Search for oxides showing visible-light active photochromism and visible-induced structural change by Raman Spectroscopy.

通过拉曼光谱寻找具有可见光活性光致变色和可见光诱导结构变化的氧化物。

• 批准号: 13450264
• 负责人: KAKIHANA Masato
• 金额: $ 9.66万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450264/
• 关键词: Visible light; photochromism; light-induced structural change; Raman spectroscopy; resonance Raman scattering; oxide; 共鳴ラマン分光

The purpose of this study is to search for oxides showing structural changes or photochromisms under illumination of safe and cheap visible lights and to elucidate mechanisms of the phenomena. It was elucidated that the Y-based high-tc superconductor YBa_2Cu_3O_x underwent change in its structure upon visible-light illumination and that vanadium oxide V2Os exhibited visible-light photochromism-In this year, the light-switching process and the reversibility of these materials have been inestigated in details1.Light-induced structural change and light-switching process in YBa_2Cu_3aO_xIt was elucidated that when Raman spectra of YBa_2Cu_3O_x single crystals were measured under illumination of green laser with a wave length of 515nm, the intensities for defect-induced modes corresponding to CuO chains decreased with time and it was transfered to a metastable state. This state was recovered to the original state upon the illumination of a laser with a wavelength of 900nm. It has turned out that the light-induced structural change can occur reversibly by use of two different lights and it can be used as a light switch.2. Evaluation of the reversibility of visible-Light photochromism in vanadium oxidePolycrystalline V_2O_5 turns blue-black upon irradiation with visible laser light (515nm) in air due to photo reduction of V^<5+> The coloration was diminished when heated at 400℃, and the coloration-decoloration cycle was repeatable. In order to evaluate the reversibility of the visible-light photochromism in V_2O_5. photo luminescence (PL) spectra were measured. The sample was repeatedly irradiated and heated without irradiation. The PL intensity recovers during the rest upon heating and decays consistently during irradiation. This cycle can be repeated without significant degradation of the photochromic effect.

本研究的目的是寻找在安全且廉价的可见光照射下表现出结构变化或光致变色的氧化物，并阐明该现象的机制，阐明Y基高温超导体YBa_2Cu_3O_x在其结构上发生了变化。可见光照明和氧化钒V2Os表现出可见光光致变色——今年，光开关过程和可逆性1.YBa_2Cu_3aO_x的光致结构变化和光开关过程阐明了在波长为515nm的绿光激光照射下测量YBa_2Cu_3O_x单晶的拉曼光谱时,缺陷强度CuO 对应的诱导模式随时间减少链，并转变为亚稳态，该状态得到恢复。结果表明，在900nm波长的激光照射下，光引发的结构变化可以可逆地发生，并且可以用作光开关。2．氧化钒中可见光光致变色的可逆性多晶V_2O_5在空气中受到可见激光（515nm）照射时，由于光还原而变成蓝黑色V^<5+>在400℃加热时显色减弱，并且显色-脱色循环可重复。为了评价V_2O_5光致发光(PL)光谱的可逆性。样品在没有照射的情况下被反复照射和加热，PL强度在加热过程中恢复并在照射过程中持续衰减。光致变色效果。

项目成果

M. Kakihana: "Photoinduced effects and oxygen dynamics in YBa_2Cu_3Ox"Physica C. 364-365. 545-548 (2001)

M. Kakihana：“YBa_2Cu_3Ox 中的光致效应和氧动力学”Physica C. 364-365。

S.Nishio, M.Kakihana, H.Eba, K.Sakurai: ""Doughnut-shaped" coloration of V_2O_5 upon laser irradiation: another evidence of visible light photochromism of V_2O_5"Jpn. J. Appl. Phys.. 42. 5670-5671 (2003)

S.Nishio、M.Kakihana、H.Eba、K.Sakurai：“激光照射下 V_2O_5 的“环形”着色：V_2O_5 可见光光致变色的另一个证据”Jpn。

S.Nishio, M.Kakihana: "Evidence for visible light photochromism of V_2O_5"Chemistry of Materials. 14. 3730-3733 (2002)

S.Nishio，M.Kakihana：“V_2O_5 可见光光致变色的证据”材料化学。

S.Nshio, M.Kakihana: "五酸化バナジウムV_2O_5における可視光フォトクロミズム"現代化学. 8. 23-27 (2003)

S.Nshio，M.Kakihana：“五氧化二钒 V_2O_5 中的可见光光致变色”Gendai Kagaku。

M.Osada, M.Kakihana: "New functional properties of oxides by light-Light-incuced structural change and light-induced superconductivity in high-temperture superconducting oxides"Ceramic databook '02. 30[84]. 53-55 (2002)

M.Osada，M.Kakihana：“通过光实现氧化物的新功能特性-高温超导氧化物中的光诱导结构变化和光诱导超导性”陶瓷数据手册02。