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

Renero-Lecuna, C.; Martin-Rodriguez, R.; Valiente, R.; Gonzalez, J.; Rodriguez, F.; Krämer, K.W.; Güdel, H.U. (2011). Origin of the high upconversion green luminescence efficiency in -NaYF4:2% Er3+,20% Yb3+. Chemistry of materials, 23(15), pp. 3442-3448. Washington, D.C.: American Chemical Society 10.1021/cm2004227

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Site-selective spectroscopy in hexagonal beta-NaYF4:Er3+,Yb3+ has revealed different environments for Er3+ ions (multisite formation). The low-temperature S-4(3/2) -> (I15/2Er3+)-I-4 green emission depends on the excitation wavelength associated with the F-4(7/2) Er3+ level. We have studied the effect of hydrostatic pressure on the green, red, and blue Er3+ emission upon NIR excitation at similar to 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 beta-NaYF4:Er3+,Yb3+ compound is mainly due to the multisite distribution, and the low phonon energy of the host lattice.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Krämer, Karl and Güdel, Hans-Ulrich

ISSN:

0897-4756

Publisher:

American Chemical Society

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:26

Last Modified:

06 Dec 2013 13:30

Publisher DOI:

10.1021/cm2004227

Web of Science ID:

000293357100008

URI:

https://boris.unibe.ch/id/eprint/9264 (FactScience: 214960)

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