Nayak, A and Sahoo, R and Debnath, Radhaballabh (2007) Hydration-induced coupling of the excitonic state of Y2O3 with its phonon: Negative effect on the luminescence efficiency of Y2O3 : Eu+3 nanophosphor. Journal of Materials Research, 22 (1). pp. 35-39. ISSN 0884-2914

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Abstract

Luminescence properties of a series of samples of Y2O3:Eu+3 red phosphor of particle sizes ranging from 50 to 300 nm were investigated as a function of time to decipher the long-standing mystery of the effect of reduction of particle size on the luminescence efficiency of the phosphor. The samples were found to lose luminescence efficiency and suffer a change in the excitation profile with time. Infrared studies showed that although the samples at their freshly prepared stage were almost free from contaminated water, on aging in air at room temperature, they absorbed the latter. The phenomenon of hydration-induced coupling of the excitonic state of Y2O3 with one of its F-u modes was detected in the case of the aged sample, which was shown to be instrumental in introducing newer nonradiative channels in the system. Because of larger surface-to-volume ratio, the effect was most pronounced in the case of nanocrystalline samples.

Item Type:	Article
Subjects:	Physical Properties
Divisions:	Glass
Depositing User:	Namita Dutta
Date Deposited:	24 Jan 2012 10:10
Last Modified:	15 Feb 2017 07:22
URI:	http://cgcri.csircentral.net/id/eprint/514

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