Ho3+:ZnWO4的光谱和上转换发光

用提拉法生长出光学质量的Ho3+ZnWO4单晶,研究了晶体在可见和近红外区的吸收光谱和发射光谱,分析了Ho3+离子在钨酸锌晶体结构中能级位置和晶体场能级分裂.研究表明在波长488 nm激光激发时,550,665 nm和758 nm 3个波段有较强荧光,荧光分支比分别为84.18%,0.68%,15.14%,对应于5S2→5I8,5F5→5I8和5S2→5I7跃迁.在633 nm激光激发时观测到了来自5S2→5I8跃迁的540～556 nm宽带上转换荧光,上转换过程主要是单离子步进吸收.     

用于染料敏化太阳能电池的苊并吡嗪类染料的设计与合成，

以吡嗪环作为吸电子基团,单羧基为连接基团,选用不同的芳环供电基团设计合成了3个苊并吡嗪类染料敏化太阳能电池(DSSC)染料。其中,以二苯胺为供电基的染料Va性能最好,主要吸光范围是400~500 nm,ELUMO为-1.10 eV,远负于TiO2的导带能级-0.5 eV,说明染料的激发态电子注入到纳米TiO2的导带在热力学上是可行的;EHOMO为1.31 eV,远正于I-/I3-的氧化还原电位0.4 eV,说明处于氧化态的染料分子从氧化还原电对得到电子再生。光电转换效率最高为3.06%,达到经典染料N719效率的43%。     

Ho~(3+)∶ZnWO_4的光谱和上转换发光

用提拉法生长出光学质量的Ho3+∶ZnWO4单晶,研究了晶体在可见和近红外区的吸收光谱和发射光谱,分析了Ho3+离子在钨酸锌晶体结构中能级位置和晶体场能级分裂。研究表明:在波长488nm激光激发时,550,665nm和758nm3个波段有较强荧光,荧光分支比分别为84.18%,0.68%,15.14%,对应于5S2→5I8,5F5→5I8和5S2→5I7跃迁。在633nm激光激发时观测到了来自5S2→5I8跃迁的540～556nm宽带上转换荧光,上转换过程主要是单离子步进吸收。     

(Ca,Fe)共掺铈酸镧陶瓷的近红外吸收性能

以氧化镧、氧化铈、氧化钙、氧化铁为原料,采用高温固相烧结工艺制备(Ca,Fe)共掺的系列铈酸镧红外吸收陶瓷(La2–xCaxCe2–yFeyO7)。结果表明:所有样品的晶相均为萤石结构;(Ca,Fe)共掺后引入了杂质能级,强化了自由载流子吸收,进而实现了样品近红外波段(750~2 500 nm)性能由高红外反射向高红外吸收的转变。当Ca引入量x为0.1、Fe引入量y为0.15时,样品近红外吸收性能较优,在750~2 500 nm波段的平均吸收率为88.7%,较未掺杂样品同波段的平均吸收率(4.9%)提高了17倍。     

Ho^3＋：ZnW04的光谱和上转换发光

用提拉法生长出光学质量的Ho^3 ：ZnWO4单晶，研究了晶体在可见和近红外区的吸收光谱和发射光谱，分析了Ho^3 离子在钨酸锌晶体结构中能级位置和晶体场能级分裂。研究表明：在波长488nm激光激发时，550，665nm和758nm3个波段有较强荧光，荧光分支比分别为84．18％，0．68％，15．14％，对应于^5S2→^5I8，^5Fs→^5I8和^5S2→^5I7跃迁。在633nm激光激发时观测到了来自^5S2→^5I8跃迁的540～556nm宽带上转换荧光，上转换过程主要是单离子步进吸收。     

循环伏安法沉积Bi-Te合金及其光学性能的研究

采用循环伏安法成功在Ti膜上沉积得到了可见光到近红外波段低反射率的Bi-Te合金镀层,并研究了镀层的结构、形貌和光学性质。X射线衍射分析结果表明沉积得到的镀层是以Bi2Te3为主的多晶结构;扫描电子显微镜分析显示利用循环伏安法可以得到类似"黑硅"的有序粗糙表面;紫外可见近红外分光光度计对其光学性能的测试表明该镀层在300～1 700 nm整个波段的反射率在5%以内。     

不对称8—氧基喹啉酞菁的合成及性质

以4--硝基邻苯二甲腈、亚氨基二乙酸、8-羟基喹啉等化合物为原料,合成了一种不对称羧基锌酞菁,2-(8-氧基喹啉)-9.16.23-(N.N-二乙酸胺基)酞菁锌。通过红外光谱、紫外-可见光谱、核磁共振氢谱对其进行结构表征.Q带吸收波长为680 nm,B带为358nm。利用循环伏安法和差分脉冲伏安法,结合紫外-可见吸收光谱,得到其基态氧化电位(0.93V)和激发态氧化电位(-0.89V)能级位置与纳米TiO2导带能级相匹配,可用于制备染料敏化太阳能电池。     

