Light harvesting and energy transfer in multiporphyrin-modified CdSe nanoparticles.
Multiporphyrin-modified CdSe nanoparticles (CdSe-H2P) were prepared to elucidate the interaction between chromophores and luminescent semiconducting nanoparticles in the excited and ground states. The CdSe-H2P nanoparticles were obtained by place-exchange reactions of hexadecylamine-thiophenol-modified CdSe nanoparticles with porphyrin alkanethiols in toluene. The number of porphyrin molecules on the surface of a single CdSe nanoparticle increased with increasing reaction time to reach a saturated maximum of 21. The porphyrins as well as the core in CdSe-H2P can absorb UV/Vis radiation. Steady-state emission and emission-lifetime measurements reveal efficient energy transfer from the CdSe excited state to the porphyrins in the CdSe-H2P nanoparticles. The resulting porphyrin excited singlet state is not quenched by the CdSe core. These unique properties are in sharp contrast with those of multiporphyrin-modified metal and silica nanoparticles. Thus, semiconducting nanoparticle-multiporphyrin composites are highly promising as novel artificial photosynthetic materials.
Kang
Soonchul
S
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
Yasuda
Masakazu
M
Miyasaka
Hiroshi
H
Hayashi
Hironobu
H
Kawasaki
Mitsuo
M
Umeyama
Tomokazu
T
Matano
Yoshihiro
Y
Yoshida
Kaname
K
Isoda
Seiji
S
Imahori
Hiroshi
H
D000042:Absorption; D019187:Cadmium Compounds / Q000737:chemistry*; D004579:Electron Transport; D004735:Energy Transfer; D005453:Fluorescence; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D010777:Photochemistry; D011166:Porphyrins / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors; D012993:Solar Energy; D014466:Ultraviolet Rays
D019187:Cadmium Compounds; D011166:Porphyrins; D018036:Selenium Compounds; C058667:cadmium selenide