Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1899751
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dc.titleElectric field-induced transition from heterojunction to bulk charge recombination in bilayer polymer light-emitting diodes
dc.contributor.authorMorteani, A.C.
dc.contributor.authorHo, P.K.H.
dc.contributor.authorFriend, R.H.
dc.contributor.authorSilva, C.
dc.date.accessioned2014-10-16T09:22:54Z
dc.date.available2014-10-16T09:22:54Z
dc.date.issued2005-04-18
dc.identifier.citationMorteani, A.C., Ho, P.K.H., Friend, R.H., Silva, C. (2005-04-18). Electric field-induced transition from heterojunction to bulk charge recombination in bilayer polymer light-emitting diodes. Applied Physics Letters 86 (16) : 1-3. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1899751
dc.identifier.issn00036951
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96393
dc.description.abstractWe investigate the photo- and electroluminescence from bilayers of electron- and hole-transporting polyfluorene derivatives at different device temperatures. We show that barrier-free charge capture at the heterojunction is the sole capture mechanism at low driving voltages (below 2.4× 105 V cm2 at room temperature). In this mechanism, which we suggested recently [Morteani, Adv. Mater. 15, 1708 (2003)], charge capture produces an interfacial excited state (exciplex) directly and bulk exciton electroluminescence is only achieved through endothermic transfer (activation energy 200 meV) from the exciplex. For high driving voltages (above 8.3× 105 V cm2 at 43 K), however, we find that charges are injected over the heterojunction barriers and subsequent charge recombination occurs in the polymer bulk. © 2005 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.1899751
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1063/1.1899751
dc.description.sourcetitleApplied Physics Letters
dc.description.volume86
dc.description.issue16
dc.description.page1-3
dc.description.codenAPPLA
dc.identifier.isiut000229040300070
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