Rapid energy transfer in light-harvesting small dendrimers

• Published in: Journal of luminescence Vol. 112; no. 1; pp. 449 - 453
• Main Authors: Akai, I., Nakao, H., Kanemoto, K., Karasawa, T., Hashimoto, H., Kimura, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-2005
• Subjects: Energy transfer; Förster mechanism; Photoluminescence; Short-range interaction; 36.20.−r; 82.20.Rp; Photoluminescence; 33.50.Dq; Light-harvesting dendrimer; Short-range interaction; 36.20.Kd; Förster mechanism; Energy transfer
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2004.09.070

The energy-transfer dynamics from peripheries to cores was investigated in two series of light-harvesting small dendrimers. In a star-shaped stilbenoid phthalocyanine having
π
-conjugated peripheries, a highly efficient and rapid energy transfer occurs. The core photoluminescence (PL) of a phenylene-based dendrimer, which has the effective overlap between the periphery PL and the core-absorption spectra, gives rise to a faster rise time than the periphery PL decay time. In these small dendrimers, it was found that short-range interactions caused by the wave function overlap between peripheries and cores become important, in which a rapid relaxation from the Frank–Condon states in the peripheries should be responsible for the rapid energy transfer.