Exciton dissociation in organic light emitting diodes at the donor-acceptor interface.
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."
Song
Q L
QL
School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.
Li
C M
CM
Chan-Park
Mary B
MB
Lu
M
M
Yang
H
H
Hou
X Y
XY
D000535:Aluminum / Q000737:chemistry*; D001560:Benzidines / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000737:chemistry*; D049449:Luminescence; D009942:Organometallic Compounds / Q000737:chemistry*; D015125:Oxyquinoline / Q000737:chemistry*
D001560:Benzidines; D001713:Biphenyl Compounds; D009942:Organometallic Compounds; D015125:Oxyquinoline; D000535:Aluminum