搜索到20539篇“ PHOTOLUMINESCENT“的相关文章
Eu@UiO-66-(COOH)_(2)荧光体系的构建和重金属离子检测的应用
2024年
铜是生命体的必需营养素,也是典型的重金属污染物,因此对生命体和水体中的铜进行高灵敏度和高选择性的检测对于生态环境、食品安全和人类健康具有重要意义。镧系金属有机框架(Ln-MOFs)在结构与发光方面的优异性能,可以实现对镧系离子(Ln^(3+))荧光强度变化定性/定量的特异性探测,但是Ln^(3+)的高配位数、结构不易控制、水稳定性差等缺点限制了Ln-MOFs在水溶液检测中的实际应用。本文通过后合成修饰的方法,得到了一种镧系离子掺杂的Eu@UiO-66-(COOH)_(2),该Ln-MOF材料具有良好的稳定性和荧光性能,能够对水溶液中的Cu^(2+)进行探测,响应时间30 s,检测限低至0.63μmol/L,在干扰阳离子共存的复杂条件下仍然呈现出高灵敏度的荧光检测性能。该研究为今后Ln-MOFs荧光传感材料的设计与环境相关领域应用提供了重要参考。
高源李猛于睿周子涵高禹蒋荣立张吉雄
关键词:荧光传感干扰离子检测限
Stimuli-responsive photoluminescent copper(Ⅰ) halides for scintillation, anticounterfeiting, and light-emitting diode applications
2024年
Highly sensitive stimuli-responsive luminescent materials are crucial for appli-cations in optical sensing,security,and anticounterfeiting.Here,we report two zero-dimensional(0D)copper(I)halides,(TEP)_(2)Cu_(2)Br_(4),(TEP)_(2)Cu_(4)Br_(6),and 1D(TEP)_(3)Ag_(6)Br_(9),which are comprised of isolated[Cu_(2)Br_(4)]^(2-),[Cu_(4)Br_(6)]^(2-),and[Ag_(6)Br_(9)]3-polyanions,respectively,separated by TEP^(+)(tetraethylphosphonium[TEP])cations.(TEP)_(2)Cu_(2)Br_(4) and(TEP)_(2)Cu_(4)Br_(6) demonstrate greenish-white and orange-red emissions,respectively,with near unity photoluminescence quantum yields,while(TEP)_(3)Ag_(6)Br_(9) is a poor light emitter.Optical spectroscopy mea-surements and density-functional theory calculations reveal that photoemissions of these compounds originate from self-trapped excitons due to the excited-state distor-tions in the copper(I)halide units.Crystals of Cu(I)halides are radioluminescence active at room temperature under both X-andγ-rays exposure.The light yields up to 15,800 ph/MeV under 662 keVγ-rays of ^(137)Cs suggesting their potential for scintillation applications.Remarkably,(TEP)_(2)Cu_(2)Br_(4) and(TEP)_(2)Cu_(4)Br_(6) are inter-convertible through chemical stimuli or reverse crystallization.In addition,both compounds demonstrate luminescence on-off switching upon thermal stimuli.The sensitivity of(TEP)_(2)Cu_(2)Br_(4) and(TEP)_(2)Cu_(4)Br_(6) to the chemical and thermal stimuli coupled with their ultrabright emission allows their consideration for applications such as solid-state lighting,sensing,information storage,and anticounterfeiting.
Dilruba A.PopyYashpal SinghYauhen TratsiakAbby M.CardozaJohn M.LaneLuis StandMariya ZhuravlevaNeeraj RaiBayram Saparov
关键词:SCINTILLATORS
Multi-state photoluminescent properties of an overcrowded alkene-based molecular motor in aggregates
2024年
Photoisomerization and photoluminescence are two distinct energy dissipation path-ways in light-driven molecular motors.The photoisomerization properties of discrete molecular motors have been well established in solution,but their photoluminescent properties have been rarely reported-especially in aggregates.Here,it is shown that an overcrowded alkene-based molecular motor exhibits distinct dynamic prop-erties in solution and aggregate states,for example,gel and solid states.Despite the poor emissive properties of molecular motors in solution,a bright emission is observed in the aggregate states,including in gel and the crystalline solid.The emis-sion wavelength is highly dependent on the nature of the supramolecular packing and order in the aggregates.As a result,the fluorescent color can be readily tuned reversibly via mechanical grinding and vapor fuming,which provides a new platform for developing multi-stimuli functional materials.
