Transparent white organic light-emitting devices with a LiF/Yb:Ag cathode.
Transparent white organic light-emitting devices with a LiF/Yb:Ag cathode are reported. The device with a structure of indium-tin oxide/ 4,4('),4('') -tris(3-methylphenyl-phenylamino)-tripheny-lamine (40 nm)/N,N(')-bis-(1-naphthyl)- N,N(') -diphenyl- 1,1(')-biph-enyl-4,4(')-diamine (NPB: 7 nm)/rubrene (0.1 nm)/NPB(3 nm)/2,2('),2('')-(1,3,5-phenylene) tris(1-phenyl- 1H- benzimidazole (30 nm)/tris (8-hydroxyquinoline) aluminum (20 nm)/LiF(0.5 nm)/Yb:Ag (15 nm, volume ratio 1:1) shows few differences in luminance and color purity from both sides. For instant, at a driving voltage of 10 V, the luminance and CIE coordinates of 1173/1488 cd/m(2) and (0.3482,0.3596)/(0.3508,0.3352) are obtained from top/bottom sides. CIE coordinates of the device from both sides are voltage independent, and the maximum total electroluminescence efficiencies of the device are 4.6 cd/A.
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
Tianyu
T
Zhang
Letian
L
Zhang
Wenyu
W
Ji
Wenfa
W
Xie