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NHC-derived carbon-centered luminescent radicals with shortwavelength emission via suppression of Kasha's rule

Science China Chemistry 2024年第8期67卷 2679-2685页

作者： Can Chen Xin Li xinhua ouyang Ying-Feng Han Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China College of Material Engineering Fujian Agriculture and Forestry University Fuzhou 350108China

Luminescent organic radicals have garnered increasing attention owing to their versatile applications in sensing, imaging, and organic light-emitting diodes(OLEDs), attributed to their unique emission properties originating from the doublet spin ***, the natural narrow bandgap of organic free radicals typically limits their emission to the long-wavelength *** luminescent organic radicals with short-wavelength emission remains a significant challenge. Herein, a series of carbon-centered radicals with short-wavelength emission(383–476 nm) by combining N-heterocyclic carbenes with various polycyclic aromatic hydrocarbons(PAHs)(2-naphthyl, 2a~Ⅰ and 2b~Ⅰ;2-phenanthryl, 2a~Ⅱand 2b~Ⅱ;2-anthryl, 2a~Ⅲand 2b~Ⅲ;3-phenanthryl, 2a~Ⅳand 2b~Ⅳ). Theoretical calculations reveal that the introduction of PAHs significantly increases the ΔE_(D2-D1) in 2a^(Ⅰ–Ⅲ)and 2b^(Ⅰ–Ⅲ)compared to that in phenyl-derived radical congeners. Consequently, the internal transition from D2 to D1 is impeded, leading to a high yield of D2 emission and a suppressed Kasha's rule, thereby overcoming the limitations imposed by their narrow bandgap. For 2a~Ⅳ and 2b~Ⅳ, despite a moderately large ΔED2-D1value, the ΔED3-D1value exceeds 1 e V, indicating that their emission likely originates from the D3 state. Furthermore, we utilized 2a~Ⅲand 2b~Ⅲ as emissive materials in OLEDs,resulting in blue emissions with external quantum efficiencies of 7.5% and 6.5%, respectively.

关键词： N-heterocyclic carbenes luminescent organic molecules carbon-centered radicals short-wavelength emission

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Ecofriendly Hydroxyalkyl Cellulose Additives for Efficient and Stable MAPbI_(3)-Based Inverted Perovskite Solar Cells

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Energy & Environmental Materials 2023年第5期6卷 251-259页

作者： Xuefeng Zhu Rui Lin Hao Gu Huichao Hu Zheng Liu Guichuan Xing Yibing Wu xinhua ouyang College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078China

Perovskite solar cells(PSCs)have been demonstrated to be one of the most promising technologies in the field of renewable ***,the presence of the defects in the perovskite films greatly limits the efficiency and the stability of the *** additive engineering is one of the most effective approaches to overcome this *** of the successful additives are extracted from the petroleum-based materials,while the research on the biomass-based additives is still lagging *** this paper,two ecofriendly hydroxyalkyl cellulose additives,i.e.,hydroxyethyl cellulose(HEC)and hydroxylpropyl cellulose(HPC),are investigated on the performance of the MAPbl_(3)-based inverted *** to the strong interaction between the hydroxyl groups of the cellulose and the divalent cations of the perovskite,these additives enhance the crystal grain orientation and significantly repair the defects of the perovskite *** as the additives,these two cellulose derivatives show a strong passivation ability,which significantly reduces the trap density and improves the optoelectronic feature of the *** with the average power conversion efficiency(PCE)of the control device(19.19%),an enhancement of~10%is achieved after the addition of *** optimized device(PCE=21.25%)with a long-term stability(10:80 h,PCE=20.93%)is achieved by the incorporation of the HEC additives into the precursor *** is the best performance among the PSCs with the cellulose additives up to *** research provides a novel choice to develop a cost-effective and renewable additive for the PSCs with high efficiency and excellent long-term stability.

关键词： additives hydroxyalkyl cellulose inverted perovskite solar cells MAPbl_(3)

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Carboxy Cellulose as Cathode Interfacial Layer for Efficient Organic Solar Cells

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Paper And Biomaterials 2020年第1期5卷 14-21页

作者： Yanjun Liu Cheng Hu Junying Wu Amjad Islam xinhua ouyang College of Materials Engineering Fujian Agriculture and Forestry UniversityFuzhouFujian Province350002China

