Role of Electron--Electron Interactions on Spin Effects in Electron--Hole Recombination in Organic Light Emitting Diodes
| dc.creator | Das, Mousumi | |
| dc.creator | Mazumdar, S. | |
| dc.creator | Ramasesha, S. | |
| dc.date | 2004-11-18 | |
| dc.date.accessioned | 2026-07-07T03:02:12Z | |
| dc.date.available | 2026-07-07T03:02:12Z | |
| dc.description | We extend our theory of electron--hole recombination in organic light emitting diodes to investigate the possibility that high energy singlet and triplet excited states with large electron--hole separations are generated in such processes, over and above the lowest singlet and triplet excitons. Our approach involves a time-dependent calculation of the interchain / intermolecular charge--transfer within model Hamiltonians that explicitly include electron-electron interactions between the $π$-electrons. We show that the electron--hole recombination reaction can be viewed as a tunneling process whose cross section depends on both the matrix element of the interchain part of Hamiltonian and the energy difference between the initial polaron--pair state and the final neutral states. There occurs a bifurcation of the electron--hole recombination path in each of the two spin channels that leads to the generation of both the lowest energy exciton and a specific high energy charge-transfer state, with the matrix elements favoring the lowest energy exciton and the energy difference factor favoring the higher energy state. The overall effect of the electron--electron interactions is to enhance the singlet:triplet yield ratio over the value of 0.25 predicted from statistical considerations that are valid only within noninteracting models. | |
| dc.description | 29 pages, 10 figures. To appear in 'Organic Light Emitting Diodes' Ed. J. Shinar, JohnWiley | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0411466 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0411466 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/25309 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Role of Electron--Electron Interactions on Spin Effects in Electron--Hole Recombination in Organic Light Emitting Diodes | |
| dc.type | text |