Next, we investigated the PL properties of these compounds in 10 wt% doped films in PMMA. Compounds T-tBuCz-AQ, T-MeOCz-AQ, C-tBuCz-AQ, and C-MeOCz-AQ showed structureless emission at lPL of 650, 700, 655 and 700, illustrating again that the emission of the cis-isomers is red-shifted compared to that of the trans-counterparts; aligning with previous measurements in solution and powder, the emission of DMAC-PA at 700 nm is red-shifted compared to that of tBuCz-PA at 600 nm (Figure ). The corresponding ΦPL values of the emitters are low (Table ), in part due to the energy gap law, at 6.6/ 3.9, 2.7/ 2.4, 3.6/ 3.6, 3.0/ 2.6, 2.8/ 2.8, and 2.6/ 2.6 in N2/ air.