High-efficiency small molecule light-emitting diodes by spin-coating for orange, blue and white emission
Faculty of Sciences. Chemistry
Proceeding of the tenth international workshop on the physics of semiconductor devices, vols I and II
10th International Workshop on the Physics of Semiconductor Devices, (IWPSD 99), DEC 14-18, 1999, New Delhi, India
, p. 1141-1146
University of Antwerp
We present efficient organic light emitting diodes (OLEDs) which have a single organic layer, applied by spin-coating, and air-stable Al cathodes. The organic layer consists of a spin-coated thin film of polystyrene in which various active materials were dispersed. For orange emission, Alq(3) and rubrene are used as active material; for blue, a phenylene-vinylene trimer (1,4-bis(l,l-dipheny1-2-ethenyl)benzene) is used. Also white light emission has been achieved by combining the molecules for orange and blue emission. We discuss the fabrication process, the characteristics, and the dependence of the OLED properties on the concentrations of the various active materials.