Blue luminescence from electron-doped SrTiO3
Blue luminescence from electron-doped SrTiO3
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DOI：
10.1063/1.2202750
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发表时间：
2006-05
影响因子：
4
通讯作者：
D. Kan;Ryoko Kanda;Y. Kanemitsu;Y. Shimakawa;M. Takano;T. Terashima;A. Ishizumi
中科院分区：
文献类型：
--
作者：
D. Kan;Ryoko Kanda;Y. Kanemitsu;Y. Shimakawa;M. Takano;T. Terashima;A. Ishizumi
在室温下观察到电子掺杂SrTiO 3单晶的蓝光发射。用La 3+取代Sr 2+，用Nb 5+取代Ti4+，在Ti 3d导带中提供电子载流子，这些载流子是室温蓝光发射的主要原因。这种蓝光发射基本上与Ar+照射的缺氧SrTiO 3中观察到的相同。这种蓝色发光与缺陷类型无关。La ~（3+）对Sr ~（2+）的化学取代改变了结构相变的温度，使其从立方对称转变为四方对称。讨论了光致发光性质与结构相变的关系。
Blue-light emissions from electron-doped SrTiO3 single crystals at room temperature were observed. Substituting La3+ for Sr2+ and Nb5+ for Ti4+ in SrTiO3 provides electron carriers in Ti 3d conduction bands; these carriers are responsible for the room-temperature blue-light emission. This blue-light emission is essentially the same as that observed in Ar+-irradiated oxygen-deficient SrTiO3. This blue luminescence is independent of the defect type. The chemical substitution of La3+ for Sr2+ changes the temperature of the structural phase transition from cubic to tetragonal symmetry. The relation between the photoluminescence properties and the structural phase transition is also discussed.