Top-Emitting Organic Light-Emitting Diodes Using Cs/Al/Ag Cathodes

概要

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A semi-transparent cathode composed of Cs (0.5 nm)/Al (2.0 nm)/Ag (20 nm) at the wavelength of 515 nm exhibited the transmittance of 52% and the reflectance of 46%, respectively. The top-emitting device with the glass/Ag (100 nm)/tin-doped indium oxide (ITO, 125 nm)/4,4$'$,4$''$-tris[2-naphthylphenyl-1-phenylamino]triphenylamine (2-TNATA, 30 nm)/4,4$'$-bis[N-(1-napthyl)-N-phenyl-amino]-biphenyl (NPB, 15 nm)/tris(8-quinolinolato) aluminum(III) (Alq3, 55 nm)/Cs (0.5 nm)/Al (2 nm)/Ag (20 nm)/Alq3 (52 nm) structure showed the maximum luminance of 77,200 cd/m2. Also, the external quantum efficiency and the power efficiency at about 1,000 cd/m2 were 1.9% and 2.5 lm/W, respectively. It shows about 2 times higher luminous efficiency, compared to the same device structure having lithium fluoride instead of cesium.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-07-15