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Origin of the high upconversion green luminescence efficiency in B-NaYF4:2%Er3+,20%Yb3+

Abstract: Site-selective spectroscopy in hexagonal b-NaYF4:Er3+,Yb3+ has revealed different environments for Er3+ ions (multisite formation). The low-temperature 4S3/2 -- 4I15/2 Er3+green emission depends on the excitation wavelength associated with the 4F7/2 Er3+ level. We have studied the effect of hydrostatic pressure on the green, red, and blue Er3+ emission upon NIR excitation at ?980 nm, in order to establish the role played by energy resonance conditions and the multiple Er3+ sites due to the disordered structure for the upconversion (UC) process (energy tuning). The variation of photoluminescence spectra and lifetimes as a function of pressure and temperature reveals that the origin of the high green UC efficiency of the B-NaYF4:Er3+,Yb3+ compound is mainly due to the multisite distribution, and the low phonon energy of the host lattice.

 Autoría: Renero-Lecuna C., Martín-Rodríguez R., Valiente R., González J., Rodríguez F., Krämer K.W., Güdel H.U.,

 Fuente: Chemistry of Materials, 2011, 23(15), 3442-3448

Editorial: American Chemical Society

 Fecha de publicación: 06/07/2011

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/cm2004227

ISSN: 0897-4756,1520-5002

 Proyecto español: MAT2008-06873-C02-01

Url de la publicación: https://doi.org/10.1021/cm2004227

Autoría

CARLOS RENERO LECUNA

JESUS ANTONIO GONZALEZ GOMEZ

GÜDE, H. U