title: Efficient solution-processed double-layer red OLEDs based on a new europium complex with a carbazole group.
abstract: A new europium complex EuL3 (Phen) was used as guest dopant, and a blend of Polyvinylcarbazole and 2-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PVK and PBD) as host matrix. Efficient red organic light-emitting devices (OLEDs) with double-layer structures were manufactured via a solution-processed technique. The guest-doped levels were 1, 3 and 5 wt% relative to the blend mass, respectively. For the 1 wt% doping-level device, the luminous efficiency and luminance were up to 2.96 cd/A and 635.78 cd/m(2) with emissions from both EuL3 (Phen) and from the host; for the 3 wt% doping-level device, the maximum luminous efficiency and luminance were 1.01 cd/A and 370.91 cd/m(2) for the single emission from EuL3 (Phen) only.
authors.affiliation: School of New Energy Science and Engineering, Xinyu University, Xinyu, 338004, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.forename: Jing-Sheng
authors.initials: JS
authors.lastname: Miao
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Wu
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry; D002227:Carbazoles / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D008029:Lighting / Q000295:instrumentation*; D049449:Luminescence; D010069:Oxadiazoles / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D012996:Solutions / Q000737:chemistry
chemical_list: C549860:2-(4'-biphenyl)-5-(4''-tert-butylphenyl)-1,3,4-oxadiazole; D001713:Biphenyl Compounds; D002227:Carbazoles; D010069:Oxadiazoles; D011145:Polyvinyls; D012996:Solutions; C041514:carbazole; C035125:poly-N-vinylcarbazole; D005063:Europium
keywords: Electroluminescence; Europium complex; Solution-processed OLEDs