Energy luminescent conjugated polymers

H.-L. Wang, D.W. McBranch, V.I. Klimov, R. Helgeson, and F. Wudl, Controlled unidirectional energy transfer in luminescent self-assembled conjugated polymer superlattices, Chem. Phys. Lett., 315 173-180, 1999. 

Figure 11.13 The PL spectra from CN-PPP and CN-PPP doped with 5 wt.% of the indicated Eu complexes. All of the films had the same thickness and absorbed approximately the same amount of light, so the emission spectra can be compared to each other to determine relative quantum yields [50]. (Reproduced with permission from M.D. McGehee et al., Narrow bandwidth luminescence from blends with energy transfer from semiconducting conjugated polymers to europium complexes, Advanced Materials, 1999, 11, 1349-1354. Wiley-VCH Verlag GmbH Co. KGaA.)...

McGehee, M.D., Bergstedt, T., Zhang, C., et al. (1999) Narrow bandwidth luminescence from blends with energy transfer from semiconducting conjugated polymers to europium complexes. Advanced Materials, 11, 1349-1354. 

Following photoexcitation from the ground state (lAg in the notation of molecular spectroscopy) to the lowest energy state with proper symmetry (1B ), recombination to the ground state can be either radiative (with the emission of light, i.e. luminescence) or non-radiative. Some families of conjugated polymers... 

Figure 7.1 Schematic energy levels of singlet, triplet, trapped polaron, and bipolaron manifolds, and free carriers in luminescent n-conjugated polymers.

---