title: Exciton dissociation in organic light emitting diodes at the donor-acceptor interface.
abstract: Experimental in situ photoluminescence and transient photovoltage results show that the interface formed by N, N{'}-Bis(naphthalene-1-yl)-N, N{'}-bis(phenyl) benzidine (NPB) and tris(8-hydroxyquinoline) aluminum (Alq{3}) acts as an exciton dissociation site. Because of this dissociation effect, excitons formed in NPB at or within a diffusion length of the interface tend to dissociate before they radiatively decay to generate blue light. This suggests that the action of the "hole-blocking layer" used in indium tin oxide\NPB\hole-blocking layer\Alq{3}\aluminium to promote blue light emission from the NPB is more "exciton dissociation inhibition" than "hole blocking."
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.
authors.forename: Q L
authors.initials: QL
authors.lastname: Song
authors.forename: C M
authors.initials: CM
authors.lastname: Li
authors.forename: Mary B
authors.initials: MB
authors.lastname: Chan-Park
authors.forename: M
authors.initials: M
authors.lastname: Lu
authors.forename: H
authors.initials: H
authors.lastname: Yang
authors.forename: X Y
authors.initials: XY
authors.lastname: Hou
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D001560:Benzidines / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000737:chemistry*; D049449:Luminescence; D009942:Organometallic Compounds / Q000737:chemistry*; D015125:Oxyquinoline / Q000737:chemistry*
chemical_list: D001560:Benzidines; D001713:Biphenyl Compounds; D009942:Organometallic Compounds; D015125:Oxyquinoline; D000535:Aluminum