Heteroannihilation of the excited states of associates and monomers of fluorescein dyes on the silica surface at low temperatures

The processes of homo-and hetero-triplet—triplet annihilation (TTA) of Bengali rose on the spongy silicon surface have been investigated. It has been found that upon pulse photoexcitation on the silica surface photophysical processes involving the triplet states of monomers and their associates can develop. It has been shown that the processes of hetero-TTA are inhibited due to the decomposition of associates under the influence of hexane molecules in the molecular clusters of the dye adsorbates. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 734–737, November–December, 2005.