Photoelectric properties based on photo-induced electron transfer processes in flavin–porphyrin hetero-type Langmuir–Blodgett films

Electric-Field-Induced Fluorescence Quenching in a Metal-Insulator-Metal Device Composed of Flavin-Porphyrin Hetero-Type Langmuir-Blodgett Films

“…As shown in the figure, the fluorescence quenching was found to be slow and it did not attain a steady state within one minute. In the earlier paper, 9) we reported that the time constant for the CS process in the MHJ device was of a sub-nanosecond order. The slow rate of the electric-fieldinduced fluorescence quenching indicates that the increase in the rate of the CS process is not involved in the quenching process.…”

“…In previous papers, we reported that the metalinsulator-metal (MIM) device composed of flavin-porphyrin hetero-type LB films (MHJ device) showed highly efficient photoelectric properties mainly attributable to the fast charge separation (CS) process of which time constant is a subnanosecond order and the photocurrent showed the rectifying behavior. [7][8][9] In this paper, the photoinduced ET processes are discussed in terms of the dependence of the flavin fluorescence on the electric field.…”

“…A detailed description of the preparation method and the fundamental characteristics of the LB monolayers are found in a previous paper. 9) The structural characteristics of the flavin-porphyrin MHJ is shown in Fig. 1(b).…”

Nano-structure of polyimide and poly(isobutyl methacrylate) monolayer films studied by interlayer electron transfer between porphyrin and pyromellitic diimide moieties

“…In the photosynthesis of plants, photo-electron conversion occurs efficiently owing to the spatial location and orientation of the redox species, which are precisely regulated by the surrounding proteins in nanometer scale [2]. So far, many researchers have attempted to realize the highly efficient photo-electron conversion by mimicking the photosynthetic system with LB films [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Spectroscopic and optical characterization of porphyrin chromophores incorporated into ultrathin polyimide films

“…So far, many attempts have been made to realize the artificial highly efficient photoenergy conversion systems by using molecular arrays [3][4][5][6][7][8][9][10], dendrimer [11,12], self-assembled monolayers (SAM) [13,14], and LB films [15][16][17][18][19][20][21][22][23][24][25]. Among these systems, the LB film is a promising candidate because of its well-defined nanostructure and wide choice of suitable chemicals from a huge number of organic materials.…”