Improved performances in a top-emitting green organic light-emitting device with light magnification

A top-emitting organic light-emitting device (TOLED) with an architecture of Si/SiO2/Ag (100 nm)/Ag2O (UV ozone treatment for 30 s)/ 4',4-tris(3-methylphenylphenylamino)triphenylamine (45 nm)/4,4'-bis [N-(1-naphthyl-1-)-N-phenyl-amino]-biphenyl (5 nm)/tris-(8-hydroxyquinoline) aluminum (Alq(3)):10-(2-benzothiazolyl)-1, 1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-benzo[l]-pyrano[6,7,8-ij]quinolizin-11-one (C545T) (1: 0.5 weight %, 20 nm)/Alq(3) (30 nm)LiF(1 nm)/Al (0.5 nm)/Ag(30 nm) is designed with a resonance wavelength in the TOLED corresponding to the peak wavelength of C545T. With this enhanced cavity structure, light magnification with a coefficient of similar to 19 (forward direction) is observed, leading to significantly improved performances with brightness of 80215 cd/m(2) at 9 V, luminous efficiency of 32.7 cd/A at 6 V, external quantum efficiency of 8.9% at 7.5 V, and low turn-on voltage of 2.5 V. (c) 2007 Elsevier B.V. All rights reserved.