TITLE

Photoluminescence induced by thermal annealing in SrTiO3 thin film

AUTHOR(S)
Rho, JaeHoon; Jang, SeungHun; Ko, Young Dong; Kang, SeungJin; Kim, Dong-Wook; Chung, J.-S.; Kim, Miyoung; Han, Moonsup; Choi, Eunjip
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p241906
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have grown SrTiO3 thin films by rf-sputtering and studied its photoluminescence (PL) property after postannealing treatments. While the as-grown film does not show any PL signal, visible frequency PL emissions are induced by high temperature (T>550 °C) annealing. When subsequent low-T (50 °C) and long term (>8 months) annealing was made, the PL-spectra evolved into another pattern in which four distinct luminescence peaks appear simultaneously at λ=1.8, 2.2, 2.7, and 3.1 eV. We propose that these remarkable room temperature PL effects are due to both metastable and energetically stabilized defect states formed inside the band gap.
ACCESSION #
47039166

 

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