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Liu B, Dang F, Tian Z, Feng Z, Jin D, Dang W, Yang X, Zhou G, Wu Z. High Triplet Energy Level Achieved by Tuning the Arrangement of Building Blocks in Phosphorescent Polymer Backbones for Furnishing High Electroluminescent Performances in Both Blue and White Organic Light-Emitting Devices. ACS APPLIED MATERIALS & INTERFACES 2017; 9:16360-16374. [PMID: 28441863 DOI: 10.1021/acsami.7b04509] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A high triplet energy level (ET) of ca. 2.83 eV has been achieved in a novel polymer backbone through tuning the arrangement of two kinds of building blocks, showing enhanced hole injection/transporting capacity. Based on this new polymer backbone with high ET, both blue and white phosphorescent polymers were successfully developed with a trade-off between high ET and enhanced charge-carrier transporting ability. In addition, their photophysical features, electrochemical behaviors, and electroluminescent (EL) properties have been characterized in detail. Benefitting from the advantages associated with the novel polymer backbone, the blue phosphorescent polymers show top-ranking EL performances with a maximum luminance efficiency (ηL) of 15.22 cd A-1, corresponding to a power efficiency (ηP) of 12.64 lm W-1, and external quantum efficiency (ηext) of 6.22% and the stable Commission Internationale de L'Eclairage (CIE) coordinates of (0.19, 0.38). Furthermore, blue-orange (B-O) complementary-colored white phosphorescent polymers based on this novel polymer backbone were also obtained showing encouraging EL efficiencies of 12.34 cd A-1, 9.59 lm W-1, and 4.10% in the optimized WOLED together with exceptionally stable CIE coordinates of (Δx = 0.014, Δy = 0.010) in a wide driving voltage range from 4 to 16 V. All of these attractive EL results achieved by these novel phosphorescent polymers show the great potential of this new polymer backbone in developing highly efficient phosphorescent polymers.
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Affiliation(s)
- Boao Liu
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Feifan Dang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Zhuanzhuan Tian
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Zhao Feng
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Deyuan Jin
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Wanping Dang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Xiaolong Yang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Guijiang Zhou
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
| | - Zhaoxin Wu
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China
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