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Science China(Physics,Mechanics & Astronomy) 2010年第1期53卷 24-29页

作者： CHEN Ping, LEI YanLian, LIU Rong, ZHANG QiaoMing, ZHANG Yong & xiong zuhong School of Physical Science and Technology, MOE key laboratory on luminescence and real-time analysis, Southwest University, Chongqing 400715, China 1. School of Physical Science and Technology MOE Key Laboratory on Luminescence and Real-Time Analysis Southwest University Chongqing 400715 China

The DCM dye doped organic electroluminescence devices with structure of ITO/NPB/Alq 3 : DCM/Alq 3 /LiF/Al were fabricated. From 15 K to room temperature, the magnetic field dependent of electroluminescence (MEL) of devices was investigated. Our observations indicated that the MEL is composed of two effects in different regimes: a low field (0≤B≤40 mT) effect and a high field (B > 40 mT) effect. For undoped devices, the low field effect exhibits a rapid rising with the increasing field, and the high field effect shows a slow increase and gradually saturates at room temperature. For doped devices, the low field rapid increase is also present, whereas the high field effect displays a decrease with the increasing field. The larger the injection current is, the more apparent the high field decrease is. In addition, the doped device demonstrates less temperature dependence of the high field effect than undoped device, although the undoped devices also present high field decrease of electroluminescence at low temperatures (T≤150 K). Based on the energy level trapping effect due to dye doping and magnetic field modulated triplet exciton annihilation, the experimental results are carefully explained.

关键词： dye doping magnetic field dependent of electroluminescence energy level traps triplet exciton annihilation

Investigation of hole injection characteristics in NPB/Alq3 heterojunction devices

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Investigation of hole injection characteristics in NPB/Alq3 ...

Color-Tunable Hybrid White Organic Light-Emitting Diodes with Double Interlayers

2010亚洲光电子会议LED和显示技术分会场

作者： Denghui Xu a,xiong Li a,Zhaoyue Lv b,Ye Zou b,Zhenbo Deng b a School of Mechanical Engineering,Beijing Technology and Business University,Beijing 100037,P.R.China b key laboratory of luminescence and Optical Information,ministry of education,Institute of Optoelectronic Technology,Beijing Jiaotong University,Beijing 100044,P.R.China

The effect of ozone and O 2 plasma treatment of ITO on the charge-carrier injection in ITO/N,N’-bis-（1-napthyl）-N,N’diphenyl-1,1’biphenyl-4,4’-diamine（NPB）/tris（8-quinolinolato）-aluminum（Alq 3）/Al organic heterojunction devices have been studied through the analysis of current-voltage *** the experiments,it is demonstrated that the average electric field inside Alq 3 layer is larger than the average field in the NPB *** investigation demonstrated that the hole injection into NPB from anode is Fowler-Nordheim（FN） tunneling and the electron injection into Alq 3 from cathode is Richardson-Schottky（RS） thermonic emission.

关键词： Ohmic contact Organic light-emitting diodes(OLEDs) hole

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Optics and Photonics Journal 2017年第8期7卷 99-105页

作者： Chunhong Gao Ziyang xiong Fuxing Yu Xingjuan Ma Yue Zhang Xin Zeng zuhong xiong School of Physical Science and Technology MOE Key Laboratory on Luminescence and Real-Time Analysis Southwest University Chongqing China

An efficient color-tunable hybrid white organic light-emitting diode is demonstrated with double interlayers of 2,7-bis(carbazol-9-yl)-9,9-ditoylfluo- rene/2-(diphenylphosphoryl) spiroflu-orene (DMFL-CBP/SPPO1) inserted between blue fluorescent and yellow phosphorescent-emitting layers, and exhibits Commission Internationale de l’Eclairage (CIE1931) ranging from warm white (0.4368, 0.4497) to cool white (0.2781, 0.2896) with driving current density from 0.2 to 40 mA/cm2. The recombination of singlet and the triplet excitons in blue fluores-cent-emitting layer and yellow phosphorescent-emitting layer, respectively, can be modulated by both the thickness of these double interlayers and the applied current densities.

