Highly efficient molecular organic light-emitting diodes based on exciplex emission

Palilis, L. C.; Mäkinen, A. J.; Uchida, M.; Kafafi, Z. H.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2209
Academic Journal
Highly efficient exciplex emission is observed from molecular organic light-emitting diodes (MOLEDs) based on silole derivatives as emissive and electron transport materials, and a hole transporting amine derivative. A silole derivative, 2,5-di-(3-biphenyl)-l,l-dimethyl3,4-diphenylsilacyclopentadiene (PPSPP), which shows blue fluorescence (476 nm) with a high solid-state photoluminescence quantum yield of 85% was used as the emitter. Another silole derivative, 2,5-bis- (2' ,2'-bipyridin- 6-yl)- 1,1 - dimethyl- 3,4- diphenylsilacyclopentadiene which exhibits high electron mobility, was used as the electron transport material. MOLEDs using these two siloles and N,N'-diphenyl-N,N'-(2-napthyl)-(1,1'-phenyl)-4,4'-diamine (NPB) as the hole transporter show electroluminescence (EL) emission centered at 495 nm. This red-shifted EL band relative to the blue fluorescence of PPSPP is assigned to a NPB:PPSPP exciplex. An operating voltage of 4.5 V was measured at 100 cd/m² and an EL quantum efficiency of 3.4% was achieved at 100 A/m².


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