Saha Chowdhury, Paramita and Patra, Amitava (2006) Role of dopant concentration and surface coating on photophysical properties of CdS : Eu3+ nanocrystals. Physical Chemistry Chemical Physics, 8 (11). pp. 1329-1334. ISSN 1463-9076

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Abstract

Here, we report the role of dopant concentration and surface coating of CdS: Eu3+ nanocrystals on the modification of crystal structure and their photoluminescence properties by steady-state and time resolved fluorescence studies. It is found that photoluminescence properties are sensitive to the crystal structure which is controlled by surface coating and dopant concentration. The emission intensity of the peak at 614 nm (5D0 → 7F2) of the Eu3+-ions is found to be sensitive to the doping and surface coating of CdS nanocrystals. It is found that the average decay times 〈τ〉 are 248, 353 and 499 μs for 0.25, 0.5 and 1.0 mol% Eu ions doped into CdS nanocrystals, respectively. From the decay time measurements, it is evident that the energy transfer occurs from CdS nanoparticles to Eu3+ ions and the calculated energy transfer efficiency from CdS nanoparticles to Eu3+ ions is 9.2 and 35% for Eu3+ ions coated and doped CdS nanoparticles, respectively. Our analysis suggests that site symmetry of ions plays a very important role in the modifications of radiative and nonradiative relaxation mechanisms.

Item Type:	Article
Subjects:	Physical Properties
Divisions:	UNSPECIFIED
Depositing User:	Mrs Chandana Patra
Date Deposited:	01 Feb 2012 07:29
Last Modified:	01 Feb 2012 07:29
URI:	http://cgcri.csircentral.net/id/eprint/600

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