Rational molecular design of phenanthroimidazole-based fluorescent materials towards high-efficiency non-doped deep blue OLEDs

doi:10.1039/d2tc02329f

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	Rational molecular design of phenanthroimidazole-based fluorescent materials towards high-efficiency non-doped deep blue OLEDs
	C. Y. Du; T. Lu; Z. Cheng; Y. L. Chang; H. Liu; J. Wang; L. Wan; Y. Lv and P. Lu
	2022
发表期刊	Journal of Materials Chemistry C
ISSN	2050-7526
卷号	10 期号:38 页码:14186-14193
摘要	Achieving high external quantum efficiency (EQE) for non-doped deep blue fluorescent organic light-emitting diodes (OLEDs) with the Commission International de I'Eclairage (CIE) coordinate of CIEy < 0.08 remains a big challenge. Herein, three high-efficiency molecules PPI-2-DMF, PPI-2-DPF and PPI3-SBF with weak intramolecular charge transfer properties are successfully prepared by connecting phenanthroimidazole (PI) and various fluorene derivatives via benzene bridges. The crystallographic study confirms that only C-H center dot center dot center dot pi weak intermolecular interactions exist in these crystals, which is conducive to obtaining high solid-state fluorescence efficiency, and eventually, the photoluminescence quantum yields (PLQYs) of PPI-2-DMF, PPI-2-DPF and PPI-3-SBF reach 57.56, 67.22 and 66.05%, respectively. PPI-3-SBF exhibits the shortest conjugation length among the three molecules, leading to the bluest emission. As a result, the non-doped device with PPI-3-SBF as an emitting layer realizes a high maximum EQE of 8.41% with CIE coordinates of (0.16, 0.07), accompanied by a relatively low efficiency roll-off. These findings would provide a new strategy of molecular structure design for highly efficient deep blue non-doped OLEDs.
DOI	10.1039/d2tc02329f
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收录类别	sci ; ei
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67019
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	C. Y. Du,T. Lu,Z. Cheng,et al. Rational molecular design of phenanthroimidazole-based fluorescent materials towards high-efficiency non-doped deep blue OLEDs[J]. Journal of Materials Chemistry C,2022,10(38):14186-14193.
APA	C. Y. Du.,T. Lu.,Z. Cheng.,Y. L. Chang.,H. Liu.,...&Y. Lv and P. Lu.(2022).Rational molecular design of phenanthroimidazole-based fluorescent materials towards high-efficiency non-doped deep blue OLEDs.Journal of Materials Chemistry C,10(38),14186-14193.
MLA	C. Y. Du,et al."Rational molecular design of phenanthroimidazole-based fluorescent materials towards high-efficiency non-doped deep blue OLEDs".Journal of Materials Chemistry C 10.38(2022):14186-14193.

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