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首页> 外文期刊>Materials Letters >Photoluminescence of nanosized Na_(0.5)Bi_(0.5)TiO_3 synthesized by a sol-gel process
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Photoluminescence of nanosized Na_(0.5)Bi_(0.5)TiO_3 synthesized by a sol-gel process

机译：溶胶-凝胶法合成纳米Na_（0.5）Bi_（0.5）TiO_3的光致发光

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摘要

Nanosized Na_(0.5)Bi_(0.5)TiO_3 powder of particle size of about 45 85 nm was prepared by a sol - gel method. Photoluminescence measurement showed that there was a blue shift from 440.2 to 445.3 nm in the principal emission peak of the nanosized powder with decreasing particle size, while the intensity of the emission increased. A self-trapped excitation might be responsible for the visible emission band observed, and this blue shift in the principal emission peak could be ascribed to distortion of TiO_6 octahedra (due to the surface stress of Na_(0.5)Bi_(0.5)TiO_3 crystallite) and the dielectric confinement effect.
机译：通过溶胶-凝胶法制备了粒径约为45 85 nm的纳米级Na_（0.5）Bi_（0.5）TiO_3粉末。光致发光测量表明，随着粒度减小，纳米尺寸粉末的主发射峰从440.2nm到445.3nm发生蓝移，而发射强度增加。自陷激发可能是观察到的可见发射带的原因，主发射峰的这种蓝移可能归因于TiO_6八面体的变形（由于Na_（0.5）Bi_（0.5）TiO_3晶体的表面应力）以及介电限制效应。

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