Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Tokyo 125-8585, Japan.
Langmuir. 2013 Sep 3;29(35):11185-91. doi: 10.1021/la401810x. Epub 2013 Aug 22.
We discuss the micromolding in capillaries technique for the direct fabrication of calcination-free rare earth ion-doped (RE) phosphor films consisting of RE nanoparticles on plastic sheets. We synthesized two types of RE nanoparticles consisting of Y2O3 matrix doped with Er and Yb ions. Green upconversion luminescence, red upconversion luminescence, and near-infrared fluorescence appeared from the RE nanoparticles under excitation of near-infrared light. Adjusting the channel width and depth of polydimethylsiloxane molds led to control of the density of nanoparticles in the patterned RE nanoparticle films. Adjusting concentration of the RE nanoparticle dispersion and size of the RE nanoparticles allowed for the control of the density of nanoparticles in the patterned RE nanoparticle films. The density of nanoparticles in the patterned RE films on plastic sheets increased with an increase in the number of injection and drying of the RE nanoparticle dispersion. These results demonstrate that this technique enables us to directly fabricate the patterned RE phosphor films on plastic sheets, leading to the fabrication of inorganic flexible devices with small fabrication steps and material consumptions.
我们讨论了在毛细管中进行微成型的技术，用于直接制造由塑料片上的稀土离子掺杂（RE）纳米粒子组成的免煅烧 RE 荧光粉薄膜。我们合成了两种类型的由 Y2O3 基质掺杂 Er 和 Yb 离子的 RE 纳米粒子。在近红外光激发下，这些 RE 纳米粒子呈现出绿色上转换发光、红色上转换发光和近红外荧光。通过调整聚二甲基硅氧烷模具的通道宽度和深度，可以控制图案化 RE 纳米粒子膜中的纳米粒子密度。通过调整 RE 纳米粒子分散体的浓度和 RE 纳米粒子的尺寸，可以控制图案化 RE 纳米粒子膜中的纳米粒子密度。在塑料片上的图案化 RE 薄膜中的纳米粒子密度随 RE 纳米粒子分散体的注入和干燥次数的增加而增加。这些结果表明，该技术使我们能够直接在塑料片上制造图案化的 RE 荧光粉薄膜，从而在具有小的制造步骤和材料消耗的情况下制造无机柔性器件。
