کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5216159 | 1383254 | 2014 | 9 صفحه PDF | دانلود رایگان |
A series of green-emitting thiophenyl coumarin-cored carbazole dendrimers containing carbazole dendrons up to the third generation as substituent were synthesized and characterization. Their optical, thermal, electrochemical, and electroluminescent properties as non-doped solution-processed light-emitters for OLEDs were investigated. By incorporating carbazole dendrons in the molecule, we are able to reduce the crystallization and retain the high emissive ability of a planar thiophenyl coumarin fluorescent core in the solid state as well as improve the thermal stability of the material. These dendrimers showed a bright-green fluorescence and can form morphologically stable amorphous thin films with glass-transition temperatures as high as 285 °C. Simple structured solution-processed OLEDs using these materials as hole-transporting non-doped emitters and BCP as a buffer layer emit a stable green electroluminescence (λEL=502-526 nm) with high luminance efficiencies (up to 7.92 cd/A at 7.39 mA/cm2) and high green color purity (CIE=0.26, 0.62, which are close to the pure green color).
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Journal: Tetrahedron - Volume 70, Issue 36, 9 September 2014, Pages 6249-6257