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Barrier‐Free Electron–Hole Capture in Polymer Blend Heterojunction Light‐Emitting Diodes
Author(s) -
Morteani A.C.,
Dhoot A.S.,
Kim J.S.,
Silva C.,
Greenham N.C.,
Murphy C.,
Moons E.,
Ciná S.,
Burroughes J.H.,
Friend R.H.
Publication year - 2003
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200305618
Subject(s) - materials science , heterojunction , optoelectronics , diode , light emitting diode , exciton , semiconductor , electron , excimer , oled , nanotechnology , optics , condensed matter physics , physics , layer (electronics) , quantum mechanics , fluorescence
A novel barrier‐free mechanism for electron–hole capture at heterojunctions between two semiconductor polymers is shown to occur in highly efficient light‐emitting diodes (LEDs). Electron–hole capture across the heterojunction forms an exciplex—a localized heterojunction state—and subsequent endothermic energy transfer produces highly emissive excitons. This process only requires low charge densities at the interface, enabling excellent LED performance.