Author/Authors :
Jin، نويسنده , , Y.D. and Yang، نويسنده , , J.P. and Heremans، نويسنده , , P.L. and Van der Auweraer، نويسنده , , Shona M. and Rousseau، نويسنده , , E. and Geise، نويسنده , , H.J. and Borghs، نويسنده , , G.، نويسنده ,
Abstract :
We present a highly efficient organic light-emitting diode with a single-layer structure and air-stable Al cathode. The device consists of a spin-coated thin film of polystyrene in which rubrene and Alq3 molecules are dispersed. By optimizing the concentration of Alq3 and rubrene, a maximum external quantum efficiency of 2.0% photons/electron and a current efficiency of 8.5 cd/A at 22 V could be achieved in the device. The high electroluminescence efficiency is attributed to a combination of energy transfer from Alq3 to rubrene, and direct carrier trapping and recombination on rubrene, followed by an efficient fluorescent emission from rubrene.
