This article is cited in 13 papers

Optical properties

Effect of the geometric shape of Lu$_2$O$_3$ : Eu spherical nanocrystals on their spontaneous luminescence

A. N. Gruzintsev^a, G. A. Emel'chenko^b, Yu. V. Ermolaeva^c, V. M. Masalov^b, A. V. Tolmachev^c, C. Barthou<sup>d

a</sup> Institute of Microelectronics Technology and High-Purity Materials RAS
^b Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region
^c Institute for Single Crystals, National Academy of Sciences of Ukraine, Kharkov
^d Institut des NanoSciences de Paris, UPMC Univ Paris 06, CNRS, UMR, Paris, France

Abstract: Monodisperse red phosphor particles 100 nm in diameter with the Lu$_{1.90}$Eu$_{0.10}$O$_3$ composition have been prepared using the developed technique for synthesizing spherical colloidal lutetium oxide particles with a size dispersion in the range 10–15%. The structure of spherical nanoparticles has been investigated, their excitation and photoluminescence spectra have been analyzed, and the lifetime of the $^5D_0$ excited state of Eu$^{3+}$ ions has been considered. It has been found that the luminescence decay time for spherical particles increases by a factor of 1.39 compared to that for a powdered phosphor Lu$_2$O$_3$ : Eu (5 at%) prepared and treated under the same temperature conditions as the Lu$_2$O$_3$ : Eu (5 at%) spherical particles. This effect has been associated with the change in the photonic local density of states in spherical optical cavities consisting of particles of the phosphor.

Received: 28.02.2011

 English version: Physics of the Solid State, 2011, 53:9, 1895–1901

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