Luminescence of tetraphenylporphyrin by an energy transfer from photoexcited ZnO nanoparticle

Hiromitsu I; Kawami A; Tanaka S; Morito S; Sasai R; Ikeue T; Fujita Y; Handa M

Chemical Physics Letters, Vol.501, No.4-6, 385-389, 2011

DOI10.1016/j.cplett.2010.11.020 Export Citation

Luminescence of tetraphenylporphyrin by an energy transfer from photoexcited ZnO nanoparticle

Hiromitsu I, Kawami A, Tanaka S, Morito S, Sasai R, Ikeue T, Fujita Y, Handa M

Photoluminescence (PL) properties of meso-tetraphenylporphine-4,4'4 '',4'''-tetracarboxylic acid (H2TPP (COOH)(4)) bound to ZnO nanoparticle were studied. With 1.2 H2TPP(COOH)(4) molecules per ZnO particle, the PL intensity of H2TPP(COOH)(4) with a 325 nm excitation was increased to a 3.2-times larger value by the conjugate formation with ZnO. The excitation spectrum of PL gave an evidence of an emission of H2TPP(COOH)(4) by an energy transfer from ZnO. An analysis based on the Frster theory gave a reasonable value of 1.8 nm for the average distance between H2TPP(COOH)(4) and emissive surface defects on the ZnO particle. (C) 2010 Elsevier B. V. All rights reserved.