激发
光子上转换
纳米颗粒
镧系元素
材料科学
亮度
兴奋剂
共发射极
离子
荧光
分析化学(期刊)
纳米技术
光电子学
化学
光学
物理
有机化学
量子力学
色谱法
作者
Shihui Wen,Du Li,Yongtao Liu,Chaohao Chen,Fan Wang,Jiajia Zhou,Guochen Bao,Le Zhang,Dayong Jin
标识
DOI:10.1021/acs.jpclett.2c01186
摘要
Lanthanide-doped upconversion nanoparticles (UCNPs) have enabled a broad range of emerging nanophotonics and biophotonics applications. Here, we provide a quantitative guide to the optimum concentrations of Yb3+ sensitizer and Tm3+ emitter ions, highly dependent on the excitation power densities. To achieve this, we fabricate the inert-core@active-shell@inert-shell architecture to sandwich the same volume of the optically active section. Our results show that highly doped UCNPs enable an approximately 18-fold enhancement in brightness over that of conventional ones. Increasing the Tm3+ concentration improves the brightness by 6 times and increases the NIR/blue ratio by 11 times, while the increase of Yb3+ concentration enhances the brightness by 3 times and only slightly affects the NIR/blue ratio. Moreover, the optimal doping concentration of Tm3+ varies from 2% to 16%, which is highly dependent on the excitation power density ranging from 102 to 107 W/cm2. This work provides a guideline for designing bright UCNPs under different excitation conditions.
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