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Upconversion emission in CaTiO3:Er3+ nanocrystals

Authors:	PJ Dereń R Mahiou R Pązik K Lemanski W Stręk Ph Boutinaud

Institution:	1. Institute of Low Temperatures and Structure Researches, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw 2, Poland;2. LMI, UMR 6002-CNRS, Université Blaise Pascal, et ENSCCF, F-63177 Aubière Cedex, France;1. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain;2. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas, 28049 Madrid, Spain;3. Departamento de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain

Abstract:	CaTiO₃:Er³⁺ (5%) nanocrystals were obtained by sol–gel method under acidic conditions. The sizes of nanocrystals were 40 nm. Strong green anti-Stokes emission was observed after excitation of the ⁴I_9/2 and ⁴I_11/2 level. The emission is due to excited state absorption (ESA) and energy transfer upconversion (ETU).

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