Organic Electroluminescence of Styryl Type Dyes on Vacuum Deposited Thin Films

Some styryl type dyes, such as 2-(4-Dimethylaminostyryl)benzoxazole (1), were found to be useful as novel emitting materials for the electroluminescent (EL) device. The EL devices with hole transporting layer have more efficiency than that with only emitting layer, but the electron trans porting layer do not work effectively. The EL intensity of the H-type device with 1 was 3.8 cd/m2 at the dc bias voltage of 60 volt.