Browsing by Author "Yang, TH"

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    Hydrogen-containing Na3HTi1–xMnxF8 narrow-band phosphor for light-emitting diodes
    (American Chemical Society, 2019-01-16) Fang, MH; Yang, TH; Leśniewski, T; Lee, C; Mahlik, S; Grinberg, M; Peterson, VK; Didier, C; Pang, WK; Su, CC; Liu, RS
    We synthesize the phosphor Na3HTi1–xMnxF8 (Na3HTiF8:Mn4+) material series using a coprecipitation method. We determine the complete phase and crystallographic structure of the Na3HTiF8 series end-member, including the determination of the H atoms at the 4b (0, 1/2, 0) crystallographic site within the Cmcm space group symmetry structure, resulting in a quantum efficiency of ∼44%, which is comparative to the Na2SiF6:Mn4+ phosphor materials. We successfully model the luminescent properties of the Na3HTi1–xMnxF8 material series, including temperature and time-dependent photoluminescence, providing a good prediction of the decay properties at low and high temperature and revealing the existence of Mn5+ during the ionization process. Notably, LED package data indicates that the Na3HTi1–xMnxF8 material series could be a promising candidate for high-level and back-lighting devices. This research reveals the role that hydrogen plays in determining fluoride phosphor structure and properties, revealing a new path for the synthesis of fluoride phosphors. Copyright © 2019 American Chemical Society