The doping of a widely used active polymeric matrix, the polyvinyl carbazole (PVK), with an organic blue emitter has been studied by both continuous wave and time resolved photoluminescence spectroscopy. It is found that the overall emission efficiency of the blend is controlled by two processes: the resonant transfer from the donor to the acceptor and the hopping between the donor sites. Because of the observed spectral variations of the emission spectrum of PVK (donor) with the temperature, both processes exhibit a strong, albeit opposite temperature dependence. The existence of the hopping process accounts for the sharp increase of the transfer efficiency with the concentration, not predicted by the Foerster theory. © 2002 American Institute of Physics.
Giovanella, U., Botta, C., Gurioli, M., Papagni, A., Tubino, R., Maiorana, S., et al. (2002). Optical properties and photoexcitations of an embedded in a polymeric active matrix. JOURNAL OF APPLIED PHYSICS, 91(10), 6511-6515 [10.1063/1.1473211].
Optical properties and photoexcitations of an embedded in a polymeric active matrix
PAPAGNI, ANTONIO;TUBINO, RICCARDO;
2002
Abstract
The doping of a widely used active polymeric matrix, the polyvinyl carbazole (PVK), with an organic blue emitter has been studied by both continuous wave and time resolved photoluminescence spectroscopy. It is found that the overall emission efficiency of the blend is controlled by two processes: the resonant transfer from the donor to the acceptor and the hopping between the donor sites. Because of the observed spectral variations of the emission spectrum of PVK (donor) with the temperature, both processes exhibit a strong, albeit opposite temperature dependence. The existence of the hopping process accounts for the sharp increase of the transfer efficiency with the concentration, not predicted by the Foerster theory. © 2002 American Institute of Physics.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
