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Photoluminescence Variation With Temperature in ZnO:Ag Nanorods obtained by Ultrasonic Spray Pyrolysis

Published online by Cambridge University Press:  19 November 2013

E. Velázquez Lozada ,
S. Mera Luna  and
L. Castañeda
E. Velázquez Lozada*
Affiliation:
ESIME – Instituto Politécnico Nacional, México D.F. 07738, México.
S. Mera Luna
Affiliation:
ESIQE – Instituto Politécnico Nacional, México D.F. 07738, México.
L. Castañeda
Affiliation:
ESIME – Ticomán – Instituto Politécnico Nacional, México D.F. 07340, México.
*
*Email: [email protected]
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Abstract

The photoluminescence, its temperature dependences, as well as structural characteristics obtained by the method of Scanning electronic microscopy (SEM) have been studied in ZnO:Ag nanorods prepared by the ultrasonic spray pyrolysis (USP). PL spectra of ZnO:Ag NRs in the temperature range from 10 K to 300 K are investigated. Three types of PL bands have been revealed: i) the near-band-edge (NBE) emission, ii) defect related emission and iii) IR emission. It is shown that IR emission corresponds to the second-order diffraction of near-band-edge (NBE) emission bands. The study of NBE PL temperature dependences reveals that the acceptor bound exciton (ABE) and its second-order diffraction peak disappeared at the temperature higher than 200 K. The attenuation of the ABE peak intensity is ascribed to the thermal dissociation of ABE with appearing a free exciton (FE). The PL bands, related to the LO phonon replica of FE and its second-order diffraction, dominate in the PL spectra at room temperature that testify on the high quality of ZnO:Ag films prepared by the USP technology.

Keywords

luminescenceZnO:Agnanorods
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1617: Symposium 7E – Low-Dimensional Semiconductor Structures , 2013 , pp. 113 - 117
Copyright
Copyright © Materials Research Society 2013 

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