Issue 80, 2016

Effect of Y3+ on the local structure and luminescent properties of La3−xYxSi6N11:Ce3+ phosphors for high power LED lighting

Abstract

A series of Ce3+-activated La3−xYxSi6N11 yellow phosphors were synthesized by high temperature solid-state reaction; their structures and luminescent properties were systematically investigated. The results of structural and spectral characterization showed that with the increase of Y3+ replacing La3+ in La3−xYxSi6N11:Ce3+ (0 < x ≤ 0.9), the space group remains P4bm but with Y3+ occupying two crystallographic sites in different ratio, while the emission spectra exhibit a red-shift from 535 nm to 552 nm. Moreover, the thermal quenching properties of La2.86−xYxSi6N11:0.14Ce3+ exhibit somewhat of a decrease with the increase of x value, but still remains at 95% (x = 0.9) of the initial emission intensity measured at 200 °C. In addition, the light quality is significantly improved by direct packaging with a blue LED chip. The above results indicate that La3−xYxSi6N11:Ce3+ may be a promising phosphor for high power white-light LEDs.

Graphical abstract: Effect of Y3+ on the local structure and luminescent properties of La3−xYxSi6N11:Ce3+ phosphors for high power LED lighting

Supplementary files

Article information

Article type
Paper
Submitted
20 Jul 2016
Accepted
08 Aug 2016
First published
09 Aug 2016

RSC Adv., 2016,6, 77059-77065

Effect of Y3+ on the local structure and luminescent properties of La3−xYxSi6N11:Ce3+ phosphors for high power LED lighting

F. Du, W. Zhuang, R. Liu, Y. Liu, J. Zhong, W. Gao, K. Chen, L. Chen, K. Kato and K. Lin, RSC Adv., 2016, 6, 77059 DOI: 10.1039/C6RA18460J

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