A super-high brightness and excellent colour quality laser-driven white light source enables miniaturized endoscopy,Materials Horizons

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A super-high brightness and excellent colour quality laser-driven white light source enables miniaturized endoscopy
Materials Horizons ( IF 12.2 ) Pub Date : 2023-08-12 , DOI: 10.1039/d3mh01170d
Shuxing Li ₁ , Linhui Huang ₁ , Yunqin Guo ₁ , Le Wang ₂ , Rong-Jun Xie _{1,

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Affiliation

A laser-driven white light source promises intrinsic advantages for miniaturized endoscopic illumination. However, it remains a great challenge to simultaneously achieve high brightness and excellent colour rendition due to the shortage of highly efficient and thermally robust red-emitting laser phosphor converters. Here, we designed CaAlSiN₃:Eu@Al (CASN@Al) converters with neglectable efficiency loss by tightly bonding all-inorganic phosphor films on an aluminium substrate. A layer-by-layer phosphor converter (LuAG/CASN@Al), i.e., stacking a green-emitting Lu₃Al₅O₁₂:Ce (LuAG) layer on CASN@Al, was constructed to enhance light conversion efficiency and reduce reabsorption loss under blue laser excitation, which thus produces an excellent white light source with a luminous efficacy of 258 lm W⁻¹ and a colour rendering index of 91. A miniaturized endoscopy with a coupling efficiency twice that of the commercial white LEDs was demonstrated by using the laser-driven white light and showed a central illuminance as high as 52 730 lx, more vivid images and long-term reliability.

中文翻译：

超高亮度和出色色彩质量的激光驱动白光源使内窥镜小型化

激光驱动的白光源为小型化内窥镜照明带来了固有的优势。然而，由于缺乏高效且耐热的红光激光荧光转换器，同时实现高亮度和出色的演色性仍然是一个巨大的挑战。在这里，我们通过将全无机荧光粉薄膜紧密粘合在铝基板上，设计了 CaAlSiN _{3 :Eu@Al (CASN@Al) 转换器，其效率损失可忽略不计。}构建了一种逐层荧光粉转换器（LuAG/CASN@Al），即在CASN@Al上堆叠发绿光的Lu ₃ Al ₅ O ₁₂ :Ce (LuAG)层，以提高光转换效率并减少重吸收蓝色激光激发下的损耗，从而产生优异的白光源，发光效率为 258 lm W ^-1，显色指数为 91。通过使用激光驱动的白光，中心照度高达52 730 lx，图像更生动，长期可靠性高。

更新日期：2023-08-16

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