Nowadays, Mn⁴⁺-doped oxide phosphors have attracted more and more attentions owing to their widespread applications in white LEDs, optical data storage and agricultural production, but these phosphors have two most significant problems including thermal quenching (TQ) and low quantum efficiency. Here, we report a far-red-emitting LaAlO₃:3%Ca²⁺,1%Bi³⁺,0.1%Mn⁴⁺ perovskite phosphor which exhibits zero-TQ even up to 150 ℃ and high internal quantum efficiency (IQE) of 89.3%. To our best knowledge, the zero-TQ phenomenon is first realized in Mn⁴⁺-activated perovskite phosphors caused by the synergistic action of Ca²⁺ and Bi³⁺ which is attributed to the efficient energy transfer, energy compensation and structural rigidity enhancement. Moreover, the gratifying luminous performance improvement is obtained due to charge compensation effect, optimized crystal field and excited electrons transfer. The main emission peak of this phosphor is monitored at ∼730 nm which perfectly matches the absorption spectrum of phytochrome P_FR which has a good application prospect for improving plant seed germination, flowering, fruiting and aging. These findings may provide a feasible way to simultaneously improve thermal stability and quantum efficiency of Mn⁴⁺ luminescence in oxide hosts.

如今，由于Mn ⁴⁺掺杂的氧化物磷光体在白光LED，光学数据存储和农业生产中的广泛应用，引起了越来越多的关注，但是这些磷光体具有两个最重要的问题，包括热猝灭（TQ）和低量子效率。在这里，我们报告了一种发出远红光的LaAlO ₃：3％Ca 2 ⁺，1％Bi ³⁺，0.1％Mn ⁴⁺钙钛矿型荧光粉，即使在150℃以下，其零TQ值也很高，内部量子效率（IQE）占89.3％。据我们所知，零TQ现象首先是由Ca ²⁺和Bi ³⁺的协同作用在Mn ⁴⁺活化的钙钛矿荧光粉中实现的这归因于有效的能量传递，能量补偿和结构刚度的提高。此外，由于电荷补偿效应，优化的晶体场和激发的电子转移，获得了令人满意的发光性能改善。该荧光粉的主发射峰在约730 nm处监测，与植物色素P _FR的吸收光谱完全匹配，对改善植物种子的发芽，开花，结果和衰老具有良好的应用前景。这些发现可能为同时提高氧化物主体中Mn ⁴⁺发光的热稳定性和量子效率提供一种可行的方法。