紫甘蓝天然染料敏化三氧化二铋太阳能电池研究

对紫甘蓝天然染料敏化Bi2O3太阳能电池进行了研究。考察了Bi2O3薄膜的制备温度、染料吸附对Bi2O3太阳能电池性能的影响。结果表明,紫甘蓝天然染料作为敏化剂明显改善Bi2O3太阳能电池的光电性能。Bi2O3薄膜在500℃煅烧4h,在染料中吸附12h的太阳能电池的开路电压为0.250V,短路电流为0.063mA·cm-2。     

不对称8-氧基喹啉酞菁的合成及性质

以4-硝基邻苯二甲腈、亚氨基二乙酸、8-羟基喹啉等化合物为原料,合成了一种不对称羧基锌酞菁,2-(8-氧基喹啉)-9,16,23-(N,N-二乙酸胺基)酞箐锌。通过红外光谱、紫外-可见光谱、核磁共振氢谱对其进行结构表征,Q带吸收波长为680 nm,B带为358nm。利用循环伏安法和差分脉冲伏安法,结合紫外-可见吸收光谱,得到其基态氧化电位(0.93 V)和激发态氧化电位(-0.89V)能级位置与纳米TiO2导带能级相匹配,可用于制备染料敏化太阳能电池。     

V掺杂TiO_2的制备及其可见光催化性能研究

本文采用水热法制备V掺杂TiO2(V-TiO2)光催化剂,借助XRD、XPS、UV-Vis DRS等手段对V-TiO2的结构进行表征,并以酸性红染料作为模型污染物,评价V-TiO2在可见光作用下的光催化性能。实验结果表明,V离子进入TiO2晶格并取代Ti4+离子,V离子掺杂在TiO2的导带下方引入了V3d掺杂能级,V-TiO2在可见光区具有显著吸收,且光生载流子的复合受到有效抑制,因此,V掺杂明显提高了TiO2降解酸性红染料的效率。     

Polymethinfarbstoffe mit Lichtabsorption im Nahen Infrarot

Polymethine Dyes with Light Absorption in the Near Infrared . There is a currently significant interest in days that absorb in the near infrared (NIR) region, These compounds are mainly used as laser days and photoreceptors of photodiode lasers. Many NIR dyes are of polymethinic structure such as polymethine cyanines and polymethine violenes. Knowledge about structure-color relationships enables dyes of appropriate absorption features to be predicted.     

生物分析用近红外荧光染料研究进展

概述了用于生物分析领域与生物分子共价结合的近红外荧光染料,包括菁染料(含多次甲基菁、方酸菁和克酮酸染料)、酞菁、罗丹明及荧光素等,对其结构、光谱性能、应用等方面进行了综述,对发展前景进行了预测。     

Camouflage of cotton fabrics in visible and NIR region using three selected vat dyes

To provide camouflage in near infrared (NIR) region and imitate reflectance profile of greenish leaves, cotton fabrics were dyed with three selected vat dyes, namely C.I. Vat Blue 6, C.I. Vat Yellow 2, and C.I. Vat Red 13. Reflectance curves of two types of fresh greenish leaves were measured as standard reference. Transmittance curve of vat dyes in acetone solution indicated that selected vat dyes have suitable structure to provide camouflage in NIR region. According to reflectance profiles, reflectance curve of Vat Blue 6 has more similarity with that of green leaf at the concentration of 0.85% owf (on weight of fiber) and 1.2% owf in comparison with those of C.I. Vat Yellow 2 and C.I. Vat Red 13. Cotton fabrics were dyed with different mixtures of the dyes to obtain a standard shade to reach camouflage in visible range. Chromatic values of dyed fabrics were measured (CIE1976 L*, a*, and b*) and two standard shades of the 1948 US army pattern, NATO and forest green, were obtained on cotton fabrics with ΔE_CMC < 2. Reflectance profiles of these two shades were located between the reflectance of green leaves. So, two vat dyes were introduced to camouflage dyes group, C.I. Vat Blue 6 and C.I. Vat Red 13, and used to achieve NATO green and forest green shades for first time. All dyed samples showed good fastness properties. The effect of washing and light exposure on camouflage properties of fabrics in visible and NIR region was inconsiderable. © 2012 Wiley Periodicals, Inc. Col Res Appl, 39, 200–207, 2014     

