SrAl2O4：Eu^2＋,Dy^3＋荧光材料的发光性质

我们在本文中制作了五种不同ＳｒＡｌ２Ｏ４：Ｅｕ＾２＋和Ｄｙ＾３＋的样品。样品分别是ＳｒＡｌ２Ｏ４基质的α相和β相的粉末和片状样品,以及单晶样品。我们对所有样品进行了形貌的ＳＥＭ研究。我们还对α相和β相粉末样品及片状样品以及α相单晶样品的荧光发射谱进行了测量。它们的荧光发射的中心波长为５２０ｎｍ,对应于ＳｒＡｌ２Ｏ４基质中的Ｅｕ＾２＋的４ｆ＾６５ｄ＾１的＾２ｅｇ激发态到４ｆ＾７的＾８Ｓ７／２的跃迁发     

A3M2GeO12石榴石体系中Cr^3＋离子的宽带发射光谱

首次报道在Ａ３Ｍ２Ｇｅ３Ｏ１２：Ｃｒ（Ａ＝Ｃｄ＾２＋,Ｍ＝Ａｌ＾３＋,Ｇａ＾３＋,Ｓｃ＾３＋）锗酸盐石榴石体系中,Ｃｒ＾３＋离子室温下的红－近红外宽发射带光谱性质。随位于八面体格位上的Ａｌ＾３＋→Ｇａ＾３＋→Ｓｃ＾３＋和十二面体格位上的Ｃｄ＾２＋→Ｃａ＾２＋组成顺序变化,室温下,Ｃｒ＾３＋离子的＾４Ｔ２→＾４Ａ２能级跃迁的Ｒ－ＮＩＲ宽发射带,发射峰及光谱的长波和短波边逐渐向低能长波边移动。     

Eu^2＋：Sr9Ca（PO4）6Cl2中的新型色心及其光激励发光

本文报道了Ｅｕ＾２＋：Ｓｒ９Ｃａ（ＰＯ４）６Ｃｌ２的新型色心。它的吸收带主峰分别位于７０８，７８５，８４５及９９０ｎｍ。用对应于Ｆ心吸收带和这些吸收带波长的光束分别激励样品时得到相同的光激励发光。通过对比研究表明，这些吸收带是由Ｆ心的缔合中心，即由ＦＡ心产生的。由于这些色心的吸收带偏离Ｅｕ＾２＋的发射波长（４５０ｎｍ）更远，故更适应于Ｅｕ＾２＋：Ｓｒ９Ｃａ（ＰＯ４）６Ｃｌ２光波励发光的研究和开发。     

杂质对（Ce,Gd,Tb）MgB5O10灯用荧光粉发光量子效率的影响

研究了杂质对Ｃｅ０．１ｇＤ０．６ｔＢ０．２ｍＧｂ５ｏ１０发光量子效率的影响。低浓度的Ｐｒ＾３＋、Ｎｄ＾３＋、ＤＦ＾３＋、Ｈｏ＾３＋和Ｅｒ＾３＋不能有效地与Ｇｄ＾３＋和Ｔｂ＾３＋竞争Ｃｅ＾３＋离子的激发能。此外，因电子传递过程，Ｓｍ＾３＋和Ｅｕ３＋使Ｃｅ＾３＋的发光效率大大降低。     

A3M2Ge3O12石榴石体系中Cr3+离子的宽带发射光谱

首次报告在Ａ３Ｍ２Ｇｅ３Ｏ１２∶Ｃｒ（Ａ＝Ｃｄ２＋,Ｃａ２＋;Ｍ＝Ａｌ３＋,Ｇａ３＋,Ｓｃ３＋）锗酸盐石榴石体系中,Ｃｒ３＋离子室温下的红—近红外（Ｒ—ＮＩＲ）宽发射带光谱性质。随位于八面体格位上的Ａｌ３＋→Ｇａ３＋→Ｓｃ３＋和十二面体格位上的Ｃｄ２＋→Ｃａ２＋组成顺序变化,室温下,Ｃｒ３＋离子的４Ｔ２→４Ａ２能级跃迁的Ｒ－ＮＩＲ宽发射带,发射峰及光谱的长波和短波边逐渐向低能长波边移动。这是由于晶场强度减弱,阳离子的离子半径增大的结果。在镉（钙）铝和镉（钙）镓锗酸盐体系中,少量Ｓｃ３＋取代八面体上的Ａｌ３＋和Ｇａ３＋时,可使Ｃｒ３＋的Ｒ－ＮＩＲ荧光发射强度增强。     

Al2O3加掺杂Cr^3＋,Cr^4＋离子EPF零场分裂的理论解释

在晶体场理论基础上，研究了刚玉Ａｌ２Ｏ３中分别掺杂Ｃｒ＾３＋和Ｃｒ＾４＋的ｄ－ｄ电子光谱和ＥＰＲ零场分裂Ｄ，理论计算同实验值符合好，研究表明，掺杂晶体Ａｌ２Ｏ３：Ｃｒ＾４＋中络离子（ＣｒＯ６）＾８－局城结构应在压缩的三角畸变（△θ≈３°）这是零场分裂Ｄ反常大（≈７ｃｍ＾－１）的重要原因。     

新型（Pb,Cd）—1222相化合物的制备,结构和电学性质

本成功地合成了一系列新型Ｐｂ－１２２２相层状铜氧化物（Ｐｂ０．５Ｃｄ０．５）（Ｓｒ０．９Ｒ０．１）２（Ｒ‘０．７Ｃｅ０．３）２Ｃｕ２Ｏｚ，Ｒ＝Ｒ’＝Ｙ，Ｐｒ，Ｓｍ，Ｅｕ，Ｇｄ，Ｄｙ，Ｈｏ以有（Ｒ，Ｒ‘）＝（Ｌａ，Ｅｕ），Ｓｍ，Ｇｄ），（Ｓｍ，Ｅｕ），（Ｌａ，Ｇｄ），（Ｅｕ，Ｇｄ），（Ｎｄ，Ｄｙ），（Ｎｄ，Ｙ），（Ｎｄ，Ｅｒ）。     