Green, biodegradable, and eco-friendly interface materials based on cellulose and its derivatives were prepared for organic solar cells(OSCs). In this work, calcium and two derivatives of cellulose with different carboxy acid groups, denoted as Cellulose-COOH and Cellulose-(COOH)n, were used as cathode interfacial layers of OSCs, and a blend of the low-band-gap semiconducting polymers thieno[3, 4-b]thiophene/benzodithiophene(PTB7)and [6, 6]-phenyl C71-butyric acid methyl ester(PC71BM) was chosen as the photoactive layer. OSCs were fabricated with a configuration of indiumdoped tin oxide(ITO)/poly(3, 4-ethylenedioxythiophene) : polystyrene sulfonate(PEDOT: PSS)/PTB7: PC71BM/Ca or Cellulose-COOH or Cellulose-(COOH)n/Al. As a result, the effect of cellulose-COOH was the best one among them, and the power conversion efficiency(PCE) reached 8.21%for the devices with cathode interfacial layer of Cellulose-COOH, which was better than that of OSCs using calcium as a modifier(PCE=7.95%). The favorable performance is attributed to the reduced work function and improved electron transfer caused by the introduction of carboxy cellulose between the active layer and the electrode. The developed technology shows great potential in accelerating the diversified applications of cellulose and producing cost-effective and eco-friendly interfaces for OSCs.

关键词： carboxy cellulose cathode interfacial layer organic solar cell

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Green and Effective Ammonium Carbonate-assisted Process for Drying Hemicellulose Obtained through Alkali Extraction of Bleached Bamboo Kraft Pulp

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Paper And Biomaterials 2021年第1期6卷 1-10页

作者： Xiaoqi Gong Zongwei Zhang Yonghao Ni xinhua ouyang Lihui Chen Liulian Huang Huichao Hu College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhouFujian Province350002China Department of Chemical Engineering University of New BrunswickFrederictonNew BrunswickE3B 5A3Canada

Hemicellulose has a wide range of applications,including that as an emulsifier for the food industry and raw material for the synthesis of bioethanol/biochemicals and biodegradable *** is usually present as a spent liquor,such as the prehydrolysis liquor of the prehydrolysis kraft dissolving pulp production process and the alkali extraction liquor of the cold caustic extraction of pulp *** to its dilute nature,hemicellulose needs to be dried for practical utilization,and this is *** this study,cellulose and hemicellulose in a bleached bamboo kraft pulp were separated using an alkali extraction *** obtained from the extraction liquor was dried by an ammonium carbonate-assisted drying *** effects of drying time and drying temperature were *** of the hemicellulose obtained by the ammonium carbonate-assisted drying process was similar to that of original hemicellulose,as revealed by detailed Fourier transform infrared and X-ray diffraction *** novel drying method was more energy efficient and required a shorter drying time than the conventional freeze drying method,and the excellent solubility in alkaline solutions favored the chemical modification of *** dried hemicellulose can be used as a renewable raw material for the preparation of hydrogels and other substances such as bioethanol/biochemicals and biodegradable films.

关键词： bamboo kraft pulp hemicellulose alkali extraction ammonium carbonate drying process dissolving pulp

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新型含噻吩基8-羟基喹啉锌配合物的合成及光电性能

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高等学校化学学报 2014年第1期35卷 48-53页

作者：汤胤旻霍延平胡升张焜赵丰华欧阳新华广东工业大学轻工化工学院广州510006 中国科学院宁波材料技术与工程研究所宁波315201

设计合成了含噻吩基的新型配体(E)-2-[2-(3-噻吩基)乙烯基]-8-羟基喹啉(4)及相应的锌配合物5,产物结构经核磁共振、红外光谱和元素分析进行表征.利用X射线单晶衍射仪测定了中间体(E)-2-[2-(3-噻吩基)乙烯基]-8-乙酰氧基喹啉(3)和配体4... 详细信息

设计合成了含噻吩基的新型配体(E)-2-[2-(3-噻吩基)乙烯基]-8-羟基喹啉(4)及相应的锌配合物5,产物结构经核磁共振、红外光谱和元素分析进行表征.利用X射线单晶衍射仪测定了中间体(E)-2-[2-(3-噻吩基)乙烯基]-8-乙酰氧基喹啉(3)和配体4的单晶结构,结果表明中间体3晶体分子间并无明显的氢键作用,分子间呈交错堆叠;配体4分子之间由硫氢氧键弱作用相互排列形成网状结构.通过核磁滴定及紫外和荧光滴定模拟了配体4在溶液中与金属锌的配位过程.固体荧光寿命研究结果表明,配合物5的荧光寿命为18.8 ms.通过电致发光器件研究发现,配合物5作为发光层具有良好的电致发光性能,同时具有较好的电子传输能力.

