Please use this identifier to cite or link to this item:
|Title:||Electric field-induced transition from heterojunction to bulk charge recombination in bilayer polymer light-emitting diodes|
|Source:||Morteani, 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|
|Abstract:||We 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.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 8, 2018
WEB OF SCIENCETM
checked on Feb 7, 2018
checked on Mar 12, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.