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).

首次在飞秒时间尺度上研究了银溴纳米晶体的光谱灵敏度和超敏化。从不同形状的溴化银纳米晶体（边缘到40至900 nm）上吸附的染料1的J凝集物的无an灭荧光[1] [1]。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，其快速分量从0.4到2.5 PS，平均衰减时间从1.1到5.5 ps。在立方晶粒上的平均荧光衰减时间比八面体晶粒的平均荧光时间长几倍。通过时间分辨的荧光各向异性测量，在八面体AGBR微晶体上研究了J-聚集物的超快兴奋 - 能量转移[2]。各向异性衰减是双相的，两个时间常数为〜0.15 ps和2-7 ps。短时常数几乎与染料覆盖范围无关，而第二个则在较高的染料覆盖范围内变慢。建议在{111}表面上的外延布置的J-聚集物之间进行超快兴奋转移（O.1ps），然后在对AGBR的初级电子注入（0.7 ps）之前进行。

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。