Harvesting infrared photons with croconate dyes

Takechi, Kensuke ; Kamat, Prashant V. ; Avirah, Rekha R. ; Jyothish, Kuthanapillil ; Ramaiah , Danaboyina (2008) Harvesting infrared photons with croconate dyes Chemistry of Materials, 20 (1). pp. 265-272. ISSN 0897-4756

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm7018668

Related URL: http://dx.doi.org/10.1021/cm7018668


Excited-state properties of the croconate dyes were investigated with an aim to utilize them as light harvesting assemblies in the infrared (IR) region (λmax 865 nm and M-1 c-1 = (1.4-4.2) × 105 M-1 s-1). The excited singlet of the monomeric dye quickly deactivates (lifetime 4-7 ps) without undergoing intersystem crossing to generate triplet. The triplet excited-state produced via triplet-triplet energy transfer method show relatively long life (lifetime 7.2 µs). The dye molecules when deposited as thin film on optically transparent electrodes or on nanostructured TiO2 film form H-aggregates with a blue-shifted absorption maximum around 660 nm. The excitons formed upon excitation of the dye aggregates undergo charge separation at the TiO2 and SnO2 interface. The H-aggregates in the film are photoactive and produce anodic current (IPCE of 1.2% at 650 nm) when employed in a photoelectrochemical cell. Spectroscopic and photoelectrochemical experiments that highlight the usefulness of croconate dyes in IR light harvesting applications are described.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:90865
Deposited On:14 May 2012 14:00
Last Modified:14 May 2012 14:00

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