In:
Applied Physics Letters, AIP Publishing, Vol. 88, No. 21 ( 2006-05-22)
Kurzfassung:
Efficient white organic light-emitting diodes based on copper complex, [Cu(bis[2-(diphenylphosphino)phenyl]ether)(6,7-dicyanodipyrido[2,2-d:2′,3′-f] quinoxaline)]BF4 [Cu(I) complex] , in which the white emission composed of yellow emission from Cu(I) complex doped 4,4′-N,N′-dicarbazole-biphenyl (CBP) layer and blue emission from N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-benzidine)-4,4′-diamine layer, were fabricated. A thin 2-(4-biphenylyl)-5-(4-tert-butyl-phenyl)-1,3,4-oxadiazole (Bu-PBD) layer sandwiched between the two emission layers acts as a chromaticity-tuning layer. The white device with 10nm, 2wt% Cu(I) complex doped CBP layer and 2nm Bu-PBD layer shows CIE coordinates of (0.33,0.36) at applied bias of 10V, a maximum luminance of 2466cd∕m2, and a maximum current efficiency of 6.76cd∕A, corresponding to the power efficiency of 3.85lm∕W. The efficient white emission is attributed to the simultaneous exciton formation in both emission layer. The working mechanism of the thin Bu-PBD layer for achieving white emission was also discussed.
Materialart:
Online-Ressource
ISSN:
0003-6951
,
1077-3118
Sprache:
Englisch
Verlag:
AIP Publishing
Publikationsdatum:
2006
ZDB Id:
211245-0
ZDB Id:
1469436-0
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