Photoluminescence induced by thermal annealing in SrTiO3 thin film

Jaehoon Rho, Seunghun Jang, Young Dong Ko, Seungjin Kang, Dong Wook Kim, J. S. Chung, Miyoung Kim, Moonsup Han, Eunjip Choi

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish
Article number241906
JournalApplied Physics Letters
Issue number24
StatePublished - 14 Dec 2009


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