Liu Yan, Qin Xianpeng, Gan Lin, Zhou Guohong, Hu Song, Wang Zhengjuan, Jiang Juan, Zhang Tianjin, Chen Hetuo
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Collaborative Innovation Center for Advanced Organic Chemical Materials Co-Constructed by the Province and Ministry, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, Wuhan 430062, China.
Materials (Basel). 2024 Jan 13;17(2):402. doi: 10.3390/ma17020402.
Highly transparent Ho:YO ceramics for laser diode lighting were prepared using the vacuum sintering method with 0.3 at.% NbO as a sintering additive. The microstructures, transmittance, and luminescence properties of the Ho:YO ceramic samples were investigated in detail. The transmittance levels of all samples with various Ho concentrations reached ~81.5% (2 mm thick) at 1100 nm. Under the excitation of 363 nm (ultraviolet) or 448 nm (blue) light, Ho:YO transparent ceramic samples showed that green emission peaked at 550 nm. The emission intensity was strongly affected by the concentration of Ho ions, reaching its highest level in the sample doped with 1 at.% Ho. The CIE coordinates of the luminescence were in the green region (i.e., the CIE coordinates of the sample doped with 1 at.% Ho were [0.27, 0.53] and [0.30, 0.69], under the excitation of 363 nm and 448 nm light, respectively). The possibility of its application as laser diode lighting was reported. Under the excitation of 450 nm blue laser, the sample doped with 0.5 at.% Ho had the best performance: the saturated luminous flux, lumen efficiency, and the luminescence saturation power densities were 800 lm, 57.7 lm/W, and 17.6 W/mm, respectively. Furthermore, the materials have high thermal conductivity and mechanical strength due to their host of rare-earth sesquioxide. Thus, Ho:YO transparent ceramics are expected to be a promising candidate for green-light-emitting devices for solid-state lighting, such as laser diode lighting.
采用真空烧结法，以0.3 at.%的NbO作为烧结添加剂，制备了用于激光二极管照明的高透明Ho:YO陶瓷。详细研究了Ho:YO陶瓷样品的微观结构、透过率和发光性能。所有不同Ho浓度样品在1100 nm处的透过率均达到~81.5%（2 mm厚）。在363 nm（紫外）或448 nm（蓝光）光激发下，Ho:YO透明陶瓷样品显示出在550 nm处峰值的绿色发射。发射强度受Ho离子浓度的强烈影响，在掺杂1 at.% Ho的样品中达到最高水平。发光的CIE坐标位于绿色区域（即，在363 nm和448 nm光激发下，掺杂1 at.% Ho的样品的CIE坐标分别为[0.27, 0.53]和[0.30, 0.69]）。报道了其作为激光二极管照明应用的可能性。在450 nm蓝光激光激发下，掺杂0.5 at.% Ho的样品性能最佳：饱和光通量、流明效率和发光饱和功率密度分别为800 lm、57.7 lm/W和17.6 W/mm。此外，由于其稀土 sesquioxide主体，该材料具有高导热性和机械强度。因此，Ho:YO透明陶瓷有望成为用于固态照明的绿色发光器件（如激光二极管照明）的有前途的候选材料。
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