Chinese Journal of Organic Chemistry >
Synthesis and Electroluminescence Properties of Donor-Acceptor (D-A) Type Near-Infrared Iridium(III) Complex Luminescent Materials with Bipolar Transmission Features
Received date: 2021-11-08
Revised date: 2022-01-27
Online published: 2022-02-10
Supported by
Innovation Team of Huxiang High-Level Talent Gathering Engineering(2021RC5028); Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, and the School of Materials and Engineering, Changzhou University(GDRGCS2020001)
In this paper, an auxiliary ligand with bipolar transmission characteristics, namely pic-PSCz, was synthesized by covalently connecting electron transport diphenylsulfone (PS) unit and hole transport carbazole (Cz) unit to picolinic acid (pic), and a bipolar transmission donor-acceptor (D-A) type near-infrared iridium (III) complex (tBuTPA-BTz-Iq)2Ir(pic-PSCz) (tBu is tert-butyl, TPA is triphenylamine, BTZ is benzotriazole and Iq is isoquinoline) was designed and synthesized. Compared with (Piq)2Ir(pic-PSCz), there is about 110 nm red shifted of (tBuTPA-BTz-Iq)2Ir(pic-PSCz) in emission spectra due to the strong D-A effect. Compared with the reported complex (TPA-BTz-Iq)2Irpic, the photophysical and electroluminescent properties of (tBuTPA-BTz-Iq)2Ir(pic-PSCz) were improved by introducing Cz and PS units. Its maximum emission peak is located in the near-infrared region of 716 nm, and a maximum external quantum efficiency (EQEmax) of 0.87% is achieved, which is three times as much as its parent complex (TPA-BTz-Iq)2Irpic (EQEmax is 0.29% @712 nm).
Liqin Cao , Xiaoqin Yang , Maoqiu Li , Lin Liu , Junting Yu , Hua Tan . Synthesis and Electroluminescence Properties of Donor-Acceptor (D-A) Type Near-Infrared Iridium(III) Complex Luminescent Materials with Bipolar Transmission Features[J]. Chinese Journal of Organic Chemistry, 2022 , 42(6) : 1831 -1838 . DOI: 10.6023/cjoc202111017
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