Volume : IV, Issue : XII, December - 2015

Electroluminescence from blends of PQ

Miss. Pratima V. Damre, Dr. V. M. Raut

Abstract :

Electroluminescence efficiency and ightness of light–emitting diodes faicated from binary blends of conjugated polyquinolines was observed compared to devices made from the homopolymers. Blends of poly (2,2‘– (2,5– thienylene) – 6,6‘–bis(4–phenylquinoline)) (PTPQ) and poly (2,2 ‘(biphenylene) –6,6‘–bis (4–phenylquinoline)) (PBPQ), for example, had EL efficiency and luminance of up to a factor of 30 enhancement. Energy transfer was negligible in all four binary blend systems investigated. The electrical properties of the diodes and electric–field–modulated photoluminescence spectroscopy results confirmed that the enhancement of electroluminescence in the blends originated from spatial confinement of excitons which leads to increased exciton stability and electronhole recombination efficiency. Voltagetunable and composition–tunable multicolor electroluminescence was observed in the polymer blend devices. The observed composition–dependent new emission bands and enhanced fluorescence lifetimes in the blends were suggested to originate from exciplex formation and molecular miscibility between the blend components. These results demonstrate new phenomena in the electroluminescence and photophysics of multicomponent conjugated polymers.

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Miss.Pratima V. Damre, Dr.V. M. Raut Electroluminescence from Blends of PQ International Journal of Scientific Research, Vol : 4, Issue : 12 December 2015

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