Prevention of thermal- and moisture-induced degradation of the photoluminescence properties of the Sr2Si5N8:Eu2+ red phosphor by thermal post-treatment in N2–H2
文献信息
Chenning Zhang, Tetsuo Uchikoshi, Rong-Jun Xie, Lihong Liu, Yoshio Sakka, Naoto Hirosaki
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.
期刊推荐

Russian Journal of General Chemistry

Chemical Communications

Russian Journal of Organic Chemistry

Chemistry Education Research and Practice

New Journal of Chemistry

Russian Journal of Bioorganic Chemistry

Saudi Pharmaceutical Journal

Organic Process Research & Development

Nature Medicine

Russian Journal of Applied Chemistry
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Physical Chemistry Chemical Physics

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