Novel orange-red light-emitting polymers with cyclometaled iridium complex grafted in alkyl chain |
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| Authors: | Lei Ying Yong Cao |
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| Institution: | Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials, Ministry of Education, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Novel poly(fluorene-alt-carbazole) (PFCz) based copolymers with 3,6-carbazole-N-alkyl grafted iridium complex using 2,3-diphenylpyrazine as ligand (IrBpz) were synthesized by Suzuki polycondensation. The emission of host polymer, PFCz, was completely quenched when the copolymer with 1 mol% of iridium complex. An orange-red emission with CIE coordinate of (0.56, 0.42) was observed from Phosphorescent polymer light-emitting diodes (PhPLEDs). The PhPLEDs made by this copolymer-iridium complex showed a maximum luminous efficiency (LE) of 5.58 cd/A and a maximal luminance of 8625 cd/m2. White light with CIE coordinate of (0.33, 0.27) was observed from white PhPLEDs (WPhPLEDs) made by the copolymer containing 0.4 mol% iridium complex. A LE of 2.30 cd/A with luminance of 2068 cd/m2 was observed from WPhPLEDs. |
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| Keywords: | Fluorene-alt-carbazole copolymer Ir complex Light-emitting diode (LED) |
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