Impact of sensitizer Yb and activator Tm on luminescence intensity of β-NaYF4:Yb/Tm nanoluminophoresстатья
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Дата последнего поиска статьи во внешних источниках: 6 июля 2022 г.
Аннотация:In this study, the impact of sensitizer and activator ions concentration on the intensity of upconversionluminescence of nanoluminophores -NaYF4:Yb3+/Tm3+ in dimethyl sulfoxide (DMSO) was investigated.Analysis of all luminescence spectral bands allows one to establish that the ratio of concentrations ofytterbium and thulium ions strongly effects on the luminescent properties of nanoluminophores. Increase ofsensitizer concentration at constant activator concentration leads to an increase of the luminescence integralintensity. Optimal concentration of activators at fixed sensitizer concentration was determined: 2 mol.% forthulium and 18 mol.% for ytterbium. The sensitivity of each luminescence spectrum band to changes in theconcentration of activators and sensitizers was explained by cross-relaxation processes in activator ions.