Exciton dissociation in organic light emitting diodes at the donor-acceptor interface |
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Authors: | Song Q L Li C M Chan-Park Mary B Lu M Yang H Hou X Y |
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Affiliation: | School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457. |
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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 oxideNPBhole-blocking layerAlq{3}aluminium to promote blue light emission from the NPB is more "exciton dissociation inhibition" than "hole blocking." |
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