Journal
JOURNAL OF APPLIED PHYSICS
Volume 87, Issue 10, Pages 7594-7596Publisher
AMER INST PHYSICS
DOI: 10.1063/1.373428
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Photoluminescence was observed from pure perovskite lanthanum aluminate (LaAlO3) single crystals grown with a floating-zone method in reduced atmosphere. Emission was composed of a fast ultraviolet (UV) component and a broad visible emission with a lifetime of 13 mu s. From the lifetime measurement, absorption spectra, excitation spectrum, and comparison between samples as-grown and annealed in oxygen, we assigned the UV emission to band-to-band emission or emission from polaron pairs. The visible component was assigned to emission from the excited state formed at oxygen defect sites. These emissions demonstrate the possibility of light-emitting devices made of perovskite oxides. (C) 2000 American Institute of Physics. [S0021-8979(00)00210-3].
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