Highly efficient sharp red electroluminescence from europium complex-doped poly(9,9-dioctylfluorene) devices

• DOI: 10.1016/j.cplett.2006.11.070
• Publication Date: 2006-11-27T14:24:41Z
• Authors: Yu Liu; Jingdian Li; Chun Li; Jungeng Song; Youlong Zhang; Junbiao Peng; Xiayu Wang; Meixiang Zhu; Yong Cao; Weiguo Zhu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract Using a europium complex containing bromine groups as a guest dopant and a blend of poly(9,9-dioctylfluorene) and 2- tert -butylphenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix, the polymer light-emitting devices exhibited bright red electroluminescent emissions at 612 nm with a full width at half maximum of 19 nm. The different spectral characteristics of photoluminescence and electroluminescence were analyzed. Highly efficient emission was observed in the devices with a maximum external quantum efficiency of 1.4% at 1.5 mA/cm 2 and a peak luminance of 278 cd/m 2 at 50.0 mA/cm 2 .