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    • Orange-Red-emitting Ca9Gd(PO4)7:Eu3+ Phosphors: Judd-Ofelt Analysis and Investigation on the Thermal Stability, Quantum Efficiency for WLED
    Authors: Luu, Thi Ha Thu; Nguyen, Tu; Dao, Duc Anh; Do, Quang Trung; Manh Trung, Tran; Tran, Thi Quynh Nhu; Nguyen, Thi Huyen; Nguyen, Van Quang; Nguyen, Duy Hung; Dao, Xuan Viet; Nguyen, Duc Trung Kien; Pham, Thanh Huy;  Advisor: -;  Co-Author: - (2021)

    Orange-red-emitting Eu3+-doped Ca9Gd(PO4)7 phosphors have been obtained by a sol-gel technique. These phosphors, excited by UV (270 nm) and near UV light (394 nm), emit orange-red light in the range of 580–710 nm. The Ca9Gd(PO4)7:7 mol% Eu3+ phosphor annealed at 1100 °C shows the highest PL intensity. Judd-Ofelt analysis reveals that the neighbor surroundings of Eu3+ ions are asymmetric, and the lowest asymmetry value is found at the dopant ratio of 7 mol%. The optimal phosphor excited by the wavelength of 394 nm displays an excellent thermal stability (∼76.4 % at 160 °C) with an activation energy of 0.163 eV. The corresponding CIE chromaticity coordinates (x; y) and color purity are ...