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Simple sulfone-bridged heterohelicene structure realizes ultraviolet narrowband thermally activated delayed fluorescence,circularly polarized luminescence,and room temperature phosphorescence

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Science China Chemistry 2022年第9期65卷 1715-1719页

作者： Weimin Ning Han Wang Shaolong Gong Cheng Zhong Chuluo Yang Department of Chemistry Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan 430072China Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China

Due to narrowband emission and high quantum efficiencies,polycyclic aromatic heterocycles with multi-resonance thermally activated delayed fluorescence(MR-TADF)properties have recently gained considerable attention in the organic optoelectronic *** their great promise in the full visible region covering from blue to red,MR-TADF emitters with ultraviolet emission have been rarely *** locking the two ortho-positions of a triphenylamine core by sulfone groups,a simple polycyclic aromatic heterocycle,BTPT,was facilely constructed,exhibiting 368 nm ultraviolet emission with a narrow full width at half maximum(FWHM)of 33 *** neat film exhibited distinct TADF property with a main emission peak at 388 ***,the enantiomeric crystals of BTPT not only demonstrated significant circularly polarized luminescence(CPL)with large luminescence dissymmetry factor in the 10^(-3) order but also displayed obvious room temperature phosphorescence(RTP).The relationship between this innovative helical unit and unique photophysical properties,including ultraviolet MR-TADF,CPL,and RTP,was reasonably revealed.

关键词： polycyclic aromatic heterocycles thermally activated delayed fluorescence multi-resonance effect ultraviolet emission circularly polarized luminescence room temperature phosphorescence

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10BaF_2:NaF,Na_3AlF_6/TiO_2 composite as a novel visible-light-driven photocatalyst based on upconversion emission

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Chinese Physics B 2012年第4期21卷 249-256页

作者：刘恩周樊君胡晓云侯文倩代宏哲 School of Chemical Engineering Northwest UniversityXi'an 710069China Department of Physics Northwest UniversityXi'an 710069China

A rare-earth free upconversion luminescent material, 10BaF2：NaF, Na3AIF6, is synthesized by a hydrothermal method. The study of fluorescent spectrum indicates that it can convert visible light （550 nm-610 nm） into ultraviolet light （290 nm 350 nm）, and two emission peaks at 304 nm and 324 nm are observed under the excitation of 583 nm at room temperature. Subsequently, 10BaF2：NaF, Na3AIF6/TiO2 composite photocatalyst is prepared and its catalytic activity is evaluated by the photocatalytic reduction of CO2 under visible light irradiation （λ〉 515 nm）. The results show that 10BaF2：NaF, Na3AIF6/TiO2 is a more effective photocatalyst for CO2 reduction than pure TiO2, their corresponding methanol yields are 179 and 0 μmol/g-cat under the same conditions. Additionally, the mechanism of photocatalytic reduction of CO2 on 10BaF2：NaF, Na3AIF6/TiO2 is proposed.

关键词： rare-earth free upconversion luminescent material ultraviolet emission titanium dioxide photocatalytic reduction of CO2

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Aggregation-induced narrowband isomeric fluorophores for ultraviolet nondoped OLEDs by engineering multiple nonbonding interactions

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Aggregate 2023年第6期4卷 191-199页

作者： Yumiao Huo Haoyuan Qi Shuyao He Jie Li Shuping Song Jichen Lv Yuchao Liu Ling Peng Shian Ying Shouke Yan Key Laboratory of Rubber-Plastics Ministry of EducationSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdaoP.R.China College of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoP.R.China College of Chemistry and Chemical Engineering Heze UniversityHezeP.R.China State Key Laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijingP.R.China

Traditional donor-acceptor type organic luminescent materials usually suffer from unfavorable spectral broadening and fluorescence quenching problems arising from strong inter/intra-chromophore interactions in aggregation ***,two ultraviolet carbazole-pyrimidine isomers(named o-DCz-Pm and m-DCz-Pm)with novel aggregation-induced narrowband phenomenon are constructed and systematic investigated by experiments and theoretical *** from strengthened steric hindrance and multiple noncovalent interactions,the nonradiative decay,vibrational motion,and structural relaxation of singlet state can be effectively suppressed in aggregation ***,the electroluminescence peak of 397 nm,full width at half maximum of 21 nm and external quantum efficiency of 3.4%are achieved simultaneously in nondoped o-DCz-Pm-based *** work paves an avenue toward the development of high-performance narrowband nondoped ultraviolet materials and organic light-emitting diodes.

关键词： aggregation-induced narrowband carbazole-pyrimidine derivatives,nonbonding interactions organic light-emitting diodes ultraviolet emission

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Synthesis, Crystal Structure, Physical Properties, and Application of a Series of Functional Dibenzo[d,f][1,3]dioxepine Derivatives

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Chemical Research in Chinese Universities 2008年第6期24卷 798-804页

作者： ZHANG Hai-quan ZHANG Cheng-bo ZHENG Yan YANG Bing MA Yu-guang State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 P. R. China State Key Lab for Supramolecular Structure and Materials Jilin University Changchun 130012 P. R. China

The twisted aromatics, functional dibenzo[d,f][1,3]dioxepine derivatives were synthesized in high yields from reactions of 5,5＇-dibromo-2,2＇-biphenol with corresponding ketal or ketone compounds under acid catalysis. The structures of these compounds were characterized by ^1H NMR, elemental analysis, UV-Vis absorption spectrum and X-ray diffraction analysis. The conformation of O--C--O bridged biphenyl derivatives with varied substitute groups on 6,6＇-position was studied by X-ray crystallography and force-field simulation. The result of calculations by UNIVERSAL 1.02 force field in Cerius2 package（4.6） indicates that dibenzo[d,f][1,3]dioxepine derivatives show twisted conformations and the twisted angle between the phenyl rings is about 40°, which is accordant with the result from crystal structure determination, though the obtained angles in the crystal of dibenzo[d,f][1,3]dioxepine derivatives with the varied substitute groups on 6,6＇-position are shown to be slightly shifted to 40° owing to intermolecular interactions in crystal stacking. DSC studies exhibit that the substitute groups on 6,6＇-position can induce a large variation of endothermic peaks ranging from 80 to 135 ℃. The conjugated polymers based on dibenzo[d,f][1,3]dioxepine derivatives, which have ultraviolet emitting with a quantum efficiency of 10%, were obtained by Yamamoto coupling.

关键词： Dibenzo[d,f]dioxepine Twisted angle Crystal structure Twisted conformation ultraviolet emission

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