Spectroscopy and Spectral Analysis, Volume. 39, Issue 1, 39(2019)
Preparation and Photoluminescence Properties of Fluorophosphate Glasses with High Efficient White Light Emission
A series of Sn2+, Dy3+ and Sn2+-Dy3+ co-doped fluorophosphate glasses (FPGs) for white light emitting phosphor have been prepared by the melt quenching method. Under the UV light excitation, FPG: Sn2+ and FPG∶Dy3+ can obtain blue and yellow light, respectively. The emission color of FPG∶Sn2+-Dy3+ can be tuned from blue to white color by properly adjusting the concentration of Dy3+ ions under the excitation of 280 nm UV light, which can be attributed to the energy transfer from Sn2+ to Dy3+ ions. The energy transfer mechanism was investigated and analyzed according to the photoluminescence, lifetime decay and CIE chromaticity coordinate. In addition, the FPG∶Sn2+fluorophosphate glass shows the highest color rendering index of 94 and the quantum efficiency of 81.3%, and the Sn2+-Dy3+ co-doped fluorophosphate glasses show better white color coordinates. By controlling the concentration of Dy3+, the FPGs can present a white light with a CIE chromaticity coordinate of (0.311, 0.330), which is very close to the equal energy point. The corresponding quantum efficiency and the luminance are 56.3% and 6 706 cd·m-2, respectively. The results of this study demonstrate that the FPGs are promising candidate for commercial white light emitting applications.
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ZHENG Jia-jin, LU Qiang, ZHENG Rui-lin, ZOU Hui, YU Ke-han, WEI Wei. Preparation and Photoluminescence Properties of Fluorophosphate Glasses with High Efficient White Light Emission[J]. Spectroscopy and Spectral Analysis, 2019, 39(1): 39
Received: Nov. 12, 2017
Accepted: --
Published Online: Mar. 17, 2019
The Author Email: Jia-jin ZHENG (zhengjj@njupt.edu.cn)