Enhanced cathodoluminescence of green β-sialon:Eu2+ phosphor by In2O3 coating

Journal article (2017)

Authors

Yujie Zhao Xiamen University
Rong Jun Xie National Institute for Materials Science, Xiamen University
B.F.P.R. Dierre RST/Fundamental Aspects of Materials and Energy - AS
Takashi Takeda National Institute for Materials Science
Takashi Sekiguchi National Institute for Materials Science
Naoto Hirosaki National Institute for Materials Science
Le Wang China Jiliang University
Research Group
ChemE/Product and Process Engineering (AS) (TU Delft)
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Published Date

2017

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Product and Process Engineering

Abstract

The β-sialon:Eu2+ phosphor has superior luminescent properties as an excellent green down-conversion material for white light-emitting diodes. To take advantage of its high chromaticity and apply it to field emission displays (FEDs), the drawback of its electron insulation that impedes the electron transmission when excited by e-beam needs to be solved. In this work, a facile method was adopted to coat conductive In2O3 on the surface of β-sialon:Eu2+ phosphor, and the influence of In2O3 coating on the cathodoluminescent properties was investigated. The results show that the In2O3 coating contributes to charge elimination and significantly improves the cathodoluminescence (CL) of β-sialon:Eu2+. Under 19 kV/1.0 nA e-beam excitation, the In2O3 coated sample shows CL intensity about four times higher than that of the uncoated β-sialon:Eu2+. Moreover, no luminescence saturation occurs in coated β-sialon:Eu2+, indicating that the In2O3-coated β-sialon:Eu2+ would be a promising green emissive material for full-color FEDs.

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