Yahan ShanJinyu ShengQi ZhangMarc C.A.StuartDa-Hui QuBen L.Feringa
关键词:PHOTOLUMINESCENCE
新型碳量子点荧光探针的制备及其对Mn^(2+)的选择性检测
2024年
以中药材厚朴为碳源,采用水热法制备得到荧光碳量子点(CQDs),并构建了Mn^(2+)荧光探针。碳量子点表现出良好的荧光性能,最大激发波长为285 nm,最大发射波长为425 nm,荧光量子产率为28.4%。Mn^(2+)荧光探针具有良好的选择性、优异的抗干扰能力和较高的灵敏度,在Mn黄小梅浓度为0.2~800μmol/L范围内,(I0-I)/I与Mn^(2+)浓度呈现出良好的线性关系,相关系数为0.9996,检测限为52 nmol/L。通过添加5μmol/L、50μmol/L和100μmol/L的Mn^(2+)来检测真实水样中的Mn^(2+),相对标准偏差为0.9%~2.9%,回收率为98.8%~101.5%,该新型碳量子点荧光探针在Mn^(2+)的环境分析中具有广阔的应用前景。
邓祥黄小梅邓子禾李敏龚安界黄涛
关键词:锰离子荧光猝灭
马来酰胺酸-醋酸乙烯酯交替共聚物的光致发光性能及荧光水凝胶的制备
2024年
马来酸酐-醋酸乙烯酯交替共聚物及其衍生物是一类非共轭光致发光聚合物,在防伪、转光等领域具有很好的应用前景.本研究对自稳定沉淀聚合法制备的马来酸酐-醋酸乙烯酯交替共聚物(PMV)微球进行了酰胺化和酰亚胺化改性,制备出了光致发光的水溶性马来酰胺酸-醋酸乙烯酯交替共聚物PMVN.通过对其光致发光性能的研究,发现其在室温和85℃下溶解的溶液及固体呈现出不同颜色及荧光特征,85℃下溶解的溶液及固体还呈现出蓝、红双发射的特性.在此研究结果基础上,成功制备出荧光水凝胶,所制备的光致发光聚合物和荧光水凝胶在疾病诊断、防伪和环境监测等方面具有很好的应用前景.
郭照琰高易茹越刘振杰张晓红乔金樑
Temperature-dependent photoluminescent behavior of millimeter-scale Cs_(4)PbBr_(6)/CsPbBr_(3) bulk crystals and their application to white light-emitting diodes
2024年
The zero-dimensional perovskite composite Cs_(4)PbBr_(6)/CsPbBr_(3) has attracted significant attention for its remarkable photoluminescence(PL),which remains highly effective even in solid state.This work presents a detailed analysis of the steady-state and time-resolved PL(TRPL)behavior of millimeter-scale Cs_(4)PbBr_(6)/CsPbBr_(3) crystals over a temperature range of 80 to 360 K,which covers exciton binding en-ergy,phonon energy,and PL peak energy shifting with increasing temperature.According to the results,Cs_(4)PbBr_(6)/CsPbBr_(3) exhibits high exciton binding energy and phonon energy,with calculated values of 358.7 and 94.8 meV,respectively.Specifically,when the temperature is below~235 K,thermal expan-sion dominates to influence the TRPL and peak energy,whereas electron-phonon interaction becomes the dominant factor as temperature rises from 235 to 325 K.It is found that Cs_(4)PbBr_(6)/CsPbBr_(3) has a PL behavior similar to CsPbBr_(3),and characterization and TRPL results demonstrate that nanometer-scale CsPbBr_(3) crystals embed in the Cs_(4)PbBr_(6) bulk matrix.Meanwhile,a white light-emitting diode(WLED)device based on Cs_(4)PbBr_(6)/CsPbBr_(3) with luminous efficiency of 64.56 Im/W is fabricated,and its color coordinate is measured as(0.34,0.31)under 20 mA,which is in close proximity to the standard white color coordinate.Moreover,the color gamut of the device is measured as 128.66%of the National Televi-sion Systems Committee(NTSC).The WLED electroluminescence(EL)spectra show high Correlated Color Temperature(CCT)stability for the working current varying from 5 to 100 mA,and after continuous oper-ation for 12 h,the EL intensity decreases and stabilizes at~70%of the initial EL intensity.These findings suggest that Cs_(4)PbBr_(6)/CsPbBr_(3) crystals are a promising candidate for WLEDs.
