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.

如果光致电子转移与自由基对的新吸收带相结合，切断光束，则可以实现无源光开关。当电子转移过程伴随着光发射时，应观察到主动开关。(1)通过使用紫精作为电子受体（A）研究了由于光生自由基对引起的瞬态吸收。卟啉或吩噻嗪单元是电子供体（D）。当D和A相互保持在1.5nm内时，容易产生自由基对。自由基对的寿命为几微秒，但在0.3T以上的外磁场存在下，它可以很容易地延长到10微秒。光生自由基对促进分子络合。由于自由基对的瞬态吸收可以用来构造无源开关元件。(2)光学二次谐波产生（SHG）观察到使用的两亲钌配合物纳入LB膜。金属到配体的电荷转移态（MLCT）负责SHG。激光激发ML CT跃迁时，532 nm处的二次谐波强度显著降低。这是第一次观测到倍频光强度的光调制。主动切换应借助于这种现象来实现。

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)

T.Matsuo(分担執筆): "Photochemical Processes in Organized Molecular Systems" NorthーHolland, 538 (1991)

T.Matsuo（贡献者）：“组织分子系统中的光化学过程”North-Holland，538 (1991)

H. Nakamura: "Photoionization of Phenothiazinyl and (Carbazolylalkyl) Trimethylammonium Bromides in Frozen AOT Reversed Micellar Solutions Studied by Electron Spin Echo Modulation and Electron Spin Resonance." J. Phy. Chem.95. 1480-1484 (1991)

H. Nakamura：“通过电子自旋回波调制和电子自旋共振研究冷冻 AOT 反胶束溶液中吩噻嗪基和（咔唑基烷基）三甲基溴化铵的光电离。”