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The Ce (x nm)/Au (15 nm) stacked layers were used as semitransparent cathodes in the top-emission organic light emitting devices (TOLEDs) fabricated on a p-type silicon anodes and substrate,where x varies from 4 to 16.The consequence of the Ce layer thickness on transmittance and the device performance were studied when the organic layers NPB (60 nm)/ALQ (60 nm) were kept unchanged,where NPB was N,N’-bis-(1-naphthl)-diphenyl-1,1’-biphenyl-4,4’-diamine,and AlQ is tris-(8-hydroxyquinoline) aluminum.The cathode of Ce (11 nm)/Au (15 nm) has a transparency of 46%,and the TOLED with it achieves the highest luminescence efficiencies:a current efficiency of 0.91 cd/A at 13.7 V and a peak power efficiency of 0.28 lm/W at 9 V.The turn-on voltage is 3.0 V.The Ce/Au cathode is both chemically and electrically stable.
The Ce (x nm) / Au (15 nm) stacked layers were used as semitransparent cathodes in the top-emission organic light emitting devices (TOLEDs) fabricated on a p-type silicon anodes and substrate, where x varies from 4 to 16. The consequence of the Ce layer thickness on transmittance and the device performance were studied when the organic layers NPB (60 nm) / ALQ (60 nm) were kept unchanged, where NPB was N, N’-bis- (1-naphthl) diphenyl-1,1’-biphenyl-4,4’-diamine, and AlQ is tris- (8-hydroxyquinoline) aluminum.The cathode of Ce (11 nm) / Au the TOLED with it achieves the highest luminescence efficiencies: a current efficiency of 0.91 cd / A at 13.7 V and a peak power efficiency of 0.28 lm / W at 9 V. The turn-on voltage is 3.0 V.The Ce / Au cathode is both chemically and electrically stable.