Dynamical Studies of Color Sensitization in Photography

摄影色彩敏化的动态研究

• 批准号: 12640554
• 负责人: YOSHIHARA Keitaro
• 金额: $ 1.98万
• 依托单位: Japan Advanced Institute of Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640554/
• 关键词: spectral sensitization; photography; AgBr; electron injection; energy transfer; ultrafast spectroscopy; super-sensitization; fluorescence measurement; 分光増感; 電子移動; 銀塩; 色素増感; 結晶系; 色増感; フェムト秒分光; 吸着色素; 蛍光寿命

Spectral sensitization and supersensitization of the silver bromide nanocrystals were studied in the femtosecond timescale for the first time. An annihilation-free fluorescence from J-aggregates of dye 1 adsorbed on the silver bromide nanocrystals (edge to edge distance from 40 to 900 nm) of different shapes (cubic and octahedral) was measured [1]. Very fast non-exponential fluorescence decays were observed with a fast component from 0.4 to 2.5 ps, and an average decay time from 1.1 to 5.5 ps, depending on the type and size of AgBr grains. The average fluorescence decay time is several times longer on the cubic grains than that on the octahedral grains.By time-resolved fluorescence anisotropy measurement the ultrafast excitation-energy transfer of the J-aggregates on the octahedral AgBr microcrystal is studied [2]. The anisotropy decays are biphasic with two time constants of 〜0.15 ps and 2-7 ps. The short time constant is almost independent of the dye coverage, while the second one becomes slower at higher dye coverages. An ultrafast excitation transfer (O.1ps) is suggested to take place between epitaxially arranged J-aggregates on the {111} surface prior to the primary electron injection to AgBr (0.7 ps).

首次在飞秒尺度上研究了溴化银纳米晶体的光谱敏化和超敏化。在不同形状（立方体和八面体）的溴化银纳米晶体（边沿距离为40 ~ 900 nm）上吸附了染料1的j -聚集体的无湮灭荧光。根据AgBr晶粒的类型和大小，观察到非常快的非指数荧光衰减，快速成分为0.4 ~ 2.5 ps，平均衰减时间为1.1 ~ 5.5 ps。立方颗粒的平均荧光衰减时间是八面体颗粒的数倍。通过时间分辨荧光各向异性测量，研究了八面体AgBr微晶体上j -聚集体的超快激发-能量转移。各向异性衰减是双相的，时间常数为~ 0.15 ps和2 ~ 7 ps，短时间常数几乎与染料覆盖率无关，而在染料覆盖率较高时，第二个时间常数变慢。在一次电子注入AgBr （0.7 ps）之前，在{111}表面外延排列的j -聚集体之间发生了超快的激发转移（0.1 ps）。

项目成果

J-W.Oh, S.Kumazaki, I.V.Rubtsov, T.Suzumoto, T.Tani, K.Yoshihara: "Ultrafast energy transfer in J-aggregate on AgBr microcrystals : its dependence on dye coverage"Chem. Phys. Lett.. 352. 357-362 (2002)

J-W.Oh、S.Kumazaki、I.V.Rubtsov、T.Suzumoto、T.Tani、K.Yoshihara：“AgBr 微晶上 J 聚集体的超快能量转移：其对染料覆盖率的依赖性”Chem。

I. V. Rubtsov, K. Ebina, F. Satou, J-W. Oh, S. Kumazaki, T. Suzumoto, T. Tani, K. Yoshihara: "Spectral Sensitization and Supersensitization of AgBr Nanocrystals Studied by Ultrafast Fluorescence Spectro-scopy"J. Phys. Chem. A. 106. 2795-2802 (2002)

I. V. Rubtsov、K. Ebina、F. Satou、J-W。

I.V.Rubtsov, K.Ebina, F.Satou, J-W.Oh, S.Kumazaki, T.Suzumoto, T.Tani, K.Yoshihara: "Spectral Sensitization and Supersensitization of AgBr Nanocrystals Studied by Ultrafast Fluorescence Spectroscopy"J. Phys. Chem. A. 106. 2795-2802 (2002)

I.V.Rubtsov、K.Ebina、F.Satou、J-W.Oh、S.Kumazaki、T.Suzumoto、T.Tani、K.Yoshihara：“超快荧光光谱研究的 AgBr 纳米晶体的光谱敏化和超敏化”J。

I.V.Rubtsov, K.Ebina, K.Yoshihara, J.Knoester, T.suzumoto, T.Tani: "Spectral Sensitization, Supersensitization and Ultrafast Exciton Migration on AgBr Semiconductor Surface"Ultrafast Phenomena XII, Springer-Verlag, Berlin. 12. 445-446 (2000)

I.V.Rubtsov、K.Ebina、K.Yoshihara、J.Knoester、T.suzumoto、T.Tani：“AgBr 半导体表面上的光谱敏化、超敏化和超快激子迁移”超快现象 XII，Springer-Verlag，柏林。

J-W. Oh, S. Kumazaki, I. V. Rubtsov, T. Suzumoto, T. Tani and K. Yoshihara: "Ultrafast energy transfer in J-aggregate on AgBr microcrystals: its dependence on dye coverage"Chem. Phys. Lett.. 352. 357-362 (2002)

J-W。