Figure 2
Triplet state measurements and the possible triplet energy transfer process.
(a) Phosphorescence spectra delayed by 1 ms in diluted toluene solutions of Si(dBu), Si(doTPA), Si(dtOXD), Si(tOXD)(oTPA) and Si(tOXD)(tTPA). The insets are the enlargements for each polymer in the range 390–450 nm. Note: main chain for Si(doTPA), the fraction of triplet excimer emission is trace (2.17%) as indicated by its near overlay with the baseline. Here, the fitting curves are the mainchain analogue (‒ ‒ ‒) and the excimer/exciplex emission (‒ · ‒). The numbers in percentage are the fraction of triplet emission contributed from the molecular complexes: excimer and exciplex obtained by deconvolution of the total triplet emission assuming the contribution from main chain and molecular complexes of the moieties on side arms. (b) Schematic diagram of the triplet energy transfer process of the bipolar polymer under photoexcitation at low temperature.
