Near‐infrared light sources have potential applications in many fields. Cr3+ is a good luminescence centre to prepare near‐infrared phosphors. Improving the performance of existing near‐infrared luminescent materials has indeed attracted great interest from researchers. The luminescence properties of Zn2TiO4:Cr3+ were improved by crystal field engineering strategies. Zn2+–Ti4+ was partially replaced using a Li+–Nb5+ ion pair based on the Zn2TiO4:Cr3+ phosphors. Luminescence Cr3+‐activated luminescent materials are sensitive to changes in the local crystal structure and crystal field environment. Doping of Li+–Nb5+ increased the luminescence intensity up to 2.7 times that of the undoped sample. Also, the thermal stability of the phosphor was greatly increased by the replacement of Li+–Nb5+.

中文翻译：

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主晶格离子双重取代增强Zn2TiO4:Cr3+荧光粉的发光性能

近红外光源在许多领域都有潜在的应用。铬3+是制备近红外荧光粉的良好发光中心。提高现有近红外发光材料的性能确实引起了研究人员的极大兴趣。 Zn的发光特性2二氧化钛4:Cr3+通过晶体场工程策略进行了改进。锌2+–钛4+部分被Li取代+–铌5+基于 Zn 的离子对2二氧化钛4:Cr3+荧光粉。发光Cr3+‐激活发光材料对局部晶体结构和晶体场环境的变化敏感。锂掺杂+–铌5+与未掺杂样品相比，发光强度提高了2.7倍。此外，通过Li的替代，荧光粉的热稳定性大大提高。+–铌5+。