Tunable light emission mediated by energy transfer in Tm3+/Dy3+ co-doped LaF3 nanocrystals under UV excitation

Emission spectra of LaF3:3Tm/xDy3+[x=0.02 mol% (blue), x=0.5 mol% (white), and x=2.0 mol% (yellow)] nanoparticles excited at 360 nm. Inset: Chromaticity coordinates of the sample LaF3:3Tm/xDy3+ with x=0.02, 0.1, 0.5, 1.0, and 2.0 mol%) nanoparticles under excitation at 360 nm.253