文献类型：期刊文献

英文题名：Mismatched Refractive Index Strategy for Fabricating Laser-Driven Wood Diffusers from Bulk Wood for Illumination Applications

作者：Tang, Qiheng[1] Yuan, Xiao[1] Zou, Miao[1] Zhang, Lei[1] Chang, Liang[1] Chen, Xueqi[1] Zhang, Jie[1] Zhou, Guanwu[1] Gao, Kezheng[2] Guo, Wenjing[1] Chen, Yongping[1]

第一作者：唐启恒

通信作者：Tang, QH[1];Chen, YP[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, 1 Dongxiaofu, Beijing 10091, Peoples R China;[2]Zhengzhou Univ Light Ind, Sch Mat & Chem Engn, Zhengzhou 450002, Peoples R China

年份：2024

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20240215341351);Scopus(收录号：2-s2.0-85181485157);WOS:【SCI-EXPANDED(收录号:WOS:001142156200001)】；

基金：The authors thank the Program for the Young Top-notch Talents of the National Forestry and Grassland Administration (2022132007) and the Young Scientists Fund of the National Natural Science Foundation of China (31800484).

语种：英文

外文关键词：laser-driven illumination; light scattering; mismatched refractive index; natural wood; poly(ethylene glycol) diacrylate

摘要：Laser-diode-based solid-state lighting is primarily used in state-of-the-art illumination systems. However, these systems rely on light-converting inorganic phosphors, which have low quantum efficiencies and complex manufacturing conditions. In this study, a mismatched refractive index strategy is proposed to directly convert natural bulk wood into a laser-driven wood diffuser using a simple delignification and polymer infiltration method. The resulting material has the potential to be used in laser-driven diffuse illumination applications. The optical performance of the laser-driven wood diffuser is optimized by changing the density of natural wood. The optimal coefficient of illuminance variation of the wood diffuser is as low as 17.7%, which is significantly lower than that of commercial diffusers. The illuminance uniformity is larger than 0.9, which is significantly higher than the ISO requirements for indoor workplace lighting. The laser damage threshold is 7.9 J cm-2, which is considerably higher than those of the substrates of commercially available phosphors. Furthermore, the optimized wood diffuser exhibits outstanding mechanical properties, excellent thermal stability, tolerance to harsh environmental conditions, and low speckle contrast. These results show that the laser-driven wood diffuser is a promising laser-color converter that is suitable for indoor, long-distance outdoor, undersea, and other high-luminance laser lighting applications. Laser-driven wood diffusers are prepared by impregnating porous delignified wood with poly(ethylene glycol) diacrylate with a mismatched refractive index to enhance scattering. The fabrication of laser-driven wood diffusers is simple, environment-friendly, and rapid. This low-cost and highly efficient strategy can provide substantial energy savings and a basis for the application of natural wood in emerging laser diode lighting technology.image