Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7905978 | Optical Materials | 2018 | 6 Pages |
Abstract
High quantum efficiencies CaLaMgM1-xO6:xMn4+ (Mâ¯=â¯Nb, Ta; 0â¯<â¯xâ¯â¤â¯0.006) phosphors are prepared by a solid-state reaction method, and their crystal structure and luminescence property are investigated. The excitation spectra of CaLaMgM1-xO6:Mn4+ revealed two excitation bands at 250-450â¯nm and 450-600â¯nm corresponding to 4A2 â 4T1 and 4A2 â 4T2 transition of Mn4+ ions respectively, and emission spectra cover from 650 to 800â¯nm with the strongest emission peak at 710â¯nm owing to the 4E â 4A2 transition of Mn4+ ions. The optimal Mn4+ doping concentrations for both of CaLaMgNbO6 and CaLaMgTaO6 host are determined to be 0.004â¯mol. The PL intensity and quantum efficiencies of the entitled phosphors excited under related UV light are investigated and compared with that of K2TiF6:Mn4+, Y2O3:Eu3+, CaAlSiN3:Eu2+ phosphors. Finally, a bright red LED was fabricated by using a 365â¯nm UV chip with the as-prepared CaLaMgNbO6:Mn4+ phosphor.
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Authors
Guangxiang Jiang, Bobo Yang, Guoying Zhao, Yufeng Liu, Jun Zou, Hongtao Sun, Haiyan Ou, Yongzheng Fang, Jingshan Hou,