Abstract：
Laser lighting devices, comprising an ultraviolet (UV) laser chip and a phosphor material, have emerged as a highly efficient approach for generating high-brightness light sources. However, the high power density of laser excitation may exacerbate thermal quenching in conventional polycrystalline or amorphous phosphors, leading to luminous saturation and the eventual failure of the device. Here, for the first time, we raise a single-crystal (SCs) material for laser lighting considering the absence of grain boundaries that scatter electrons and phonons, achieving high thermal conductivity (0.81 W m-1 K-1) and heat-resistance (575 °C). The SCs products exhibit a high photoluminescence quantum yield (89%) as well as excellent stability toward high-power lasers (>12.41 kW/cm2), superior to all previously reported amorphous or polycrystalline matrices. Finally, the laser lighting device was fabricated by assembling the SC with a UV laser chip (50 mW), and the device can maintain its performance even after continuous operation for 4 h. Double perovskite single crystals doped with Yb3+/Er3+ demonstrated multimodal luminescence with the irradiation of 355 and 980 nm lasers, respectively. This characteristic holds significant promise for applications in spectrally tunable laser lighting and multimodal anticounterfeiting.
摘要：
激光照明装置，包括紫外(UV)激光器芯片和磷光体材料，已经成为产生高亮度光源的高效方法。然而,激光激发的高功率密度可能会加剧传统多晶或非晶磷光体的热猝灭，导致发光饱和和设备的最终故障。这里,第一次,考虑到没有分散电子和声子的晶界，我们提出了一种用于激光照明的单晶（SC）材料，实现高热导率（0.81Wm-1K-1）和耐热性（575°C）。SCs产品具有高光致发光量子产率（89％）以及对高功率激光器（>12.41kW/cm2）的优异稳定性，优于所有以前报道的无定形或多晶基质。最后,激光照明装置是通过将SC与UV激光芯片（50mW）组装而成的，即使连续运行4小时，该器件也能保持其性能。掺杂有Yb3+/Er3+的双钙钛矿单晶在355和980nm激光的照射下表现出多峰发光，分别。此特性对于光谱可调激光照明和多模态防伪应用具有重要意义。
