Journal
OPTICAL MATERIALS
Volume 48, Issue -, Pages 36-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2015.07.019
Keywords
Red phosphor; ZnSnF6 center dot 6H(2)O; K2SiF6; Hexafluorometallate; White-LED
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [26289085]
- Grants-in-Aid for Scientific Research [26289085] Funding Source: KAKEN
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ZnSnF6 center dot 6H(2)O:Mn4+ red-emitting hexahydrate phosphor is synthesized by the chemical reaction method, and its unique structural and optical properties are investigated using X-ray diffraction measurement, photoluminescence (PL) analysis, PL excitation spectroscopy, and electron spin resonance (ESR) spectroscopy. The Mn4+-activated phosphor exhibits remarkable degradation in the PL intensity under Xe lamp exposure and also by the coherent laser beam irradiation with the following order of degradation: Ar+ (488 nm) > He-Cd (325 nm) > He-Ne laser (632.8 nm). The mechanism of degradation is considered to be due to a change in the valence state of manganese ions from Mn4+ to Mn5+ by the photooxidation and/or disproportionation. The ESR measurement supports decreased Mn4+ spin density in the Xe-lamp exposed, degraded sample. The changes in the structural and PL properties are also observed after thermal annealing above similar to 100 degrees C and explained by the thermal-annealing-induced dehydration/decomposition of the host material. (C) 2015 Elsevier B.V. All rights reserved.
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