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Title: Band-to-band photoluminescence in SrTiO_{3}
Authors: Yamada, Yasuhiro  KAKEN_id
Kanemitsu, Yoshihiko  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 山田, 泰裕
金光, 義彦
Issue Date: Sep-2010
Publisher: The American Physical Society
Journal title: Physical Review B
Volume: 82
Issue: 12
Thesis number: 121103(R)
Abstract: We report the observation of band-edge photoluminescence (PL) in highly photoexcited SrTiO3 and electron-doped SrTiO3 at low temperatures. Two band-edge PL peaks coincide with the low- and high-temperature onsets of optical absorption. This clearly shows that band-edge PL peaks correspond to indirect band-to-band radiative recombination involving phonon emission and absorption processes and allows a determination of the band gap. The PL peaks redshift with increasing carrier density, indicating band-gap shrinkage. The temperature dependence of the band-edge PL and optical absorption spectra are also discussed in conjunction with phonon-assisted optical transitions.
Rights: © 2010 The American Physical Society
DOI(Published Version): 10.1103/PhysRevB.82.121103
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