Singh, Vijay and Naidu, D T and Chakradhar, R P S and Ratnakaram, Y C and Zhu, Jun-Jie and Soni, Manish (2008) Synthesis, characterization and optical properties of LaAlO(3):Ho(3+) phosphor. Physica B-Condensed Matter, 403 (19-20). pp. 3781-3785. ISSN 0921-4526

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Abstract

Holmium-doped lanthanum aluminate (LaAlO(3)) powder phosphors have been prepared at furnace temperatures as low as 500 degrees C by using the combustion route without further calcining treatment. Powder X-ray diffraction and Fourier-transform infrared spectrometry measurements were used to characterize the prepared combustion products, while the optical properties were studied using UV-vis-NIR and photoluminescence spectroscopy. The Judd-Ofelt (J-O) model was applied to obtain the oscillator strengths (f) and three phenomenological intensity parameters. Using J-O parameters (Omega(2), Omega(4) and Omega(6)) the radiative transition probabilities (A(ab)), radiative lifetimes (tau(R)) and branching ratios have been calculated for certain excited states of Ho(3+). Using the Fuchtbauer-Ladenberg formula, the stimulated emission cross-sections (sigma(emi)) for some interesting transitions, such as (5)S(2) -> (5)I(8) and (5)F(8) -> (5)I(8) of Ho(3+) in LaAlO(3), were determined and discussed. (C) 2008 Published by Elsevier B.V.

Item Type:	Article
Uncontrolled Keywords:	Combustion; Phosphor; HO(3+) ions; XRD; FTIR; Optical properties
Subjects:	Physical Properties Glass
Divisions:	Glass
Depositing User:	Bula Ghosh
Date Deposited:	23 Jan 2012 06:28
Last Modified:	13 Mar 2012 05:30
URI:	http://cgcri.csircentral.net/id/eprint/476

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