关键词：噻吩 8-羟基喹啉锌配合物核磁滴定荧光寿命电致发光器件

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可湿法加工有机小分子发光材料研究进展

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有机化学 2013年第10期33卷 2063-2079页

作者：陆天华霍延平方小明欧阳新华广东工业大学轻工化工学院广州510006 中国科学院上海有机化学研究所有机氟化学中国科学院重点实验室上海200032 中国科学院宁波材料技术与工程研究所宁波315201

综述了近年来国内外可湿法加工有机小分子发光材料的研究状况,对可湿法加工有机小分子发光材料按发光颜色进行分类,对其分子结构特点、热稳定性、电学性质、光电学性质、发光效率等进行介绍.并介绍了可湿法加工有机小分子发光材料的设... 详细信息

综述了近年来国内外可湿法加工有机小分子发光材料的研究状况,对可湿法加工有机小分子发光材料按发光颜色进行分类,对其分子结构特点、热稳定性、电学性质、光电学性质、发光效率等进行介绍.并介绍了可湿法加工有机小分子发光材料的设计方法及发展趋势.

关键词：湿法加工有机小分子发光材料

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食品加工中食源性致病菌的危害和预防措施

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现代食品 2023年第3期29卷 147-150页

作者：欧阳新华九江市行政审批局江西九江332000

食源性致病菌污染食品后会给人体健康带来极大的伤害,因此食品企业在生产的过程中应该加强管理,并制定相关制度对食源性致病菌进行预防和控制。本文针对食品中的食源性致病菌沙门氏菌、金黄色葡萄球菌、单核细胞增生李斯特氏菌的来源和... 详细信息

食源性致病菌污染食品后会给人体健康带来极大的伤害,因此食品企业在生产的过程中应该加强管理,并制定相关制度对食源性致病菌进行预防和控制。本文针对食品中的食源性致病菌沙门氏菌、金黄色葡萄球菌、单核细胞增生李斯特氏菌的来源和危害进行系统分析,以期为食品中食源性致病菌的控制和预防提供一定的指导建议。

关键词：食源性致病菌危害预防措施

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钢筋混凝土单筋矩形截面受弯构件的经济截面设计

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江西煤炭科技 2006年第1期 79-80页

作者：欧阳新华江西省煤炭综合利用设计院江西萍乡337000

通过钢筋混凝土矩形截面受弯构件截面经济设计,采用假设前提,基本应用公式,确定受弯构件经济截面,降低受弯构件造价,取得合理设计意义。

关键词：几点假设基本公式经济截面

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我国固体饮料产业的安全问题与监管建议

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食品安全导刊 2022年第32期 22-24,28页

作者：欧阳新华九江市行政审批局江西九江332000

近年来我国固体饮料产业发展迅猛,但其安全问题一直备受社会关注。本文从产业实践的视角出发,系统分析了固体饮料存在的质量安全风险,结合当前我国已颁布的有关固体饮料监管政策与现行标准,探讨了我国固体饮料标准的发展趋势,围绕现实... 详细信息

近年来我国固体饮料产业发展迅猛,但其安全问题一直备受社会关注。本文从产业实践的视角出发,系统分析了固体饮料存在的质量安全风险,结合当前我国已颁布的有关固体饮料监管政策与现行标准,探讨了我国固体饮料标准的发展趋势,围绕现实问题提出了针对性的对策建议,旨在为食品安全生产、市场监督管理、保障食品安全等方面提供一定的理论依据。

关键词：固体饮料食品安全食品监管

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基于FHQZn发光的色度稳定的有机白光器件

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固体电子学研究与进展 2009年第2期29卷 249-253页

作者：丁桂英姜文龙韩强张刚欧阳新华曾和平吉林师范大学信息技术学院吉林四平136000 华南理工大学化学与化工学院广州510641

研究了一种新型发光材料(E)-2-(2-(9H-fluoren-2-yl)vinyl)quinolato-Zinc的发光性能,利用它的空穴传输和发光特性制备了有机白光器件,器件的结构为:ITO/2T-NATA(15nm)/FHQZn(38nm)/NPB(25nm)/BCP(10nm)/Alq(30nm)/LiF(0.5nm)/Al,其中,(E)-2-(2-(9H-fluoren-2-yl)vinyl)quinoato-Zinc(FHQZn)作为空穴传输层和黄橙色发射层,N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine(NPBX)作为蓝光发射层。器件最大的电流效率为1.68cd/A(at7V),最大的亮度为4624cd/m2(at12V),此时色坐标为(0.28,0.25)。器件的色坐标由7V(66.83cd/m2)时的(0.27,0.29)到12V(4624cd/m2)时的(0.28,0.25)几乎不变,是一个基于新型材料的色度较稳定的有机白光器件。

关键词：白色有机电致发光器件空穴传输/发光材料性能

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