Qi WangSirous Khabbaz AbkenarMatilde CirignanoHailong YuWenzhi WuGiorgio Divitini
关键词:PHOTOLUMINESCENCE
光致发光气凝胶研究进展
2024年
光致发光气凝胶结合了气凝胶和发光材料的特性,是一类新型发光多孔材料。它具有比表面积大、孔隙度高、结构灵活、光学性质可控等特点,在传感、光电器件等领域有广泛的应用前景。本综述聚焦光致发光气凝胶,总结了该气凝胶的制备方法,根据发光中心的分类对该气凝胶进行系统介绍,探讨了该气凝胶在传感、光电器件等领域的应用,最后对该气凝胶面临的挑战及未来的研究趋势进行了展望。
陈秀梅李惺宇袁泽谢小吉
关键词:光致发光气凝胶稀土纳米晶
和光溢彩——铜纳米簇的光致发光现象
2024年
本实验自制谷胱甘肽与半胱氨酸分别配位的铜纳米簇(CuNCs),根据CuNCs光致发光原理,设计实验探究配体、氧化剂、pH、溶剂及温度对CuNCs光致发光的影响,并开发出科普实验试剂盒。本试剂盒携带方便、操作简单、安全性高,适合多种科普场景,能够满足具有不同梯度科普需求的人群,增强公众对纳米材料的了解,让公众感受到化学之美。
陈夏雪杨羽萱杨若琳王一竹刘红云
关键词:光致发光
Er^(3+)掺杂无铅铁电陶瓷的电学和光致发光性能
2024年
无铅多功能铁电陶瓷在各类信息的检测、转换、存储及处理中具有广泛的应用,且稀土元素由于其特殊的电子结构和稳定的发光特性,有望赋予铁电陶瓷新的发光性能并改善其电学性能,为设计新型光电器件提供了可能。采用传统的高温固相反应法制备稀土Er^(3+)掺杂Ba_(0.85)Ca_(0.15)Ti_(0.90)Zr_(0.10)O_(3)(BCTZ)无铅多功能铁电陶瓷,系统研究Er^(3+)掺杂浓度对BCTZ铁电陶瓷微观结构、电学性能及光致发光的影响及内在联系。研究表明,陶瓷平均晶粒尺寸随Er^(3+)掺杂浓度的增加单调减小,由7.59μm减小至3.82μm,减小约49.67%;陶瓷可释放的能量密度(Wrec)和储能效率(η)可分别提高约29.81%和122.79%。Er^(3+)掺杂BCTZ陶瓷表现出强烈的绿光发射(548 nm)且发光强度相对可调性可达173.09%。Er^(3+)掺杂BCTZ陶瓷优异、特殊的电光性能,在电介质储能电容器和光学器件等领域具有潜在应用前景。
张怡笑王小丽杨健关朋飞郑明
关键词:稀土掺杂铁电光致发光
光刺激响应型聚集诱导发光材料的研究进展
2024年
光作为一种清洁且安全可控的刺激响应信号,具有非接触性、灵敏度高及可远程精准操控等优点.近年来,具有光刺激响应性质的聚集诱导发光(AIE)材料取得了飞速的发展,其发光性质可以通过光刺激来精确调控,在生物成像、防伪、光图案化和光学传感等领域展现出了极大的应用前景.为了促进人们对光刺激响应型AIE材料的理解,并推动相关领域的发展,同时也因为缺少其在内在机理方面的系统性综述,在此,系统总结了近些年来光刺激响应型AIE材料的研究进展.依据光刺激响应的内在机理(光化学和光物理),介绍了近些年来光刺激响应型AIE材料的设计、性质调控以及应用实例,并对该领域存在的挑战和未来发展方向进行了展望,期望能对该领域未来的发展提供有益的指导.
唐子然孙浩朱亮亮
关键词:聚集诱导发光光化学光物理激发态

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