Abstract
Upconversion nanoparticles (UCNPs) have made a significant and valuable contribution to materials science, photophysics, and biomedicine, which benefit from their specific spectroscopic characters. However, the ensemble spectroscopy of UCNPs is limited for the electronic behavior in average effect, which ignores the fact that the nanoparticles are heterogeneous. Toward the research focus of heterogeneous intrinsic structure, unique photophysical phenomena, and advanced applications, the optical characterization of single UCNPs is promoted to a frontier breakthrough of UCNPs community. In this chapter, we overview the importance of the single UCNPs characterization, the typical principles of upconversion, and the single particle detection approaches. A considerable emphasis is placed on the specific spectroscopic study of single UCNPs, which shows us fantastic photophysical phenomena beyond ensemble measurement. Parallel efforts are devoted to the currently applications of single UCNPs.
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Acknowledgments
The authors acknowledge financial support from Zhejiang Provincial Natural Science Foundation of China (No. LY14E020007) and National Natural Science Foundation of China (No. 11404311).
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Zhou, J., Qiu, J. (2016). Upconversion Luminescence Behavior of Single Nanoparticles. In: Liu, RS. (eds) Phosphors, Up Conversion Nano Particles, Quantum Dots and Their Applications. Springer, Singapore. https://doi.org/10.1007/978-981-10-1590-8_10
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