The origin of bimodal luminescence of β-SiAlON:Eu2+ phosphors as revealed by fluorescence microscopy and cathodoluminescence analysis

•Bimodal emission is originated from β-SiAlON grains with z≥2.•Coexistence of two kinds of emission centers in the β-SiAlON phase is definite.•Fluorescence microscopy shows influence of the z value on emission of β-SiAlON. Eu2+-doped SiAlON phosphors with the composition of EuxSi6−zAlzOzN8−z (0.5≤z≤...

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Bibliographic Details
Published in:Materials research bulletin 2014-03, Vol.51, p.205-209
Main Authors: Gan, Lin, Mao, Zhi-Yong, Zeng, Xiong-Hui, Zhang, Yu-Qiang, Zhao, Yang, Xu, Fang-Fang, Zhu, Ying-Chun, Liu, Xue-Jian
Format: Article
Language:English
Subjects:
A. optical materials
C. electron microscopy
D. luminescence
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Summary:•Bimodal emission is originated from β-SiAlON grains with z≥2.•Coexistence of two kinds of emission centers in the β-SiAlON phase is definite.•Fluorescence microscopy shows influence of the z value on emission of β-SiAlON. Eu2+-doped SiAlON phosphors with the composition of EuxSi6−zAlzOzN8−z (0.5≤z≤3) at a fixed x=0.01 were synthesized by the gas pressure sintering method. Dependence of luminescence properties on the phase compositions in β-SiAlON:Eu2+ phosphors has been examined via fluorescence microscope and scanning electron microscope equipped with a cathodoluminescence spectrometer and an energy dispersive spectrometer. Bimodal emission (green and violet) from β-SiAlON phase is observed in the samples with z≥2, indicating co-existence of two different kinds of coordination for Eu2+ ions in the host lattice.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2013.12.018