Abstract
Improving luminescence efficiency is of vital importance for applications of rare-earth-doped upconversion materials. Herein, we present highly efficient upconversion nanocrystal, which is brighter than the state-of-the-art co-doped core–shell material, through heavily doping and 1530 nm excitation. Moreover, upconversion characteristics and mechanisms of heavily doped core nanocrystals and their core–shell counterparts are investigated carefully.
© 2019 Optical Society of America
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