关键词： Hybrid White Organic Light-Emitting Diode Color-Tunable Singlet Exciton Triplet Exciton Phosphor

柯楠因诱导寡聚腺嘌呤核苷酸双螺旋结构增强赛博绿Ⅰ荧光及柯楠因的高灵敏和高选择荧光检测

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化学学报 2012年第3期70卷 352-356页

作者：周亚文李春梅熊祖洪黄承志西南大学化学化工学院发光与实时分析教育部重点实验室重庆400715 西南大学物理科学与技术学院重庆400715 西南大学药学院重庆400716

柯楠因是原小檗碱类生物碱类似物.研究发现,在近生理酸度下柯楠因与寡聚腺嘌呤核苷酸(poly A16)形成双链结构,明显增强DNA嵌入染料赛博绿I(SG I)的荧光.在优化条件下,530 nm处荧光增强与60～600 nmol/L的柯楠因呈线性关系,检测限(3σ)为... 详细信息

柯楠因是原小檗碱类生物碱类似物.研究发现,在近生理酸度下柯楠因与寡聚腺嘌呤核苷酸(poly A16)形成双链结构,明显增强DNA嵌入染料赛博绿I(SG I)的荧光.在优化条件下,530 nm处荧光增强与60～600 nmol/L的柯楠因呈线性关系,检测限(3σ)为30 nmol/L.方法选择性好,同倍含量的小檗碱类似物不产生干扰.将所建立的方法用于柯楠因合成样的测定,回收率在92.5%～105%之间,相对标准偏差RSD小于3.1%(n=3).

关键词：柯楠因寡聚腺嘌呤核苷酸赛博绿Ⅰ 荧光分光光度法

Monodisperse Spherical Sandwiched Structured SiO_(2)@CsPbX_(3)@SiO_(2) Perovskite Composites for the Determination of Fe^(3+) Ion in Water Samples

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Journal of analysis and Testing 2021年第1期5卷 40-50页

作者： Xiao-Hong Tan Guo-Bin Huang Zhi-xiong Cai Fei-Ming Li Yan-Mei Zhou Mao-Sheng Zhang College of Chemistry Chemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou 363000China Institute of Analytical Technology and Smart Instruments and Colleague of Environment and Public Healthy Xiamen Huaxia UniversityXiamen 361024China Fujian Province key laboratory of Modern Analytical Science and Separation Technology Minnan Normal UniversityZhangzhou 363000China

The application of all-inorganic CsPbX_(3)(X=Cl^(-),Br^(-)and I^(-))perovskite nanocrystals(PNCs)is hindered by their poor stability under diff erent environments(moisture,UV light and high temperature).Herein,we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO_(2)@CsPbX_(3)@SiO_(2)perovskite *** this strategy,the environmental stability of CsPbX_(3)PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure,and the negative eff ects of SiO_(2)coating on photoluminescence property of CsPbX_(3)PNCs could be reduced eff ***,regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative *** experiment results indicate that the as-prepared product have outstanding abilities of water-,oxidation-and UV radiation ***,the SiO_(2)@CsPbBr_(3)@SiO_(2)perovskite composites are successfully used for highly sensitive detection of Fe^(3+)in water *** results show limit of detection(LOD)is 3μM and good linearity is between 10 and 70μM(R^(2)=0.9963).Furthermore,the proposed perovskite composites have been successfully applied for the analysis of Fe^(3+)in real samples with satisfactory results.

关键词： Perovskite nanocrystals luminescence Detection Fe^(3+)

Nd^3＋掺杂的NaYF4：Yb@NaYF4：Ho上转换纳米颗粒的光谱分析

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无机材料学报 2017年第2期32卷 180-184页

作者：熊茂珍叶帅王广盛宋军屈军乐深圳大学光电工程学院教育部光电子器件与系统重点实验室深圳518060

上转换纳米颗粒因具有良好的穿透深度和发光强度被广泛地应用在生物标记或生物成像中。实验制备了核壳结构的NaYF_4:Yb@NaYF_4:Ho纳米颗粒,分散均匀,粒径在50 nm左右。通过光谱分析可知,该纳米颗粒可在980 nm激光激发下发射波长为650 n... 详细信息

