Article Abstract:
Photoexcited electron transfer between donor and acceptor molecular semiconductors is an efficient method of charge generation after photabsorption. However problems exist in efficient charge separation and transport to collection electrodes as absorbed photons need to be close to the donor-acceptor heterojunction, but good connectivity of the donor and acceptor materials to respective electrodes is required at the same time. Combinations of acceptor and donor semiconducting polymers can go towards meeting this requirement, and two layer polymer diodes have been made with resulting structures providing good connectivity to collection electrodes.
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Article Abstract:
The intensity-dependent phenomena exhibited by conjugated-polymer microcavity under intense optical excitation characterize the behavior of polymers as good lasing mediums. Polymers are highly emissive solid state materials and have a clear threshold behavior. Lasing with conjugated polymers is seen in dilute solutions where organic dye solutions are used as tunable lasers. The electrical pumping in the polymers is more convenient than optical pumping and facilitates the design of lasers.
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Article Abstract:
Lasing in a high-Q poly(p-phenylenevinylene) (PPV) based microcavity devise shows that polymers have attained the quality which allows the development of electrically driven lasers in highly demanding applications of the devices. The optically driven laser activity of the microcavity devise is based on solids films of PPV. The occurrence of lasing in such a device supports a model where an emissive intrachain species is the key photoexcitation in PPV.
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