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Fan Q.,Key Laboratory of Environment Friendly Chemistry and Application of the Ministry of Education | Liu Y.,Key Laboratory of Environment Friendly Chemistry and Application of the Ministry of Education | Hao Z.,Key Laboratory of Environment Friendly Chemistry and Application of the Ministry of Education | Li C.,South China University of Technology | And 4 more authors.
Science China Chemistry | Year: 2015

Polymer light-emitting diodes (PLEDs) containing Eu(DBM)3(BrDPPz) (DBM is dibenzoylmethane, and BrDPPz is 11-bromo-dipyrido[3,2-a:2′,3′-c]phenazine) doped in a blend of poly(9,9-dioctylfluorene) (PFO) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) as the host matrix are reported. Eu(DBM)3(BrDPPz) exhibited high thermal stability and intense UV-Vis absorption. Narrow-bandwidth red emission at 612 nm with a full width at half-maximum (FWHM) of 14.0 nm was observed from Eu(DBM)3(BrDPPz) in these double-layered PLEDs at dopant concentrations from 1 wt% to 8 wt%. For the PLED containing 1 wt% Eu(DBM)3(BrDPPz), a maximum luminance of 829 cd/m2 at 153.5 mA/cm2, highest external quantum efficiency of 1.70% at 2.1 mA/cm2 and maximum luminance of 0.74 cd/A at 4.31 mA/cm2 were obtained. © 2015 Science China Press and Springer-Verlag Berlin Heidelberg Source

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