Portal de Periódicos da CAPES

Thulium concentration quenching in the up-converting α-Tm3+/Yb3+ NaYF4 colloidal nanocrystals

2013; Elsevier BV; Volume: 35; Issue: 5 Linguagem: Inglês

10.1016/j.optmat.2013.01.002

1873-1252

Małgorzata Misiak, Katarzyna Prorok, Bartłomiej Cichy, Artur Bednarkiewicz, W. Stręk,

Radiation Detection and Scintillator Technologies

Luminescence spectra, power dependence and luminescence lifetimes were measured and studied in pure cubic phase NaYF4:20%Yb3+, x%Tm3+ (where x = 0.1%, 0.2%, 0.5%, 1% and 2%) nanocolloidal phosphors synthesized by thermal decomposition. Increasing concentration of Tm3+ ions led to decrease of luminescence intensity, increase in the slopes of power dependence as well as to the decrease in the luminescence decay- and rise-times, helping to resolve the mechanisms of up-conversion and concentration quenching.