Spherical cerium-doped yttrium aluminum garnet (YAG:Ce³⁺) phosphor particles can achieve both higher packing densities and lower scattering of light, and thus make it possible to obtain excellent white-light-emitting diode performance. In this study, monodisperse YAG:Ce³⁺ microspheres have been synthesized through a fast epoxide-driven sol–gel route and subsequent heat treatment under a reducing atmosphere. The spherical morphology was mainly influenced by the phase separation and gelation process, which could be controlled by the ratio of water/ethanol. Pluronic F127 was introduced into the sol–gel system to control the size of the YAG:Ce³⁺ microspheres, which significantly increased the luminescence intensity of the YAG:Ce³⁺ microspheres. The luminescence quantum yield of the 6 mol% Ce³⁺ ion doped YAG microspheres was measured to be more than 90%, which was as high as that of commercial YAG:Ce³⁺ phosphors. This approach may be readily applied to prepare a broad range of rare earth doped microspheres, implying a new route for the preparation of LEDs phosphors with regular shape and high quantum yield.

中文翻译：

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通过环氧化物驱动的溶胶-凝胶法轻松合成具有高量子产率的YAG：Ce ³⁺单分散微球

球形铈掺杂钇铝石榴石（YAG：Ce ³⁺）荧光粉颗粒既可以实现更高的堆积密度，又可以实现更低的光散射，从而可以获得优异的发白光二极管性能。在这项研究中，单分散的YAG：Ce ³⁺微球是通过快速的环氧化物驱动的溶胶-凝胶路线以及随后在还原性气氛下进行热处理而合成的。球形形态主要受相分离和凝胶化过程的影响，这可以通过水/乙醇的比例来控制。将Pluronic F127引入溶胶-凝胶系统以控制YAG：Ce ³⁺微球的尺寸，这显着增加了YAG：Ce ³⁺的发光强度微球。经测量，掺有6 mol％Ce ³⁺离子的YAG微球的发光量子产率超过90％，与商业YAG：Ce ³⁺磷光体的发光量子产率一样高。这种方法可以很容易地应用于制备各种稀土掺杂的微球，这意味着制备具有规则形状和高量子产率的LED荧光粉的新途径。