A novel near-infrared-emitting cyclometalated platinum (II) complex with donor-acceptor-acceptor chromophores

作者：Yu, Junting; He, Keqi; Li, Yanhu; Tan, Hua; Zhu, Meixiang; Wang, Yafei; Liu, Yu; Zhu, Weiguo^*; Wu, Hongbin

来源：Dyes and Pigments, 2014, 107: 146-152.

DOI：10.1016/j.dyepig.2014.03.040

• Donor-acceptor-acceptor
• Platinum (II) complexes
• Near-infrared emission
• Electrophosphorescence
• Polymer light-emitting devices
• Synthesis

A novel near-infrared-emitting cyclometalated platinum (II) complex of (TPA-BT-Q)Ptpic with a donor-acceptor-acceptor (D-A-A) chromophores was synthesized and characterized, in which the TPA-BT-Q unit is a cyclometalated ligand of N,N-di(4-octyloxyphenyl)-4-(7-(quinolin-2-yl)-benzo[c][1,2,5]thiadiazol-4-yl)-phenylamine and pic is picolinate anion. Its optophysical, electrochemical and electroluminescent characteristics were primarily studied. An intense UV-vis absorption peak at 540 nm and a strong near-infrared emission peak at 759 nm were observed for (TPA-BT-Q)Ptpic in dichloromethane. Using (TPA-BT-Q)Ptpic as a single dopant and a blend of poly(vinylcarbazole) and 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole as a host matrix, the single-emissive-layer polymer light-emitting devices exhibited a near-infrared emission peaked at 760 nm with the maximum external quantum efficiency of 0.12% at 16.6 mA cm(-2) and a radiance intensity of 112 mu W cm(-2) at 11.7 mA cm(-2) at the doping concentrations of 2.0 wt%. This work provides an efficient approach to realize near-infrared electrophosphorescent emission with high radiance intensity by employing platinum (II) complex with the D-A-A structure.

• 出版日期2014-8
• 单位湘潭大学; 华南理工大学