- Aggregation induced intermolecular charge transfer in simple nonconjugated donor–acceptor system
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The exploration of exciplex for organic light-emitting diodes (OLEDs) has been fleetly developed. However, many of them confront with the problems like phase separation and poor solubility, hampering their utilization in solution process. Hence, a series of soluble exciplex luminophores with the simple architecture of D-spacer-A (mCP-6C-TRZ, phCz-6C-TRZ and 2phCz-6C-TRZ) are synthesized and characterized, in which, the alkyl chain as ample spacer breaks the molecular backbone conjugation, induces intermolecular charge transfer process instead of intramolecular charge transfer in solid state. These materials are endowed with narrowed singlet?triplet splitting energy (ΔEST), efficient reverse intersystem crossing (RISC) process, and distinct thermally activated delayed fluorescence (TADF) characteristics. In view of their high triplet energy level (ET) and bipolar carrier transport ability, where efficient exciplexes are applied as the host, the solution-processed phosphorescence devices realize a low efficiency roll-off of 7.0% at 1000 cd m?2, high luminance, current efficiency (CE) and external quantum efficiency (EQE) of 25,990 cd m?2, 20.0 cd A?1 and 6.7%, respectively. These results offer a promising tactic to the establishment of exciplex with TADF feature as host for fabricating efficient solution processed OLEDs.
- Ban, Xinxin,Chen, Haowen,Jiang, Wei,Liu, Dan,Ma, Daiyu,Sun, Yueming,Tian, Wenwen,Wang, Bichen,Zhao, Guimin
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- NOVEL COMPOUND FOR ORGANIC LIGHT-EMITTING DIODE AND COATING COMPOSITION FOR ORGANIC LAYER COMPRISING THE SAME
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The present invention relates to a compound represented by general formula ((1) I), and a (1) coating solution composition comprising the same as. described in the detailed description of the present invention, as described in the detailed description of
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- Synthesis, Spectra, and Theoretical Investigations of 1,3,5-Triazines Compounds as Ultraviolet Rays Absorber Based on Time-Dependent Density Functional Calculations and three-Dimensional Quantitative Structure-Property Relationship
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A series of 1,3,5-triazines were synthesized and their UV absorption properties were tested. The computational chemistry methods were used to construct quantitative structure-property relationship (QSPR), which was used to computer aided design of new 1,3,5-triazines ultraviolet rays absorber compounds. The experimental UV absorption data are in good agreement with those predicted data using the Time-dependent density functional theory (TD-DFT) [B3LYP/6–311 + G(d,p)]. A suitable forecasting model (R > 0.8, P 0.0001) was revealed. Predictive three-dimensional quantitative structure-property relationship (3D-QSPR) model was established using multifit molecular alignment rule of Sybyl program, which conclusion is consistent with the TD-DFT calculation. The exceptional photostability mechanism of such ultraviolet rays absorber compounds was studied and confirmed as principally banked upon their ability to undergo excited-state deactivation via an ultrafast excited-state proton transfer (ESIPT). The intramolecular hydrogen bond (IMHB) of 1,3,5-triazines compounds is the basis for the excited state proton transfer, which was explored by IR spectroscopy, UV spectra, structural and energetic aspects of different conformers and frontier molecular orbitals analysis.
- Wang, Xueding,Xu, Yilian,Yang, Lu,Lu, Xiang,Zou, Hao,Yang, Weiqing,Zhang, Yuanyuan,Li, Zicheng,Ma, Menglin
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p. 707 - 723
(2018/05/05)
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