with color-tunable blue-green emission and high quantum efficiency may have potential for UV white LEDs.

Graphical abstract: Color tunable emission and energy transfer in LaSi3N5:Ce3+,Tb3+ phosphors for UV white LEDs

Supplementary files

Article information

Article type
Paper
Submitted
28 Қаз. 2016
Accepted
29 Қар. 2016
First published
04 Қаң. 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 1075-1081

Color tunable emission and energy transfer in LaSi3N5:Ce3+,Tb3+ phosphors for UV white LEDs

F. Du, W. Zhuang, R. Liu, Y. Liu, J. Zhong, P. Gao, X. Zhang, W. Gao and L. Shao, RSC Adv., 2017, 7, 1075 DOI: 10.1039/C6RA25915D

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