The effect of pumping power on fluorescence behavior of LiNdP4O12 nanocrystals

The impact of excitation intensity on the Stokes and anti-Stokes luminescent properties of Nd3+ ions in stoichiometric LiNdP4O12 nanocrystalline powders was investigated. The Stokes fluorescence of the spectra relative intensities were strongly affected by excitation power at double 808 and 830 nm. The fluorescence decay became nonexponential and shortened with the pumping power increase. The efficient up-conversion under strong 808 nm excitation was observed in the visible range and four anti-Stokes bands were assigned. The up-conversion intensity was raising with a remarkably long time constant equal to around 1 s, which decreased with the pumping power increase.

Research highlights
► The fluorescence intensities and decay times in LiNdP4O12 are affected strongly by the incident light pumping power.
► The visible bright orange/yellow emission of LiNdP4O12 nanocrystals originating from higher lying terms of Nd3+ is observed under CW LD excitation.
► The visible emission from higher energy excited states is characterized by long rise times (∼1 s) which increased with energy of emitting state and decrease with increasing pumping power.