We next explored the photophysical behavior of these three compounds in the solid state, first using an inert host matrix, poly(methylmethacrylate), PMMA. The 1 wt% doped film of DMACPyBP, PXZPyBP, and DPACzPyBP in PMMA emit at λPL values of 618, 678, and 654 nm, respectively (Figure ), with the corresponding ΦPL values summarized in Table . The trends in λPL and ΦPL of the PMMA films closely mirror those observed in toluene. In an oxygen-free environment, the ΦPL values of these doped films in PMMA are 25, 4, and 7%, respectively, which decrease slightly to 22, 3, and 5% in the presence of oxygen. As shown in Figure , DMACPyBP, PXZPyBP, and DPACzPyBP each exhibit multiexponential decay kinetics with average prompt fluorescence lifetimes (τp,avg) of 24.9, 10.4, and 11.4 ns, and average delayed lifetime (τd,avg) of 18.9, 3.4, and 3.7 µs, respectively (Figure and Table ).