Yu Mengna, Jia Xiong, Lin Dongqing, Du Xue, Jin Dong, Wei Ying, Xie Linghai, Huang Wei
Center for Molecular Systems and Organic Devices (CMSOD), State Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China.
Frontiers Science Center for Flexible Electronics (FSCFE), MIIT Key Laboratory of Flexible Electronics (KLoFE), Northwestern Polytechnical University (NPU), Xi'an, China.
Front Chem. 2021 Sep 3;9:717892. doi: 10.3389/fchem.2021.717892. eCollection 2021.
Bulky conjugated molecules with high stability are the prerequisite for the overall improvement of performance in wide-bandgap semiconductors. Herein, a chiral difluorenol, 2,2'-(9,9'-spirobi[fluorene]-2,2'-diyl)bis(9-(4-(octyloxy)phenyl)-9H-fluoren-9-ol) (DOHSBF), is set as a desirable model to reveal the stereoisomeric effects of wide-bandgap molecules toward controlling photophysical behavior and improving thermal and optical stability. Three diastereomers are obtained and elucidated by NMR spectra. Interestingly, the effect of modifying the stereo-centers is not observed on optical properties in solutions, pristine films, or post-treated film states. All three diastereomers as well as the mixture exhibit excellent spectral stability without undesirable green emission. Therefore, this stereoisomer-independent blue-emitting difluorenol will be a promising candidate for next-generation wide-bandgap semiconductors that would have extensive application in organic photonics.
具有高稳定性的大分子共轭分子是全面提高宽带隙半导体性能的先决条件。在此，一种手性二芴醇，即2,2'-(9,9'-螺二芴-2,2'-二基)双(9-(4-(辛氧基)苯基)-9H-芴-9-醇)(DOHSBF)，被设定为一个理想的模型，以揭示宽带隙分子的立体异构效应，从而控制光物理行为并提高热稳定性和光学稳定性。通过核磁共振光谱获得并阐明了三种非对映异构体。有趣的是，在溶液、原始薄膜或后处理薄膜状态下，改变立体中心对光学性质没有影响。所有三种非对映异构体以及混合物都表现出优异的光谱稳定性，没有不希望出现的绿色发射。因此，这种与立体异构体无关的蓝色发射二芴醇将是下一代宽带隙半导体的一个有前途的候选者，有望在有机光子学中得到广泛应用。
