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.

这项研究的目的是寻找在安全和廉价的可见光照明下显示结构变化或光更色素的氧化物，并阐明现象的机制。已经阐明了，基于Y的高-TC超导体YBA_2CU_3O_X在可见光照明时发生了变化，并且今年暴露于今年的可见光光色中，含有可见光的光色含量，这些材料的轻度切换过程和这些材料的可逆性在详细范围内变得更改。阐明YBA__2CU_3AO_XIT是在YBA_2CU_3O_X的拉曼光谱下在绿色激光器的照明下测量的，波长为515nm时，与时间和时间随时间和IT降低的缺陷诱导模式相对应的缺陷诱导模式的强度转移到了可转移的状态。原始状态在光线（波长为900nm）的激光照明后。事实证明，光引起的结构变化可以通过使用两个不同的灯可逆地发生，并且可以用作光开关。2。评估可见光光色素在氧化物氧化物氧化物氧化物丙烯晶体中的可逆性V_2O_5在辐射后用可见的激光光（515nm）在空气中变成蓝光，这是由于降低V^<5+>的颜色减少了，当颜色减少时，当400 decoloration Cypor-Decelecor循环降低了颜色。为了评估v_2o_5中可见光光色的可逆性。测量照片发光（PL）光谱。将样品反复辐照并加热而没有辐照。 PL强度在加热时在其余的过程中恢复，并在辐照过程中持续腐烂。可以重复此循环，而不会显着降解光致变色效应。

项目成果

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。

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.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。

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。

M.Osada, M.Kakihana: "光でつくる酸化物の新機能-酸化物高温超伝導体の光誘起構造変化と光誘起超伝導-"セラミックデータブック'02. 30[84]. 53-55 (2002)

M.Osada，M.Kakihana：“光生氧化物的新功能 - 氧化物高温超导体的光致结构变化和光致超导性 -”陶瓷数据手册 02[84]。