作者: Yu Wei , Xinxin Han , Enhai Song , Qinyuan Zhang
DOI: 10.1016/J.MATERRESBULL.2019.01.022
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摘要: Abstract Mn2+ activated phosphors are vital for lighting and displays, whereas the multivalent states characteristics of Mn made that reducing atmosphere (such as H2, CO, H2/N2) is generally required in synthesis processes. Herein, a doped silicate green phosphor Na2ZnSiO4:Mn2+ was synthesized by an unconventional self-reduction Mn7+/Mn4+/Mn3+ to under air atmosphere. Upon 260 nm excitation, intense photoluminescence band centered at 515 nm phosphorescence after stoppage excitation source can be observed this phosphor. The properties, processes mechanism Na2ZnSiO4:Mn, well phase transformations different sources (MnCO3, Mn2O3, MnO2) various temperatures were investigated systematically. Based on these investigations, together with density functional theory (DFT) calculations, based zinc vacancies V Z n ' has been proposed. This work provides not only new luminescent material, but also insights into valence controlling luminescence tuning.