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Design of Layer‐Structured KAlF4:Yb/Er for Pressure‐Enhanced Upconversion Luminescence
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-11-25 , DOI: 10.1002/adom.201901031
Kun Zhang 1 , Chao Gao 1 , Zhang Jiang 1 , Yang Wei 1 , Yue Pan 1 , Cong Wei 1 , Hai Li 1 , Kai Wang 2 , Bo Zou 2 , Ling Huang 1
Affiliation  

Promising applications of downshifting mechanoluminescence have raised wide research enthusiasms in the past decades. However, weakened upconversion luminescence is usually obtained in lanthanide‐doped materials under hydrostatic pressures. In layer‐structured KAlF4, the z‐axis has smaller elastic constant than that of the x‐ or y‐axis, which can effectively tolerate high pressure influence on the coordination environment of luminescent ions by reducing the inter‐layer distance and lead to enhanced upconversion luminescence. Indeed, a record‐high of 2.5‐fold luminescence enhancement at 6.01 GPa was obtained. Moreover, the crystal structure remains stable until 22.98 GPa, showing great potential of this cheap and widely available compound in near‐infrared‐activated high‐pressure responsive optical sensors. Systematic analyses suggest that the local crystal symmetry distortion of Er3+ caused by shortened bond length of Al‐Fax ([001] axis) is responsible for this enhancement.

中文翻译:

压力增强上转换发光的层结构KAlF4:Yb / Er设计

在过去的几十年中,降档机械发光的有前途的应用引起了广泛的研究热情。但是,掺杂镧的材料通常在静水压力下会减弱上转换发光。在层结构的KAlF 4中z轴的弹性常数小于xy的弹性常数。轴,可以通过减小层间距离并增强上转换发光来有效地承受高压对发光离子配位环境的影响。的确,在6.01 GPa处获得了2.5倍的历史最高发光增强。此外,晶体结构在22.98 GPa之前保持稳定,显示出这种廉价且广泛可用的化合物在近红外激活的高压响应光学传感器中的巨大潜力。系统分析表明,由Al- Fax([001]轴)的键长缩短引起的Er 3+的局部晶体对称畸变是造成这种增强的原因。
更新日期:2020-01-17
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