Polyfluorene presenting dipolar pendent groups and its application to electroluminescent devices
| العنوان: | Polyfluorene presenting dipolar pendent groups and its application to electroluminescent devices |
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| المؤلفون: | Ching-Fong Shu, Ping-I Shih, Fang-Iy Wu, Yun Chi, Chen-Han Chien |
| المصدر: | Journal of Polymer Science Part A: Polymer Chemistry. 45:2073-2084 |
| بيانات النشر: | Wiley, 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Materials science, Polymers and Plastics, Organic Chemistry, Quantum yield, Fluorene, Electroluminescence, Photochemistry, Triphenylamine, chemistry.chemical_compound, Polyfluorene, chemistry, Materials Chemistry, OLED, Quantum efficiency, HOMO/LUMO |
| الوصف: | We have synthesized a blue-light-emitting polyfluorene derivative (PF-TPAOXD) that presents sterically hindered, dipolar pendent groups functionalized at the C-9 positions of alternating fluorene units. The incorporation of the dipolar side chains, each comprising an electron-rich triphenylamine group and an electron-deficient oxadiazole group connected through a π-conjugated bridge, endows the resultant polymer with higher highest occupied molecular orbital and lower lowest unoccupied molecular orbital energy levels, which, consequently, lead to an increase in both hole and electron affinities. An electroluminescent device incorporating this polymer as the emitting layer exhibited a stable blue emission with a maximum brightness of 2080 cd/ m 2 at 12 V and a maximum external quantum efficiency of 1.4% at a brightness of 137 cd/m 2 . Furthermore, atomic force microscopy measurements indicated that the dipolar nature of PF-TPAOXD, in contrast to the general nonpolarity of polydialkylfluorenes, provided a stabilizing environment allowing the polar organometallic triplet dopant to be dispersed homogeneously. We also fabricated an electrophosphorescent device incorporating PF-TPAOXD as the host material doped with a red-emitting osmium complex to realize red electroluminescence with Commission Internationale de l'Eclairage color coordinates of (0.66, 0.34). The resulting device exhibited a maximum external quantum efficiency of 7.3% at a brightness of 1747 cd/m 2 and a maximum brightness of 7244 cd/ m 2 . |
| تدمد: | 1099-0518 0887-624X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::f5e4deb800256d59441654dfcc1a7587 https://doi.org/10.1002/pola.21971 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........f5e4deb800256d59441654dfcc1a7587 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10990518 0887624X |
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