We next investigated the photophysical behavior in the solid-state (Figure ). The emission spectra of 1 wt% doped TPI, DMAC-TPI and PXZ-TPI films in Zeonex are blue-shifted and narrower than those in solution. Zeonex is a nonpolar polymer host, thus the observed blue-shift and narrowing in DMAC-TPI and PXZ-TPI emission is expected based on its relative polarity compared to toluene. In the case of TPI this blue-shift can be attributed to suppression of non-radiative decay channels in the solid state as compared to the solution. PXZ-TPI shows a low intensity red-shoulder in its PL spectrum, likely the result of excimer emission (Figure ). Finally, room temperature phosphorescence (RTP) originating from PTZ was observed in PTZ-TPI. This RTP was accompanied by simultaneous emission from the S1 states of both TPI and PTZ (see Figure for band assignments). Occurrence of such multiple emission processes indicate that there is no electronic communication between TPI and PTZ in the excited state of PTZ-TPI.