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

Literature Information

Publication Date 2016-03-29
DOI 10.1039/C6CP01102K
Impact Factor 3.676
Authors

Chenning Zhang, Tetsuo Uchikoshi, Rong-Jun Xie, Lihong Liu, Yoshio Sakka, Naoto Hirosaki


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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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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