Issue 18, 2016

Prevention of thermal- and moisture-induced degradation of the photoluminescence properties of the Sr2Si5N8:Eu2+ red phosphor by thermal post-treatment in N2–H2

Abstract

A red phosphor of Sr2Si5N8:Eu2+ powder was synthesized by a solid state reaction. The synthesized phosphor was thermally post-treated in an inert and reductive N2–H2 mixed-gas atmosphere at 300–1200 °C. The main phase of the resultant phosphor was identified as Sr2Si5N8. A passivation layer of ∼0.2 μm thickness was formed around the phosphor surface via thermal treatment. Moreover, two different luminescence centers of Eu(SrI) and Eu(SrII) in the synthesized Sr2Si5N8:Eu2+ phosphor were proposed to be responsible for 620 nm and 670 nm emissions, respectively. More interestingly, thermal- and moisture-induced degradation of PL intensity was effectively reduced by the formation of a passivation layer around the phosphor surface, that is, the relative PL intensity recovered 99.8% of the initial intensity even after encountering thermal degradation; both moisture-induced degraded external and internal QEs were merely 1% of the initial QEs. The formed surface layer was concluded to primarily prevent the Eu2+ activator from being oxidized, based on the systemic analysis of the mechanisms of thermal- and moisture-induced degradation.

Graphical abstract: Prevention of thermal- and moisture-induced degradation of the photoluminescence properties of the Sr2Si5N8:Eu2+ red phosphor by thermal post-treatment in N2–H2

Supplementary files

Article information

Article type
Paper
Submitted
18 Feb 2016
Accepted
27 Mar 2016
First published
29 Mar 2016

Phys. Chem. Chem. Phys., 2016,18, 12494-12504

Prevention of thermal- and moisture-induced degradation of the photoluminescence properties of the Sr2Si5N8:Eu2+ red phosphor by thermal post-treatment in N2–H2

C. Zhang, T. Uchikoshi, R. Xie, L. Liu, Y. Cho, Y. Sakka, N. Hirosaki and T. Sekiguchi, Phys. Chem. Chem. Phys., 2016, 18, 12494 DOI: 10.1039/C6CP01102K

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