采用高温固相法制备了一种具有颜色变化的长余辉发光材料Mg₃Y₂Ge₃O₁₂∶Pr³⁺。通过X射线衍射、激发发射光谱、余辉衰减及热释光曲线等，对样品的结构、发光及余辉性能进行了系统分析。在283 nm激发下，发射光谱在485 nm和609 nm处表现出两个较强的尖峰发射，分别归属于Pr³⁺离子的³P₂→³H₄及³P₀→³H₆能级跃迁。通过对Pr³⁺离子浓度的调控，有效改变了绿光和红光的相对发射强度，从而实现了发光颜色的多色化。此外，在激发光源停止后该材料同样具有多色的余辉发射，对于最佳样品（Mg₃Y₂Ge₃O₁₂∶0.015Pr³⁺）的余辉时间可达1 200 s以上。之后，我们通过热释光曲线具体研究了陷阱的分布及余辉的充放能过程。结果表明，Mg₃Y₂Ge₃O₁₂∶0.015Pr³⁺材料中浅陷阱的浓度相对较低从而导致室温下的余辉性能较弱。由于材料在高温区域具有超宽带陷阱分布，因此，我们进一步探究了其在高温下的多色长余辉性能。在本工作中，我们成功制备了一种单一离子激活的发光及余辉颜色可调的长余辉发光材料，考虑到其在室温以及高温条件下都具有发光及余辉颜色变化的特点，该材料在高温预警标识以及防伪领域有着潜在的应用价值。

采用高温固相合成法制备了多组Yb³⁺/Ho³⁺/Tm³⁺不同物质的量分数掺杂的LiTaO₃多晶材料，测试了双掺Yb³⁺/Ho³⁺，Yb³⁺/Tm³⁺和三掺Yb³⁺/Ho³⁺/Tm³⁺的LiTaO₃多晶的X射线衍射图谱、紫外-可见吸收谱和上转换荧光发射谱。X射线衍射（XRD）结果显示，稀土离子掺杂没有改变LiTaO₃多晶的物质结构，这表明稀土离子以取代基质离子的方式进入了晶格中。样品的紫外吸收边显示，增加Ho³⁺或Tm³⁺物质的量分数会导致吸收边先红移再蓝移。在980 nm泵浦光激发下，可见光区域中出现上转换蓝光（475 nm）、绿光（545 nm）和红光（663 nm和650 nm）发射，通过改变LiTaO₃中的激活离子Ho³⁺-Tm³⁺物质的量分数，可对上转换荧光色度进行调节，物质的量分数配比为2.0%Yb³⁺/0.05%Ho³⁺/0.4%Tm³⁺的掺杂LiTaO₃多晶材料实现了最为接近标准白光的发射。

Flexible devices provide advantages such as conformability, portability, and low cost. Paper-based electronics offers a number of advantages for many applications. It is lightweight, inexpensive, and biodegradable, making it an ideal choice for disposable electronics. In this work, we propose a novel configuration of photodetectors using paper as flexible substrates and amorphous Ga2O3 as the active materials, respectively. The photoresponse characteristics are investigated systematically. A decent responsivity yield and a specific detectivity of up to 66 mA/W and 3×1012 Jones were obtained at a low operating voltage of 10 V. The experiments also demonstrate that neither the twisting nor bending deformation can bring obvious performance degradation to the device. This work presents a candidate strategy for the application of conventional paper substrates to low-cost flexible solar-blind photodetectors, showing the potential of being integrated with other materials to create interactive flexible circuits.