发光
光子上转换
材料科学
纳米颗粒
声子
镧系元素
化学物理
辐射传输
六角相
量子点
凝聚态物理
分子物理学
纳米技术
光电子学
六方晶系
化学
离子
物理
结晶学
光学
有机化学
作者
Dongdong Li,Qiyue Shao,Yan Dong,Jianqing Jiang
摘要
Size-dependent quantum confinement has important effects on the energy transfer and radiative and nonradiative transitions in nanophosphors. For lanthanide-doped nanoparticles, the confinement effect is induced mostly via electron–phonon interaction, and analysis of temperature-dependent spectroscopic properties provides an effective method for disclosing its underlying mechanism. Herein, an intriguing and unprecedented enhancement of the upconversion luminescence (UCL) at higher temperatures in hexagonal-phase NaYF4:Yb3+, Er3+ upconversion nanoparticles (UCNPs) is reported. Moreover, this anomalous UCL enhancement shows a strong dependence on the particle size and becomes more significant for UCNPs with a smaller size. This anomalous thermal behavior is interpreted on the basis of phonon-assisted energy transfer and phonon confinement effect. The findings are relevant to the engineering of the nanostructures of UCNPs and to the further understanding of the UCL mechanism.
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