Cai Kun-Bin, Huang Hsiu-Ying, Chen Po-Wen, Wen Xiao-Ming, Li Kai, Co King Chester Capinig, Shen Ji-Lin, Chiu Kuo-Pin, Yuan Chi-Tsu
Department of Physics, Chung Yuan Christian University, Taoyuan, Taiwan.
Nanoscale. 2020 May 21;12(19):10781-10789. doi: 10.1039/d0nr01668c. Epub 2020 May 11.
Luminescent and transparent composites formed by embedding luminophores in a solid matrix are essential components for several photonic applications, such as luminescent solar concentrators (LSCs) and luminescent down-shifting/conversion layers. For these applications, the optical losses, including reabsorption and scattering need to be minimized, while the photoluminescence (PL) emission must be stable against outdoor environments. Here, highly transparent and luminescent aluminosilicate glass doped with surface-engineered gold nanoclusters (AuNCs) was prepared without involving toxic elements and hazardous solvents. Such an AuNC@glass composite with a high loading (∼14 wt%) exhibits a unique absorption profile; near-unity absorptance in the absorption range but near-zero reabsorption in the emission region, and thus generates bright PL emission with negligible reabsorption losses. Meanwhile, the PL quantum yield was enhanced (from ∼1% to ∼14%) without sacrificing the Stokes shift, while still maintaining high optical transparency. In addition, they have high stability due to the effective protection of rigid inorganic matrices, and thus would be eco-friendly candidates for further preparation of efficient and reabsorption-free LSCs.
通过将发光体嵌入固体基质中形成的发光且透明的复合材料是多种光子应用的关键组件，如发光太阳能聚光器（LSCs）和发光下转换/转换层。对于这些应用，包括再吸收和散射在内的光学损耗需要最小化，而光致发光（PL）发射必须在户外环境中保持稳定。在此，制备了掺杂有表面工程化金纳米团簇（AuNCs）的高透明且发光的铝硅酸盐玻璃，且未涉及有毒元素和有害溶剂。这种具有高负载量（约14 wt%）的AuNC@玻璃复合材料呈现出独特的吸收谱；在吸收范围内吸收率接近100%，但在发射区域再吸收接近零，因此产生明亮的PL发射，再吸收损耗可忽略不计。同时，PL量子产率得到提高（从约1%提高到约14%），而不牺牲斯托克斯位移，同时仍保持高光学透明度。此外，由于刚性无机基质的有效保护，它们具有高稳定性，因此将是进一步制备高效且无再吸收的LSCs的环保候选材料。
