Development of Optical Switching Elements by the Use of Donor-Acceptor Linked Compounds

利用供体-受体连接化合物开发光开关元件

• 批准号: 02453080
• 负责人: MATSUO Taku
• 金额: $ 3.78万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02453080/
• 关键词: Donor-Acceptor Linked System; Ruthenium Polypyridine Complex; Optical Second Harmonic Generation (SHG); Electron-Transfer; Langmuir-Blodgett Film; Magnetic Field Effects; 表面吸着; 光誘起電子移動; DonorーAcceptor結合系

Passive optical switching will be achieved, if photoinduced electron-transfer is associated with a new absorption band of a radical pair to cut off a light beam. Active switching should be observed, when the electrontransfer process is accompanied by light emission.(1) Transient absorption due to photogenerated radical pairs was investigated by the use of viologen as the electron acceptor (A). Either porphyrin or phenothiazine unit was the electron donor (D). The radical pair was easily generated, when the D and A were held each other within 1.5 nm. The lifetime of the radical pair was a few microseconds, but it could be easily extended up to 10 microseconds in the presence of external magnetic fields above 0.3 T. Photogeneration of the radical pairs was facilitated by molecular complexation. Transient absorption due to the radical pair could be used to construct passive switching elements.(2) Optical Second-Harmonic Generation (SHG) was observed by the use of amphiphloic ruthenium complexes incorporated into LB films. Metal to ligand charge-transferred state (MLCT) was responsible to the SHG. The intensity of the SHG at 532 nm could be remarkably reduced on laser excitation of the ML CT transition. This is the first observation of optical modulation of SHG intensity. Active switching should be achieved by virtue of this phenomenon.

如果光诱导的电子转移与一个自由基对的新吸收带相关联，将实现被动光学开关，以切断光束。当电子传输过程伴随着光发射时，应观察到主动切换。（1）通过使用Viologen作为电子受体（a），研究了由于光生的自由基对引起的瞬时吸收。卟啉或苯噻嗪单元是电子供体（D）。当D和A彼此在1.5 nm之内相互保持时，很容易产生激进对。自由基对的寿命是几微秒，但是在存在于0.3 t以上的外部磁场的情况下，可以很容易地将其延长至10微秒。通过分子络合，可以促进自由基对的光生成。由于自由基对引起的瞬时吸收可用于构建被动开关元件。（2）通过使用掺入LB膜中的两亲族鲁森综合体观察到光学第二谐波生成（SHG）。金属到配体电荷转让状态（MLCT）负责SHG。在ML CT转变的激光激发时，SHG在532 nm处的强度可能会大大降低。这是对SHG强度的光学调制的首次观察。主动切换应通过这种现象来实现。

项目成果

P. Baglioni: "Electron Spin Echo Modulation Study of AOT Reverse Micelles." J. Phy. Chem.95. 3856-3859 (1991)

P. Baglioni：“AOT 反胶束的电子自旋回波调制研究”。

P.Baglioni: "Electron Spin Echo Modulation Study of AOT Reverse Micelles" J.Phys.Chem.Vol.95. 3856-3859 (1991)

P.Baglioni：“AOT 反胶束的电子自旋回声调制研究”J.Phys.Chem.Vol.95。

H.Yonemura: "Magnetic Field Effects on Photoinduced Electron-Transfer and the Succeeding Processes in Phenothiaine-Viologen Linked Compounds Incorporated into Cyclodextrins or Reversed Micelles" Chem.Phys.(1992)

H.Yonemura：“磁场对光诱导电子转移的影响以及掺入环糊精或反胶束的吩噻因-紫罗碱连接化合物的后续过程”Chem.Phys.(1992)

H. Sakaguchi: "Laser-Induced Modulation of Second-Harmonic Light Emision from Ru (II)-Bipyridine Metal Complex in Langmuir-Blodgett Film." Jpn. J. Appl. Phys.30. L377-L379 (1991)

H. Sakaguchi：“Langmuir-Blodgett 薄膜中 Ru (II)-联吡啶金属配合物的二次谐波光发射的激光诱导调制”。

H.Sakaguchi: "Laser-Induced Modulation of Second-Harmonic Light Emission from Ru(II)-Bipyridine Metal Complex in Lagmuir-Blodgett Film" Jpn.J.Appl.Phys.Vol.30. L377-L379 (1991)

H.Sakaguchi：“Lagmuir-Blodgett 薄膜中 Ru(II)-联吡啶金属配合物的二次谐波光发射的激光诱导调制”Jpn.J.Appl.Phys.Vol.30。