Letter abstract
Nature Materials 4, 816 - 819 (2005)
doi:10.1038/nmat1498
Subject Categories: Ceramics | Optical, photonic and optoelectronic materials
Blue-light emission at room temperature from Ar+-irradiated SrTiO3
Daisuke Kan1, Takahito Terashima1,2, Ryoko Kanda1, Atsunobu Masuno1, Kazunori Tanaka3, Shucheng Chu3, Hirofumi Kan3, Atsushi Ishizumi4, Yoshihiko Kanemitsu1,4, Yuichi Shimakawa1 and Mikio Takano1
Oxide-based electronic devices are expected to have fascinating properties, unlike those made from conventional semiconductors. SrTiO3 (STO) is a key material for this new field of electronics1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. Here we report on blue-light emission at room temperature from Ar+-irradiated, metallic STO. The irradiation introduces oxygen deficiencies to a depth of 
20 nm from the crystal surface. These deficiencies generate conduction carriers and stabilize a hole level in a self-trapped state. We propose a model by which the doped conduction electrons and the in-gap state produce a radiative process that results in blue-light emission. The emitting region can be patterned into any size and shape with conventional microscopic fabrication techniques.
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Uji, Kyoto 611-0011, Japan
- Central Research Laboratory, Hamamatsu Photonics K. K., Hamakita, Shizuoka 434-8601, Japan
- Graduate School of Materials Science, Nara Institutes of Science and Technology, Ikoma, Nara 630-0192, Japan
Correspondence to: Daisuke Kan1 e-mail: daisuke@msk.kuicr.kyoto-u.ac.jp
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