Yan Yan, Zhuang Cheng, Yangze Xu, Zihan Su, Yaxue Wang, Xin He, Zujin Zhao, Futong Liu, Ping Lu
{"title":"高效蓝色/深蓝色圆极化电致发光,效率衰减小","authors":"Yan Yan, Zhuang Cheng, Yangze Xu, Zihan Su, Yaxue Wang, Xin He, Zujin Zhao, Futong Liu, Ping Lu","doi":"10.1002/adfm.202408550","DOIUrl":null,"url":null,"abstract":"Developing efficient blue/deep-blue circularly polarized organic light-emitting diodes (CP-OLEDs) with small efficiency roll-off remains a great challenge for wide color gamut and high contrast 3D displays. Here, two pairs of chiral stable enantiomers, (<i>R</i>/<i>S</i>)-PPI-OBN-CN and (<i>R</i>/<i>S</i>)-PyI-OBN-CN, composed of imidazole derivatives phenanthroimidazole (PPI) and pyrenoimidazole (PyI) donors, and chiral group of (<i>R</i>/<i>S</i>)-octahydro-binaphthol (OBN-CN) acceptor are designed. These new blue/deep-blue molecular architectures exhibit excellent thermal and electrochemical stabilities, hybrid local and charge transfer (HLCT) excited state, and clear CPL characteristics with dissymmetry factors (|g<sub>PL</sub>|) of 1.57 × 10<sup>−3</sup>/2.49 × 10<sup>−3</sup> in the neat films. Moreover, the CP-OLEDs based on (<i>R</i>/<i>S</i>)-PPI-OBN-CN and (<i>R</i>/<i>S</i>)-PyI-OBN-CN exhibit the deep-blue/pure-blue emission with the CIE coordinates of (0.15, 0.08) and (0.15, 0.14), the maximum external quantum efficiencies (EQEs) of 7.25% and 8.11% and very small efficiency roll-offs of 17.6% and 1.8% at the luminescence of 1000 cd m<sup>−2</sup>, respectively. Even when the brightness is increased to 10000 cd m<sup>−2</sup>, (<i>R</i>/<i>S</i>)-PyI-OBN-CN-based device could still maintain as high as 6.68%. Obvious circularly polarized electroluminescence (CPEL) activities with the EL dissymmetry factors (<i>g</i><sub>EL</sub>) of +1.54 × 10<sup>−3</sup>/−1.63 × 10<sup>−3</sup> and +1.95 × 10<sup>−3</sup>/−1.72 × 10<sup>−3</sup> are also recorded. These are the first highly efficient blue/deep-blue CP-OLEDs based on “hot exciton” enantiomers.","PeriodicalId":112,"journal":{"name":"Advanced Functional Materials","volume":null,"pages":null},"PeriodicalIF":18.5000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Highly Efficient Blue/Deep-blue Circularly Polarized Electroluminescence with Small Efficiency Roll-Offs\",\"authors\":\"Yan Yan, Zhuang Cheng, Yangze Xu, Zihan Su, Yaxue Wang, Xin He, Zujin Zhao, Futong Liu, Ping Lu\",\"doi\":\"10.1002/adfm.202408550\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Developing efficient blue/deep-blue circularly polarized organic light-emitting diodes (CP-OLEDs) with small efficiency roll-off remains a great challenge for wide color gamut and high contrast 3D displays. Here, two pairs of chiral stable enantiomers, (<i>R</i>/<i>S</i>)-PPI-OBN-CN and (<i>R</i>/<i>S</i>)-PyI-OBN-CN, composed of imidazole derivatives phenanthroimidazole (PPI) and pyrenoimidazole (PyI) donors, and chiral group of (<i>R</i>/<i>S</i>)-octahydro-binaphthol (OBN-CN) acceptor are designed. These new blue/deep-blue molecular architectures exhibit excellent thermal and electrochemical stabilities, hybrid local and charge transfer (HLCT) excited state, and clear CPL characteristics with dissymmetry factors (|g<sub>PL</sub>|) of 1.57 × 10<sup>−3</sup>/2.49 × 10<sup>−3</sup> in the neat films. Moreover, the CP-OLEDs based on (<i>R</i>/<i>S</i>)-PPI-OBN-CN and (<i>R</i>/<i>S</i>)-PyI-OBN-CN exhibit the deep-blue/pure-blue emission with the CIE coordinates of (0.15, 0.08) and (0.15, 0.14), the maximum external quantum efficiencies (EQEs) of 7.25% and 8.11% and very small efficiency roll-offs of 17.6% and 1.8% at the luminescence of 1000 cd m<sup>−2</sup>, respectively. Even when the brightness is increased to 10000 cd m<sup>−2</sup>, (<i>R</i>/<i>S</i>)-PyI-OBN-CN-based device could still maintain as high as 6.68%. Obvious circularly polarized electroluminescence (CPEL) activities with the EL dissymmetry factors (<i>g</i><sub>EL</sub>) of +1.54 × 10<sup>−3</sup>/−1.63 × 10<sup>−3</sup> and +1.95 × 10<sup>−3</sup>/−1.72 × 10<sup>−3</sup> are also recorded. 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Highly Efficient Blue/Deep-blue Circularly Polarized Electroluminescence with Small Efficiency Roll-Offs
Developing efficient blue/deep-blue circularly polarized organic light-emitting diodes (CP-OLEDs) with small efficiency roll-off remains a great challenge for wide color gamut and high contrast 3D displays. Here, two pairs of chiral stable enantiomers, (R/S)-PPI-OBN-CN and (R/S)-PyI-OBN-CN, composed of imidazole derivatives phenanthroimidazole (PPI) and pyrenoimidazole (PyI) donors, and chiral group of (R/S)-octahydro-binaphthol (OBN-CN) acceptor are designed. These new blue/deep-blue molecular architectures exhibit excellent thermal and electrochemical stabilities, hybrid local and charge transfer (HLCT) excited state, and clear CPL characteristics with dissymmetry factors (|gPL|) of 1.57 × 10−3/2.49 × 10−3 in the neat films. Moreover, the CP-OLEDs based on (R/S)-PPI-OBN-CN and (R/S)-PyI-OBN-CN exhibit the deep-blue/pure-blue emission with the CIE coordinates of (0.15, 0.08) and (0.15, 0.14), the maximum external quantum efficiencies (EQEs) of 7.25% and 8.11% and very small efficiency roll-offs of 17.6% and 1.8% at the luminescence of 1000 cd m−2, respectively. Even when the brightness is increased to 10000 cd m−2, (R/S)-PyI-OBN-CN-based device could still maintain as high as 6.68%. Obvious circularly polarized electroluminescence (CPEL) activities with the EL dissymmetry factors (gEL) of +1.54 × 10−3/−1.63 × 10−3 and +1.95 × 10−3/−1.72 × 10−3 are also recorded. These are the first highly efficient blue/deep-blue CP-OLEDs based on “hot exciton” enantiomers.
期刊介绍:
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