Abstract
A triphenylamine-functionalized ternary europium(III) complex of Eu(DBM)3(DTPA-Phen), in which DTPA-Phen is 3,8-bis[4-(diphenylamino)phenyl]-1,10-phenanthroline and DBM is dibenzoylmethanato, was designed, synthesized and characterized. This complex emits the characteristic red emission of trivalent europium ion due to the 5D0 → 7Fj (j = 0−4) transitions under photoexcitation and exhibits high thermal stability (432 °C). Using this complex as a guest and a blend of poly(9,9-dioctylfluorene) (PFO) along with 2-(tert-butylphenyl)-5-biphenylyl-1,3,4-oxadiazole (PBD) as a host matrix yielded the double-layer polymer light-emitting devices (PLEDs) with high performance. The narrow-bandwidth red emission that peaked at 612 nm with a full width at half-maximum of 10 nm was observed in these devices at the dopant concentrations from 1 to 8 wt %. The highest external quantum efficiency of 1.8% photons per electron at a current density of 1.2 mA/cm2, with a maximum brightness of 1333 cd/m2 at 173.2 mA/cm2, was achi...
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