A novel high-efficiency white hyperbranched polymer derived from polyfluorene with green and red iridium(III) complexes as the cores

作者：Sun, Jing; Wang, Hua; Xu, Huixia; Zhang, Tiaomei; Li, Lu; Li, Jie; Wu, Yuling; Xu, Bingshe^*; Zhang, Xinwen^*; Lai, Wenyong

来源：Dyes and Pigments, 2016, 130: 191-201.

DOI：10.1016/j.dyepig.2016.03.006

• Triple-color white-light emitting polymer
• Hyperbranched structure
• Green and red iridium(III) complexes
• Photophysical properties
• Film-forming
• Electroluminescent properties

A new kind of single triple-color hyperbranched polymer PF-Ir(PPY)(2)(pytzph)m-Ir(pici)(2) (PYtzph)n was designed and synthesized, in which green and red iridium(III) complexes acted as cores and blue polyfluorene acted as backbone. PF-Ir(PPY)(2)(pytzph)m-Ir(piq)2(pytzph)n (m = 5, n = 5 and m = 25, n = 5) had higher quantum efficiency than PF-Ir(piq)(2)(pytzph)-5. The energy transfer from green core bis(2-phenylpyridine)[3-(2-pyridYl)-5-Phenyl-1,2,4-triazole]iridium(III) Eir(PPY)(2)(PYtzPh)] with high triplet energy level (ET = 2.58 eV) to red core bis(1-phenylisoquinolinato)[3-(2-pyridyI)-5-phenyl-1,2,4-triazole] iridium(III) [Ir(piq)(2)(pytzph)] (ET = 2.12 eV) could realize by intermediate poly(9,9-dioctylfiuorene) (PF) segments. A typical single emitting-layer device with the configuration of ITO/PEDOT:PSS (40 nm)/PFIr(PPY)(2)(PYtzPh)m-ir(Piq)(2)(pytzph)n (80 nm)/TPBi (40 nm)/LiF (0.8 nm)/Al (100 nm) was fabricated. Among the white polymers, PF-Ir(PPY)(2)(pytzph)5-Ir(Piq)(2)(Pytzph)(5) exhibited excellent electrolumine-scent properties with a Commission Internationale Ed I'eclairage (CIE) coordinate of (0.32, 0.34) and a maximum luminous efficiency of 11.49 cd/A.

• 出版日期2016-7
• 单位南京邮电大学; 重庆文理学院; 太原理工大学