Fabrication and optical properties of transparent ceramic persistent phosphors based on band-gap engineering

基于带隙工程的透明陶瓷持久荧光粉的制备及光学性能

• 批准号: 16J09849
• 负责人: 許 健
• 金额: $ 1.47万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2016
• 资助国家: 日本
• 起止时间: 2016-04-22 至 2018-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16J09849/
• 关键词: transparent ceramics; persistent phosphors; wLED; garnet; perovskite; band-gap engineering; trap engineering; energy transfer; optical property; rare earths; transparent ceramics; persistent phosphors; wLED; garnet; perovskite; band-gap engineering; trap engineering; energy transfer; optical property; rare earths

In the fiscal year of 2017, various kinds of lanthanide-chromium doped garnet (transparent) ceramic persistent phosphors have been successfully developed with tunable emission bands from yellow to deep-red, even near-infrared (NIR) for new type wLED and biomedical applications.[1] Six different Cr3+ doped garnets were developed as a vivid example to introduce how to design promising persistent phosphors utilizing the “crystal field engineering” of Cr3+ emission in the deep-red region based on Tanabe-Sugano (d3) diagram, and how to choose proper lanthanide ions as co-doping sensitizers to further enhance the Cr3+ persistent luminescence by constructing the host referred binding energy (HRBE) diagram as a powerful theoretical prediction tool.[2] Utilizing two independent electron traps with two different trap depths in the Er3+ and Cr3+ co-doped Y3Al2Ga3O12 (YAGG:Er-Cr) persistent phosphor, the Cr3+/Er3+ PersL can be recharged in situ by photostimulation with 660 nm red LED thanks to the redistribution of trapped electrons from the deep trap to the shallow one. The results serve as a guide in developing promising NIR (>1000 nm) persistent phosphors used for long-term rechargeable optical imaging.[3] GAGG:Ce-Pr-Cr was chosen as the candidate material composition coupled with commercial blue LED (460 nm) to design a new type wLED device with an enhanced color rendering index (CRI) value. Furthermore, such kind of wLED devices can even act as persistent phosphors emitting yellow persistent luminescence continuously for several hours after stopping the power supply.

在2017年财政年度，已成功开发了各种植物掺杂石榴石（透明）陶瓷持续磷光剂的各种植物掺杂石榴石（透明），从黄色到深红色，甚至是近红外（NIR）的可调发射带，用于新型和生物医学应用。[1]开发了六个不同的CR3+掺杂石榴石作为一个生动的例子，以介绍如何设计承诺持续的磷光器，利用深红色区域中CR3+排放的“晶体现场工程”基于Tanabe-Sugano（D3）图（D3）图，以及如何通过将适当的灯笼离子构建为持续的型号，以构建适当的灯笼式传感器，以构建适当的型号的持续型号。 （HRBE）图作为强大的理论预测工具。[2]在ER3+和CR3+共掺杂的Y3AL2GA3O12（YAGG：ER-CR）持久的磷光体中，利用两个具有两个不同陷阱深度的独立电子陷阱，可以通过660 Nm红色的光线来重新分配陷阱，因此可以通过光量刺激来重新分配陷阱。该结果是开发有前途的NIR（> 1000 nm）持久性磷光体用于长期可充电光学成像的指南。[3] GAGG：CE-PR-CR被选为候选材料组成，再加上商用蓝色LED（460 nm），以设计具有增强颜色渲染指数（CRI）值的新型WLED设备。此外，这种wled设备甚至可以充当持续的磷光器，在停止电源后连续发射黄色持续发光。