ROOM-TEMPERATURE ULTRAVIOLET ELECTROLUMINESCENCE FROM EVAPORATED POLY(DIMETHYLSILANE) FILM

Ultraviolet electroluminescent diodes operating at room temperature ha ve been prepared using evaporated poly(dimethylsilane). (PDMS) as an e mission layer. The emission spectrum is composed of ultraviolet and vi sible components. The ultraviolet component peakes at 350 nm due to th e sigma-sigma transition in the Si main chain while the visible regio n is broad and may be related to defects in the PDMS him. Little degra dation is observed in the emission characteristics. The external quant um efficiency is estimated to be as low as 1.6 x 10(-4) because of the absorption loss of the glass substrate and for other reasons.