Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 39, Pages 22807-22813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp507804h
Keywords
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Funding
- Natural Science Foundation of China (NSFC) [51302038]
- Natural Science Foundation of Jiangsu Province of China [BK2011064, BK2012346]
- Fundamental Research Funds for the Central Universities [CXLX12_0083]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1351]
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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 electronphonon 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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