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Modeling blue to UV upconversion in B-NaYF4:Tm3+

Abstract: Samples of 0.01% and 0.3% Tm3+-doped b-NaYF4 show upconverted UV luminescence at 27 660 cm1 (361 nm) after blue excitation at 21 140 cm1 (473 nm). Contradictory upconversion mechanisms in the literature are reviewed and two of them are investigated in detail. Their agreement with emission and two-color excitation experiments is examined and compared. Decay curves are analyzed using the Inokuti?Hirayama model, an average rate equation model, and a microscopic rate equation model that includes the correct extent of energy transfer. Energy migration is found to be negligible in these samples, and hence the average rate equation model fails to correctly describe the decay curves. The microscopic rate equation model accurately fits the experimental data and reveals the strength and multipolarity of various interactions. This microscopic model is able to determine the most likely upconversion mechanism.

 Autoría: Villanueva-Delgado P., Krämer K., Valiente R., De Jong M., Meijerink A.,

 Fuente: Physical Chemistry Chemical Physics, 2016, 18, 27396

 Editorial: Royal Society of Chemistry

 Año de publicación: 2016

 Nº de páginas: 9

 Tipo de publicación: Artículo de Revista

 DOI: 10.1039/c6cp04347j

 ISSN: 1463-9076,1463-9084

 Url de la publicación: https://doi.org/10.1039/c6cp04347j

Autoría

VILLANUEVA-DELGADO, PEDRO

KRÄMER, KARL W.

DE JONG, MATHIJS

MEIJERINK, ANDRIES