화학공학소재연구정보센터
Thin Solid Films, Vol.379, No.1-2, 195-198, 2000
A low reflectivity multilayer cathode for organic light-emitting diodes
In this paper, a vacuum-deposited multilayer cathode for organic light-emitting diodes (OLEDs) with reduced reflectivity is described. The reduced reflectivity (58% at 550 nm) is due to the addition of a smooth and compact carbon film between a thin semi-transparent magnesium layer and the top aluminum contact. For the following light-emitting organic structure deposited on indium-tin-oxide substrates: N, N'-diphenyl-N, N'-bis-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD)/terbium tris(1-phenyl-3-methyl-4-(tertiarybutyryl)pyrazol-5-one) triphenylphosphine oxide [(tb-PMP)(3)Tb(Ph3PO)]/3-(4-biphenyl)-4-phenyl-5-(4-tert- butylphenyl)-1,2,4-triazole (TAZ), the injection properties of such a multilayer cathode are presented and compared to those of Al/Mg and C/Al cathodes. Such a cathode shows promise for contrast improvements in OLEDs.