Over the span of years, Mn4+-doped red phosphors have been utilized to meaningful optoelectronic devices due to their outstanding optical properties, and Tm3+ usually is used for activator ion because of its efficient up-conversion emission, but the down-conversion processes are rarely used. Herein, we have successfully synthesized a series of novel La0.557Li0.33Ti1-xO3:xMn4+ (x = 0.1–7 %) phosphors. The photoluminescence properties have been analysis in detailed. Using Mn4+-Tm3+ co-doped strategy, we successfully synthesis La0.557-yLi0.33Ti0.993O3:0.7 %Mn4+, yTm3+ phosphors. Upon excitation with 360 nm light, this phosphor exhibits two distinct emission peaks at 729 nm and 806 nm. The emission intensity of Tm3+ is greatly improved after Mn4+ doping, which is attributed to the energy transfer of Mn4+ to Tm3+. In terms of potential applications, utilizing fluorescence intensity ratio technology, La0.551Li0.33Ti0.993O3:0.7 %Mn4+, 0.6 %Tm3+ exhibits maximum absolute and relative sensitivities of 3.25 % K−1 at 523 K and 3.49 % K−1 at 298 K, which demonstrating its potential for application in optical thermometry. Furthermore, The NIR-LED using phosphor and 365 nm chips reveals potential applications of the La0.551Li0.33Ti0.993O3:Mn4+, Tm3+ phosphor in NIR night vision and biosensing.

中文翻译：

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La0.557Li0.33TiO3 的光致发光特性和 Mn4+ → Tm3+ 能量转移：Mn4+、Tm3+ 用于测温和 NIR-LED 应用


多年来，Mn4+掺杂红色荧光粉因其出色的光学性能而被应用于有意义的光电器件，而Tm3+因其高效的上转换发射而通常用于激活剂离子，但下转换过程很少见。用过的。在此，我们成功合成了一系列新型La0.557Li0.33Ti1-xO3:xMn4+ (x = 0.1–7%)荧光粉。对光致发光特性进行了详细分析。采用Mn4+-Tm3+共掺杂策略，成功合成了La0.557-yLi0.33Ti0.993O3:0.7%Mn4+、yTm3+荧光粉。在 360 nm 光激发下，该磷光体在 729 nm 和 806 nm 处表现出两个不同的发射峰。 Mn4+掺杂后Tm3+的发射强度大大提高，这归因于Mn4+向Tm3+的能量转移。在潜在应用方面，利用荧光强度比技术，La0.551Li0.33Ti0.993O3:0.7 %Mn4+, 0.6 %Tm3+ 在 523 K 时表现出最大绝对和相对灵敏度 3.25 % K−1 在 298 K 时为 3.49 % K−1 K，这证明了其在光学测温中的应用潜力。此外，使用荧光粉和 365 nm 芯片的 NIR-LED 揭示了 La0.551Li0.33Ti0.993O3:Mn4+、Tm3+ 荧光粉在近红外夜视和生物传感中的潜在应用。