双羟基七甲川菁染料的合成及其光谱性能研究

通过分子设计,分别以2,3,3-三甲基吲哚和1,1,2-三甲基-1H-苯并[e]吲哚为原料,首先合成两种季铵盐,再分别同2-氯-1-甲酰-3-羟基亚甲基环己烯缩合,利用Suzuki-Miyaura反应实现染料中位C—C偶联,以超过70%的收率制备了4种带有活性羟基的七甲川菁染料。利用核磁和高分辨率质谱对染料结构进行了表征。以乙醇为溶剂,用紫外-可见光谱仪考察了染料的光谱性能。采用电流为13.4 A的高压氙灯为光源,考察了染料的光稳定性。探究了pH对染料颜色的影响,并尝试推论变色机理。结果表明,4种七甲川菁染料均在近红外区产生较强吸收,在无水乙醇中均具有良好的光稳定性。不同pH下,染料的光谱性能研究发现,七甲川菁染料吸收光谱受pH影响较大,在pH=5～7时,染料在近红外区有最佳吸收。     

一系列硫代双烯镍近红外染料的合成及性能

该文分别通过安息香路线和二酮路线合成了4种具有不同取代基的硫代双烯镍近红外染料,并考察了染料的物理、光电化学及热稳定性等性质。紫外-可见-近红外(UV-Vis-NIR)吸收光谱测试结果表明,配合物在700～1 100 nm都具有较强的吸收。对化合物的取代基效应及溶剂效应的研究发现:供电子基团导致λmax红移,而吸电子基团导致λmax蓝移,且λmax随着溶剂极性增大而增大。利用循环伏安法和差分脉冲伏安法(CV/DPV)测试了化合物的电化学性质。此外,该文还通过密度泛函理论(DFT)对化合物的HOMO和LUMO能级进行了计算。热失重测试研究表明,合成的化合物具有较好的热稳定性。     

Near-infrared absorbing acidochromic nonsymmetric Trimethinium Dyes containing acridinium and pyrylium end groups

A series of new acidochromic dyes absorbing in the NIR spectral region (up to 900 nm) has been synthesized with a systematic variation of the underlying nonsymmetric pyrylium trimethinium acridine structure. The dyes exhibit pK_a-values between 5.7 and 6.7. Semiempirical MO-calculations were performed to elucidate the essentials of the chromophores.     

新型菲醌类染料的合成及性能

设计合成了以含有丙二腈基团的菲醌结构为电子受体、三苯胺或N,N-二(4-正丁基苯基)苯胺结构为电子给体的D-A-D型纯有机功能染料(Ⅳ和Ⅴ)。利用紫外-可见吸收光谱、荧光发射光谱、循环伏安曲线及理论计算对该类染料及其前体的光学、电化学性质进行了研究。结果表明,染料Ⅳ和Ⅴ在可见光区域均有较宽的吸收带和发射带,其最大吸收波长分别为581和605 nm,最大发射波长分别为442和472 nm;相对于HOMO能级,丙二腈基团的引入对LUMO能级的影响更大。     

Holographic polymer dispersed liquid crystal reflection gratings formed by visible light initiated thiol-ene photopolymerization

Visible laser light of wavelengths 442, 488 and 532 nm was used to write holographic reflection gratings with notches into the infra-red spectral region in polymer dispersed liquid crystals (H-PDLC). The gratings were formed by the spatially periodic phase separation of nematic liquid crystal during thiol-ene photopolymerization. An organic titanocene based complex, Rhodamine 6G (Rh6G) and Pyrromethene 597 (Pym) dyes in combination with benzoyl peroxide, were used as initiators. Using visible laser light and a single prism, electrically switchable reflection gratings with notches in the blue, green, yellow, red, and near infra-red (NIR) spectral regions were fabricated using angle tuning. The photophysics of the initiator dyes was studied by absorption and fluorescence spectroscopy. Morphology studies by TEM showed a periodic distribution of discrete nematic droplets of nearly spherical shape. The development of visible photoinitiator systems broadens the range of fabrication wavelengths of dynamic reflection filters using inexpensive visible lasers.     

利用Ca2+掺杂增强钙钛矿型LaFeO3的红外发射率

采用固相反应法,在空气气氛中制备了纯LaFeO3和Ca2+掺杂的LaFeO3,对其在近红外波段的发射率进行了研究和比较. 结果表明,掺杂10mol% Ca2+的La0.9Ca0.1FeO3在3?5 ?m波段的红外发射率达0.92,比纯LaFeO3提高了119%. 原因为Ca2+掺杂进入LaFeO3的晶格后,在其半导体带隙中引入Fe4+杂质能级,形成了跃迁激活能仅需0.1 eV的Fe3+?Fe4+小极化子吸收带,增强了LaFeO3的红外辐射性能.     

苯骈噻吩酮衍生物甲川型分散染料的研究(Ⅰ)染料分子结构与吸收光谱

本文测定了一系列苯骈噻吩酮衍生物甲川型分散染料在溶液中的吸收光谱,研究了这类染料的分子结构与吸收光谱之间的关系.