Synthesis of New Conjugated Polyfluorene Derivatives Bearing Triphenylamine Moiety through a Vinylene Bridge and Their Stable Blue Electroluminescence
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- 作者：Rupei Tang ; Zhan'ao Tan ; Yongfang Li ; and Fu Xi
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：February 21, 2006
- 年：2006
- 卷：18
- 期：4
- 页码：1053 - 1061
- 全文大小：184K
- 年卷期：v.18,no.4(February 21, 2006)
- ISSN：1520-5002
文摘
Two new conjugated polyfluorene derivatives bearing triphenylamine moiety through a vinylene bridge,PDPF and PBPF, have been successfully synthesized according to the Suzuki coupling method. Thestructures and properties of the monomers and the resulting conjugated polymers were characterized byusing 1H NMR, 13C NMR, FT-IR, elemental analysis, GPC, TGA, DSC, UV-vis absorption spectroscopy,photoluminescence (PL) spectroscopy, and cyclic voltammetry (CV). The obtained polymers possessexcellent solubility in common organic solvents, good thermal stability with 5% weight loss temperatureof 415-448 
C, and relatively high glass transition temperature (Tg) at about 91-159 C. The weight-average molecular weight (Mw) of PDPF and PBPF were 5.79 × 104 and 1.68 × 104 with thepolydispersity index (PDI) of 2.75 and 2.69, respectively. The two-dimensional conjugated system ofPFs can effectively suppress 
-stacking/aggregation, improve hole injection, and facilitate intramolecularenergy transfer. Single-layer PLED devices using PDPF and PBPF with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al were fabricated. The maximum electroluminescence (EL) efficiency of the single-layer PLEDs based on PDPF and PBPF was about 0.19 and 0.51 cd/A, respectively. Meanwhile, thePLEDs with the optimized configuration of ITO/PEDOT:PSS/polymer/Alq3/Al showed greatly improvedperformance. The double-layer device based on PDPF emitted very stable greenish blue light with a lowturn-on voltage of 3.6 V and showed the maximum luminance of about 2930 cd/m2 at 21.0 V. Themaximum EL efficiency of the double-layer PLEDs based on PDPF and PBPF was both about 2.08cd/A.
C, and relatively high glass transition temperature (Tg) at about 91-159 C. The weight-average molecular weight (Mw) of PDPF and PBPF were 5.79 × 104 and 1.68 × 104 with thepolydispersity index (PDI) of 2.75 and 2.69, respectively. The two-dimensional conjugated system ofPFs can effectively suppress -stacking/aggregation, improve hole injection, and facilitate intramolecularenergy transfer. Single-layer PLED devices using PDPF and PBPF with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al were fabricated. The maximum electroluminescence (EL) efficiency of the single-layer PLEDs based on PDPF and PBPF was about 0.19 and 0.51 cd/A, respectively. Meanwhile, thePLEDs with the optimized configuration of ITO/PEDOT:PSS/polymer/Alq3/Al showed greatly improvedperformance. The double-layer device based on PDPF emitted very stable greenish blue light with a lowturn-on voltage of 3.6 V and showed the maximum luminance of about 2930 cd/m2 at 21.0 V. Themaximum EL efficiency of the double-layer PLEDs based on PDPF and PBPF was both about 2.08cd/A.