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Nonlinear lattice relaxation of photoexcited diplatinum-halide chaincompounds is theoretically investigated within a one-dimensional extendedPeierls-Hubbard model. We first illuminate the whole relaxation scenario interms of variational wave functions and then visualize each relaxation channelnumerically integrating the Schr\"odinger equation. High-energy excitationsabove the electron-hole continuum tend to relax into polarons, while excitonspumped within the optical gap, unless luminescent, turn into solitonic statesnonradiatively. Neutral and charged solitons coexist as stable photoproducts,which has never been observed in conventional platinum-halide chains, and theyare highly resonant on the occasion of their birth and geminate recombination.

Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes