Author/Authors :
Garten، نويسنده , , F. and Hilberer، نويسنده , , A. and Cacialli، نويسنده , , F. and Esselink، نويسنده , , F.J. and van Dam، نويسنده , , Y. and Schlatmann، نويسنده , , A.R. and Friend، نويسنده , , R.H. and Klapwijk، نويسنده , , T.M. and Hadziioannou، نويسنده , , G.، نويسنده ,
Abstract :
Efficient blue Light Emitting Diodes (LEDs) based on a novel partially conjugated co-polymer (SiPPV) have been realized by a combination of techniques known to enhance the quantum efficiency of organic devices. The copolymer is homogeneously blended in a PVK-matrix to reduce the number of non-radiative decay paths. In single-layer devices the high barrier at the Al top electrode limits efficient electron-injection into the device. In double-layer structures with an evaporated PBD-film at the cathodic side, electron and hole currents are much more balanced, resulting in an internal quantum efficiency of 3.2 %. The average turn-on field of a double-layer device is reduced compared to a single-layer LED
Keywords :
LED , Polymer , PPV , Multilayer , electroluminescence
