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Reduced Operating Voltages in Polymer Light‐Emitting Diodes Doped with Rare‐Earth Complexes
Author(s) -
Robinson M.R.,
Ostrowski J.C.,
Bazan G.C.,
McGehee M.D.
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.200304651
Subject(s) - materials science , light emitting diode , europium , diode , doping , optoelectronics , rare earth , polymer , electroluminescence , voltage , phenylene , luminescence , nanotechnology , composite material , electrical engineering , engineering , layer (electronics) , metallurgy
Light‐emitting diodes (LEDs) were fabricated using two europium complexes , differing only by the addition of tert ‐butyl groups around the β‐diketonate ligands (see Figure), blended into poly(2‐(6′‐cyano‐6′‐methyl‐heptyloxy)‐1,4‐phenylene) (CN‐PPP). The addition of tert ‐butyl groups results in CN‐PPP–Eu LEDs with increased operational lifetime and decreased operating voltage.