上转换纳米颗粒因具有良好的穿透深度和发光强度被广泛地应用在生物标记或生物成像中。实验制备了核壳结构的NaYF_4:Yb@NaYF_4:Ho纳米颗粒,分散均匀,粒径在50 nm左右。通过光谱分析可知,该纳米颗粒可在980 nm激光激发下发射波长为650 nm为主的发射光。进一步对该核壳结构的NaYF_4:Yb@NaYF_4:Ho纳米颗粒进行Nd^(3+)掺杂,制备了可被800 nm激光激发且发射强红光的纳米颗粒。通过比较多种不同结构的Nd^(3+)掺杂NaYF_4:Yb@NaYF_4:Ho纳米颗粒的荧光光谱发现,NaYF_4:Yb@NaYF_4:Ho,Nd纳米颗粒发射光最强,表明Nd^(3+)掺杂在NaYF_4:Yb@NaYF_4:Ho纳米颗粒的壳层中最佳。最后对NaYF_4:Yb^(3+)50%@NaYF_4:Ho^(3+)1%,Nd^(3+)x%纳米颗粒Nd^(3+)离子的掺杂浓度进行优化,实验结果表明:Nd^(3+)掺杂浓度为30%时,该纳米颗粒在800 nm激光激发下发光强度最强。

关键词：上转换纳米颗粒 Nd3+掺杂核壳结构

基于亲水性可控棉线有效分离苏丹I和罗丹明B

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材料导报 2021年第20期35卷 20166-20175页

作者：熊静李亚丹伍亮肖刚王鑫梁莉萍乔琰鲁志松余玲发光分析与分子传感教育部重点实验室(西南大学) 重庆400715 西南大学材料与能源学院洁净能源与先进材料研究院重庆400715 西南大学食品科学学院重庆400715

近年来,食品安全问题引起了人们的广泛关注。非食用色素因价格低廉、着色能力强而被非法用于食品加工过程,严重威胁消费者生命健康。苏丹I和罗丹明B是食品加工中最常被滥用的两种典型非食用有机着色剂,进入人体后会在相应酶的作用下产... 详细信息

近年来,食品安全问题引起了人们的广泛关注。非食用色素因价格低廉、着色能力强而被非法用于食品加工过程,严重威胁消费者生命健康。苏丹I和罗丹明B是食品加工中最常被滥用的两种典型非食用有机着色剂,进入人体后会在相应酶的作用下产生致癌物。高效液相色谱法是用于违禁色素分离检测的主要方法,但该方法所需仪器昂贵,专业程度高且操作繁琐,限制了其在色素鉴定中的应用。棉线作为一种低成本固定相已被用于有机色素的色谱分离,但是对于其亲疏水性在色素分离中的作用目前仍不清楚,也未见将该系统直接用于色素分离收集的报道。针对上述问题,本研究采用等离子体可控预处理的方式实现对棉线亲疏水性能的调控,并进一步探究了棉线亲疏水性在棉线基色谱分离和收集过程中的作用。在等离子体处理过程中,调整了棉线的缠绕方式、等离子体功率和暴露时间,并通过扫描电镜、接触角测试和线上液体流动实验对棉线内部结构以及棉线亲疏水性进行了表征。结果表明,等离子体处理并不影响棉线的加捻结构和纤维间空隙大小;棉线以“之”字形悬空缠绕在支架上可增大暴露面积,从而获得更高的亲水性能;棉线的亲水性高度依赖于等离子处理时间和仪器功率,在10.15 W的等离子机中处理8 min被证明是最佳处理参数,可使棉线具有最高的亲水性能。X射线光电子能谱分析(XPS)表明,经等离子体处理后棉线的含氧基团显著增多,这可能是棉线亲水性提高的原因。以乙醇/水溶液为展开剂,探究了棉线亲水性对色素分离的影响,发现棉线亲水性提高可以显著增强色素的分离效果。色素与棉线的结合力以及流动相在棉线上的流动能力可能是色素分离效果的决定性因素。在色素分离收集实验中,分别以乙醇/水溶液和甲酸/甲醇溶液作为展开剂对罗丹明B和苏丹I进行分离收集,并对不同阶段的洗脱液进行了紫外吸收光谱分析。在乙醇/水溶液体系中,两种色素虽然可先后通过棉线固定相,但在苏丹I洗脱液中仍然含有微量的罗丹明B;而在甲酸/甲醇溶液体系中,两种色素可以更有效地分离,且分离速度更快。综上,本研究揭示了亲水性在线基色谱系统中的关键作用,开发了一种简便、低廉和易于操作的线基色素分离方法,并将其用于非食用色素苏丹I和罗丹明B的有效分离和收集。本研究有望为高性能线基色谱分离系统的设计和构建提供理论指导,并进一步拓展线基流控分离方法的应用领域。

关键词：棉线色谱法亲水性微流体色素分离