Lanthanide upconversion luminescence at the nanoscale: fundamentals and optical properties

Annemarie Nadort, Jiangbo Zhao, Ewa M. Goldys
2016 Nanoscale  
Upconversion photoluminescence is a nonlinear effect where multiple lower energy excitation photons produce higher energy emission photons.
doi:10.1039/c5nr08477f pmid:26986473 fatcat:tk7hifn6ynbkbbmjloubpftmlq