Ultraviolet and visible photoluminescence from aluminate crystals with perovskite structure

Yutaka Kawabe; Akio Yamanaka; Eiichi Hanamura; Tsuyoshi Kimura; Yoshinori Tokura; Yoshihiro Takiguchi; Hirofumi Kan

doi:10.1117/12.405278

25 October 2000 Ultraviolet and visible photoluminescence from aluminate crystals with perovskite structure

Yutaka Kawabe, Akio Yamanaka, Eiichi Hanamura, Tsuyoshi Kimura, Yoshinori Tokura, Yoshihiro Takiguchi, Hirofumi Kan

Proceedings Volume 4102, Inorganic Optical Materials II; (2000) https://doi.org/10.1117/12.405278
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Strong photoluminescence was observed from nominally pure lanthanum aluminate crystals and related materials with perovskite structure in a visible and ultraviolet wavelength regions. Single crystals of RAlO₃ (R equals La, Y, Nd, Sm) were grown with a floating-zone method in reduced atmosphere. Photoluminescence from as-grown LaAlO₃ single crystals was composed of a fast ultraviolet component and a broad visible emission. From the lifetime measurement, absorption spectra, excitation spectrum, and comparison between samples as-grown and annealed in oxygen, we assigned the visible component to the emission from excited state formed at oxygen defect sites because the emission was strongly suppressed with oxidation. On the other hand, the UV emission was assigned to band-to-band emission or emission from polaron pairs. Similar two components were observed in YAlO₃ crystals at longer wavelength region than in LaAlO₃. Fast UV emission was observed also in NdAlO₃ and SmAlO₃. Because it is possible to make some perovskite crystals electrically conductive by varying the concentration of dopants, the combination of luminescence and electrical conductivity in perovskite oxides make them auspicious materials for novel optoelectronic devices. Our results show the possibility of light-emitting devices made of perovskite aluminate crystals.

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Yutaka Kawabe, Akio Yamanaka, Eiichi Hanamura, Tsuyoshi Kimura, Yoshinori Tokura, Yoshihiro Takiguchi, and Hirofumi Kan "Ultraviolet and visible photoluminescence from aluminate crystals with perovskite structure", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); https://doi.org/10.1117/12.405278

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