2019. Yu Zhibin and others in Yunnan Normal University have prepared Cr3+ doped Mg2BeAl6O12 luminescent materials by high temperature solid-state method and sol-gel method. The optimum ignition temperature of the prepared samples is 1500 degree and 1300 degree. When the Cr3+ doping concentration is 1%, the emission peak intensity reaches the strongest, the best doping concentration of Cr3+, also known as the fluorescence quenching temperature.<BR>2018, Feng Jingchun and others of Nanchang Aeronautical University have synthesized Gd2Nb2TiO10:Ln3+ solid solution Phosphors by sol-gel method. The phosphor is composed of spherical particles with a diameter of 335-570nm. The luminescent color of the phosphor can be controlled by adjusting the doping concentration and proportion of Tm3 + and Eu3 +.<BR>In 2018, Wang Qi and others from Jiangxi University of science and technology obtained the energy transfer in the process of Mn4 + / RE3 + CO doping re2bti O6 from the experimental principle analysis of spectrum and fluorescence. The gd2zntio6 phosphor samples Co doped with Mn4 + / Er3 + were prepared by high temperature solid state method. The 1529 nm upconversion NIR emission of Er3 + sensitized by Mn4 + can be seen at 335 nm. The upconversion dark red emission of Er3 + sensitized Mn4 + ions at 705 nm was observed under 980 nm excitation. In addition, the energy transfer principle between Er3 + and manganese ions was also analyzed.<BR>
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