稀土掺杂高居里点铁电陶瓷的上转换发光及温度传感性能研究

Owing to the unique optical properties, rare-earth doped upconversion materials (UM) exhibit extensive applications in laser technology, temperature sensor, optical communications, optical data storage and display, etc. Recently, as a new type of the promising UMs, rare earth doped upconverted ferroelectrics have attracted much attentions because of their excellent luminescent properties and the great importance in the optical-electrical integration devices. However, recent studies on upconverted ferroelectrics many restricted in the lower.temperature range, e.g. ambient room temperature, because of the decrease luminescent properties with uncertain factors of the structure evolution at high temperature. Hence, we propose to study on high temperature upconversion of rare earth doped ferroelectric ceramics with high Curie point. The major part of the proposal is studying high-temperature luminescence properties that affected by the.preparation technology, defect and phonon energy of structure and etc. Furthermore, we also study that how to fabricate the up-converted ferroelectrics with high qualities and improve the luminescent performance at high temperature. The ultimate goal of this project is to develop new ferroelectrics that process excellent upconversion luminescence with the excellent temperature sensing ability.in a wide temperature range. We envisage that this project will not only exploit the application fields of ferroelectric ceramics, but also further promote the development of the high temperature sensors from both on the experimental data and the proposed theory based on the studies on the upconverted high Tc ferroelectrics.

稀土掺杂上转换发光材料具有独特的光学性能，其在激光技术、温度传感器、光纤通信技术、光信息存储和显示等领域有极大的应用价值。近年来，稀土掺杂的上转换铁电材料由于具有良好的发光性能和铁电发光多功能性而备受关注。然而，受限于高温产生的相结构改变所导致发光性能减弱，高温下的上转换发光及温度传感性能研究相对滞后。本项目以稀土掺杂高居里点（Tc>600℃）铁电陶瓷为研究对象，在宽温度范围实现相结构的稳定，研究同相结构中的掺杂离子、制备工艺、缺陷和声子能等对上转换发光过程的影响及规律；同时研究高性能发光铁电陶瓷材料的制备方法和工艺，开发出更宽温度范围（-100℃-400℃），特别是高温（100℃-400℃）下，具有良好上转换发光及温度传感性能的铁电陶瓷材料。该目标的实现将拓展铁电陶瓷的应用领域，实现宽温度范围和高温下优良的上转换发光及温度传感，为开发宽温度范围的温度传感器奠定基础。

稀土掺杂的上转换铁电材料由于具有良好的发光性能和在光电集成器件中的潜在应用而备受关注。然而，受限于高温产生的相结构改变所导致发光性能减弱，高温下的上转换发光及温度传感性能研究相对滞后。本课题我们利用具有上转换发光特性的稀土离子（Er，Er/Yb等）引入到高居里点铁电陶瓷材料（Bi4Ti3O12、Na0.5Bi4.5Ti4O15、Na0.5Bi8.5Ti7O27、Na0.5Bi2.5Ta2O9、M0.5Bi2.5Nb2O9（M=Li, Na, K）等）中，在宽温度范围（-100℃-400℃）内实现相结构的稳定，通过控制材料结构或离子掺杂的浓度能够有效调控材料的温度传感特性。尤其在探索改善温度传感特性研究的过程中，发现光致变色效应能够进一步增强材料的温度传感特性，揭示了光致变色效应对温度传感性能影响的机制，为进一步提高无机材料的温度传感性能提供了一个新的策略和方法，探索出一条新的研究思路。并得到2种具备宽温度范围，尤其是高温下上转换发光及温度传感性能良好的材料。从而拓展铁电陶瓷的应用领域，也为上转换发光材料的更广泛应用提供材料基础和理论支持。相关的研究结果发表在国际主流期刊Advanced Optical Materials，Chemical Engineering Journal，Journal of Materials Chemistry C等11篇，申请国家发明专利1项，培养硕士研究生3名。