Authors: Shukla, R.¹; Ningthoujam, R.S.¹; Tyagi, A.K.¹; Vatsa, R.K.²

Source: International Journal of Nanotechnology, Volume 7, Numbers 9-10, 2010 , pp. 843-851(9)

Publisher: Inderscience Publishers

Abstract:

Dy<SUP align=right>3&#43;</SUP> doped Gd<SUB align=right>2O<SUB align=right>3 nanoparticles were prepared by glycine-nitrate combustion route and their luminescence properties have been investigated. Through host lattice absorption at 230 nm, emission peaks at 488 (<SUP align=right>4</SUP>F<SUB align=right>9&#47;2 → <SUP align=right>6</SUP>H<SUB align=right>15&#47;2, blue-green) and 572 nm (<SUP align=right>4</SUP>F<SUB align=right>9&#47;2 → <SUP align=right>6</SUP>H<SUB align=right>13&#47;2, yellow) of Dy<SUP align=right>3&#43;</SUP> are observed along with a broad emission peak at 400 nm (host). Luminescence intensity increases with increase of heat-treatment from 500&#176;C to 900&#176;C due to extent of reduction of particle surface defect. On increasing the concentration from 1 to 2 at.&#37; Dy<SUP align=right>3&#43;</SUP>, luminescence intensity increases slightly and decreases with further increase of Dy<SUP align=right>3&#43;</SUP> due to cross-relaxation among Dy<SUP align=right>3&#43;</SUP> ions. This was supported by lifetime studies. Lifetimes for <SUP align=right>4</SUP>F<SUB align=right>9&#47;2 level of Dy<SUP align=right>3&#43;</SUP> in 1, 2 and 5 at.&#37; Dy<SUP align=right>3&#43;</SUP> doped Gd<SUB align=right>2O<SUB align=right>3 prepared at 900&#176;C were found to be 237, 39 and 26 μs, respectively.

Keywords: SCIENCE, ENGINEERING AND TECHNOLOGY; Materials and Manufacturing; Nanoscience and Nanotechnology

Document Type: Research article

DOI: http://dx.doi.org/10.1504/IJNT.2010.034692

Affiliations: 1: Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. 2: Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

Publication date: 2010-08-01

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