American Institute of Physics, Journal of Applied Physics, 8(100), p. 083107
DOI: 10.1063/1.2358304
Full text: Unavailable
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 0.17wt% 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.