Abstract The multilayered structure thin films (Gd2(MoO4)3:Ho(Tm)/Yb @Gd2(MoO4)3:Yb)) were prepared through sol-gel and spin-coating method, while the average thinness was nearly 140 nm. We investigate the up-conversion luminescence of Gd2(MoO4)3:Ho(Tm)/Yb @Gd2(MoO4)3:Yb) thin films. The results show that the double-layer structured thin films are able to increase the emission intensity. The fluorescence enhancement factors of the luminescence from Gd2(MoO4)3:Ho/Yb @Gd2(MoO4)3:Yb) thin films, located at 540 and 662 nm, reach 7.5 and 4.3, respectively. And the enhancement factors of emissions located at 450, 475 and 650 nm (Gd2(MoO4)3:Tm/Yb @Gd2(MoO4)3:Yb)) reach 9, 2 and 2, respectively. The considerable enhancement is due to the suppression of surface quenching and energy harvesting via the Yb ions in the outer shell. In addition, the emission color of thin films can be modulated from yellow to blue via tuning the number of Gd2(MoO4)3:Ho/Yb and Gd2(MoO4)3:Tm/Yb layers, which provides a feasible strategy to tune the up-conversion emission color.

中文翻译：

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通过使用多层结构的 Tm(Ho)/Yb 共掺杂 Gd2(MoO4)3 薄膜的发射增强和颜色调制

摘要 通过溶胶-凝胶法和旋涂法制备了多层结构薄膜(Gd2(MoO4)3:Ho(Tm)/Yb@Gd2(MoO4)3:Yb)，平均厚度接近140 nm。我们研究了 Gd2(MoO4)3:Ho(Tm)/Yb@Gd2(MoO4)3:Yb) 薄膜的上转换发光。结果表明，双层结构薄膜能够提高发射强度。Gd2(MoO4)3:Ho/Yb@Gd2(MoO4)3:Yb)薄膜在540nm和662nm处发光的荧光增强因子分别达到7.5和4.3。位于 450、475 和 650 nm 的发射增强因子（Gd2(MoO4)3:Tm/Yb@Gd2(MoO4)3:Yb)）分别达到 9、2 和 2。显着的增强是由于通过外壳中的 Yb 离子抑制了表面淬火和能量收集。此外，