Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China
; Chinese Acad Sci, Photoemiss Spect Stn, Dept Synchrotron Radiat, Inst High Energy Phys, Beijing 100039, Peoples R China
; Kyoto Univ, Inst Chem Res, Uji 611, Japan
We investigate the electroluminescence spectra of a series of double- and triple-layered devices based on a rare-earth complex PTT,tris-(1-phenyl-3-methyl-4-isobutyryl-5-pyrozolone)-bis(triphenyl phosphine oxide) terbium. In triple-layer devices, besides green electroluminescence from the light-emitting layer PTT, blue emission from the hole transport layer TPD (N,N'-bis (3-methylphenyl)-N,N'-diphenyl-benzidine) occurs at high electric field strength (EFS) and its peak intensity increases with EFS, This indicates a charge carrier tunneling injection mechanism. At high EFS, the Fowler-Nordheim (FN) plot is close to Linear, supporting the tunneling mechanism. The large barriers at the cathode and anode interfaces are responsible for this FN behavior. In double-layer devices where the 8-hydroxyquinoline-aluminum layer is absent, TPD emission dominates the electroluminescence, proving that PTT possesses high electron mobility. (C) 1998 Elsevier Science B.V. All rights reserved.
; Physics, Atomic, Molecular & Chemical
Gao, XC,Cao, H,Huang, CH,et al. Electroluminescence from both a light-emitting layer and hole transport layer: spectral evidence for charge carrier tunneling injection[J]. CHEMICAL PHYSICS LETTERS,1998,297(5-6):530-536.
Gao, XC.,Cao, H.,Huang, CH.,Li, BG.,Ibrahim, K.,...&刘凤琴.(1998).Electroluminescence from both a light-emitting layer and hole transport layer: spectral evidence for charge carrier tunneling injection.CHEMICAL PHYSICS LETTERS,297(5-6),530-536.
Gao, XC,et al."Electroluminescence from both a light-emitting layer and hole transport layer: spectral evidence for charge carrier tunneling injection".CHEMICAL PHYSICS LETTERS 297.5-6(1998):530-536.