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The Built‐In Potential in Blue Polyfluorene‐Based Light‐Emitting Diodes
Author(s) -
Bodrozic Vladimir,
Brown Thomas M.,
Mian Shabbir,
Caruana Daren,
Roberts Matthew,
Phillips Nathan,
Halls Jonathan J.,
Grizzi Ilaria,
Burroughes Jeremy H.,
Cacialli Franco
Publication year - 2008
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.200702346
Subject(s) - polyfluorene , materials science , optoelectronics , electroluminescence , diode , work function , oled , cyclic voltammetry , spectroscopy , active layer , polymer , light emitting diode , layer (electronics) , nanotechnology , electrode , composite material , physics , quantum mechanics , electrochemistry , thin film transistor
Energy level alignment in polyfluorene‐based polymer light‐emitting diodes (PLEDs) is studied with electroabsorption spectroscopy and cyclic voltammetry (CV). Using an active layer containing a blend of three polyfluorenes, it is found that the built‐in potential values are determined by the interplay of the contacts' work function and the lowest and highest lying energy levels of the blend components.