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Temperature and pressure dependence of the optical properties of Cr 3 + -doped Gd3Ga5O12 nanoparticles

Abstract: Since the crystal-field strength at the Cr3 + site is very close to the excited-state crossover (ESCO), this work investigates the optical properties of Cr3 + -doped Gd3Ga5O12 (GGG) nanoparticles as a function of temperature and pressure in order to establish the effect of the ESCO on the optical behaviour of nanocrystalline GGG. Luminescence, time-resolved emission and lifetime measurements have been performed on GGG:0.5% Cr3 + nanoparticles in the 25?300 K temperature range, as well as under hydrostatic pressure up to 20 GPa. We show how low temperature and high pressure progressively transforms broadband emission into a ruby-like luminescence. This behaviour together with the lifetime dependence on pressure and temperature are explained on the basis of the spin-orbit interaction between the 4T2 and 2E states of Cr3 + .

 Autoría: Martín-Rodríguez R., Valiente R., Rodríguez F., Bettinelli M.,

 Fuente: Nanotechnology, 2011, 22(26), 265707

Editorial: IOP Publishing

 Fecha de publicación: 17/05/2011

Nº de páginas: 8

Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0957-4484/22/26/265707

ISSN: 0957-4484,1361-6528

 Proyecto español: MAT2008-06873-C02-01

Url de la publicación: https://iopscience.iop.org/article/10.1088/0957-4484/22/26/265707