材料科学
发光
光子上转换
机械容积
静水压力
光电子学
镧系元素
兴奋剂
Crystal(编程语言)
离子
纳米技术
化学
物理
有机化学
计算机科学
热力学
程序设计语言
作者
Kun Zhang,Chao Gao,Zhang Jiang,Yang Wei,Yue Pan,Wei Cong,Hai Li,Kai Wang,Bo Zou,Ling Huang
标识
DOI:10.1002/adom.201901031
摘要
Abstract 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 KAlF 4 , 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 Er 3+ caused by shortened bond length of Al‐F ax ([001] axis) is responsible for this enhancement.
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