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Electroluminescent orthofused thiophene dye embedded in polyvinylcarbazole

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5 Author(s)
Giovanella, Umberto ; Istituto per lo Studio delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy ; Botta, Chiara ; Bossi, Alberto ; Licandro, Emanuela
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The photoluminescence and electroluminescence of a molecular precursor of helicene embedded in an active matrix formed by a hole-transporter polymer mixed with an electron transporter molecule are reported. Optimization of the weight ratio between the dye and the matrix is performed by a detailed study of the absolute emission efficiencies obtained by photoexcitation and by charge injection. A 0.17 wt % dye concentration gives the best compromise among energy transfer, transport properties, and quenching effects induced by dye aggregation, leading to an external blue electroluminescence efficiency of 0.4% in a single layer device.

Published in:

Journal of Applied Physics  (Volume:100 ,  Issue: 8 )

Date of Publication:

Oct 2006

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