Singlet exciton binding energy in poly(phenylene vinylene).

The role of long-lived dark states in the photoluminescence dynamics of phenylene vinylene conjugated polymers

The role of intermediate nonluminescent states in the relaxation of singlet excitons in the conjugated polymer poly~phenylene vinylene! ~PPV! and its soluble derivative poly@(2-methoxy-5-hexyloxy-p-phenylene) vinylene# ~MH-PPV! is investigated. Time-resolved luminescence and absorption measurements provide evidence for a long-lived, weakly emissive species in PPV at 17 K, in addition to the lum...

A Theoretical Investigation of the Low Lying Electronic Structure of Poly(p-phenylene Vinylene)

The two-state molecular orbital model of the one-dimensional phenyl-based semiconductors is applied to poly(para-phenylene vinylene). The energies of the low-lying excited states are calculated using the density matrix renormalization group method. Calculations of both the exciton size and the charge gap show that there are both 1B− u and 1 A + g excitonic levels below the band threshold. The e...

Comment on "triplet-to-singlet exciton formation in poly(p-phenylene-vinylene) light-emitting diodes".

The triplet to singlet exciton formation ratio in a MEH-PPV light-emitting diode is measured by comparing the triplet-induced absorptions with optical and electric excitations at the same singlet exciton density. The ratio is a strong universal decreasing function of the averaged electric field. Using 4 ns for singlet to triplet intersystem crossing time, the ratio is significantly larger than ...

University of Groningen Simultaneous enhancement of charge transport and exciton diffusion in poly(p- phenylene vinylene) derivatives

Excitons in poly(para phenylene vinylene): a quantum-chemical perspective based on high-level ab initio calculations.

Excitonic effects play a fundamental role in the photophysics of organic semiconductors such as poly(para phenylene vinylene) (PPV). The emergence of these effects is examined for PPV oligomers based on high level ab initio excited-state calculations. The computed many-body wavefunctions are subjected to our recently developed exciton analysis protocols to provide a qualitative and quantitative...