White organic light-emitting diode was realized by co-doping a blue dye
p-di(p-N,N-diphenyl-amino-styryl)benzene(DSA-ph) and a red dye
4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB) into a blue host
2-(t-butyl)-9,10-di(2-naphthyl)anthracene(TBADN), achieving a brightness of 11580 cd/m2 at 200 mA/cm2, and a
maximum current efficiency of 7.53 cd/A. The improvement was due to efficiency energy transfer from host to
guest by the aid of assistant energy transfer mechanism. The device introduced a
(4,4'-N,N'-dicarbazole)biphenyl/4,4'-bis(N-carbazolyl)biphenyl(CBP) interlayer between separate double emissive
layers with the same materials showed improved color stability, due to the blocking effect of the CBP layer, which
contributed to stable and even exciton distribution in both blue and red emission layer.
A top-emitting organic light-emitting device (TOLED) with an architecture of Ag/Wo3/4,4'-bis[N
-(1-naphthyl-1)-N-phenyl-amino]-biphenyl/tris-(8-hydroxyquinoline)aluminium(Alq3)/LiF/Al/semitransparent
Ag/Capping layer 20~40nm WO3 as capping layer has been investigated and WO3 was demonstrated to be an effective
capping layer and improve the luminance by a factor of 1.7 between the maximum and minimum transmittance of top
contact. In this paper, the thicknesses of organic layers are calculated based on Fabry-Perot cavity theory. And with
optimized, the top -emitting organic devices with single-mode resonance have a good ability such as a brightness of
40920cd/m2 at the current density of 600ma/cm2 and a maximum luminous efficiency of 7.32cd/A at 9145cd/m2.
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