Sol—Gel法和微波辐射法合成亚纳米级Zn2SiO4：Mn^2＋,Er^3＋高效绿色 …

用Ｓｏｌ－Ｇｅｌ法和微小法合成了亚纳米级Ｚｎ２ＳｉＯ４：Ｍｎ＾２＋,Ｅｒ＾３＋高效绿色荧光体,考究了Ｍｎ＾２＋单掺和Ｅｒ＾３＋敏化的荧光体的发光,探讨了掺杂浓度对发光性质的影响,发交Ｅｒ＾３＋可有效敏化Ｍｎ＾２＋的发光。ＳＥＭ表明Ｚｎ２ＳｉＯ４：Ｍｎ＾２＋,Ｅｒ＾３＋的粒度约为１５０～３５０ｎｍ。     

Ba,Sr,Ca在Co／γ—Al2O3催化剂上CO氧化的作用机制（II）

用硝酸盐水溶液等量共浸法制备了分别在７５０℃和９００℃焙烧的系列催化剂Ｃｏ－Ｍ／γ－Ａｌ２Ｏ３（Ｍ＝Ｃａ，Ｓｒ，Ｂａ，Ｃｏ３Ｏ４／Ａｌ２Ｏ３＝８ｗｔ％，Ｍ／Ｃｏ＝１５ｍｏｌ％）测定了ＣＯ氧化转化率，用ＢＥＴ表面，ＸＲＤ，ＸＰＳ，ＤＴＡ和ＴＰＲ等手段研究了助剂Ｂａ，Ｓｒ，Ｃａ的作用，结果表明，加入助剂后，ＣＯ完全转化温度下降了２０～６０℃左右，助剂的作用顺序为Ｃａ＞Ｓｒ＞Ｂａ，实验表明，７５０℃和９     

Ce3+,Tb3+氟化物磷光体的发光性质比较

采用溶液反应和固相反应分别合成了Ｋ３ＡｌＦ６基质化合物及ＫＢＦ４：Ｃｅ,Ｔｂ和Ｋ３ＡｌＦ６：Ｃｅ,Ｔｂ等磷光体,研究了它们的光谱特性,并与ＫＡｌＦ４：Ｃｅ,Ｔｂ、ＣａＦ２：Ｔｂ和ＡｌＦ３：Ｃｅ,Ｔｂ等磷光体的发光特性进行了比较。结果发现,ＣａＦ２：Ｃｅ,Ｔｂ、ＡｌＦ３：Ｃｅ,Ｔｂ、ＫＢＦ４：Ｃｅ,Ｔｂ和Ｋ３ＡｌＦ６：Ｃｅ,Ｔｂ等磷光体中Ｃｅ＾３＋对Ｔｂ＾３＋的能量传递不能有效进行,有时Ｔｂ＾３＋起     

Identification of the SO2 cold vibronic bands in the 32 200–33 300 cm−1 region

Summary The fluorescence excitation spectrum of SO₂ in the 32 200–33 300 cm⁻¹ energy region was recorded, at very low rotational temperature, in a pulsed supersonic jet. The band centres and relative intensities of about 60 well-resolved vibronic bands were determined in this region, which extends the previously available data by 800 cm⁻¹. Single vibronic level fluorescence spectra of two neighbouring vibronic bands in theD-band region along with a few filtered excitation spectra are also presented as an example of the resolution for the listed bands. The authors of this paper have agreed to not receive the proofs for correction.     

Sr3SiO5∶Eu^2＋和Sr3SiO5∶Eu^2＋,Dy^3＋荧光粉的黄色长余辉性质

用高温固相法制备了Sr3SiO5∶Eu2 和Sr3SiO5∶Eu2 ,Dy3 荧光粉。在紫外光辐照后,Sr3SiO5∶Eu2 和Sr3SiO5∶Eu2 ,Dy3 荧光粉具有明亮的黄色长余辉,源于Eu2 的4f65d-4f7的跃迁。紫外光激发停止后,Sr3SiO5∶Eu2 的余辉时间是4 h以上。余辉衰减曲线和热释光曲线说明了引入Dy3 离子可以产生大量的深陷阱和浅陷阱。产生的深陷阱使余辉时间延长到6 h以上。由热释发光曲线,根据热释光的通用级公式拟合了陷阱深度。Sr3SiO5∶Eu2 和Sr3SiO5∶Eu2 ,Dy3 荧光粉是有应用前景的黄色长余辉材料。     

Sr3SiO5:Eu2+和Sr3SiO5:Eu2+, Dy3+荧光粉的黄色长余辉性质

用高温固相法制备了Sr3SiO5:Eu2 和Sr3SiO5:Eu2 , Dy3 荧光粉.在紫外光辐照后, Sr3SiO5:Eu2 和Sr3SiO5:Eu2 , Dy3 荧光粉具有明亮的黄色长余辉,源于Eu2 的4f65d - 4f7的跃迁.紫外光激发停止后,Sr3SiO5:Eu2 的余辉时间是4 h以上.余辉衰减曲线和热释光曲线说明了引入Dy3 离子可以产生大量的深陷阱和浅陷阱.产生的深陷阱使余辉时间延长到6 h以上.由热释发光曲线,根据热释光的通用级公式拟合了陷阱深度.Sr3SiO5:Eu2 和Sr3SiO5:Eu2 , Dy3 荧光粉是有应用前景的黄色长余辉材料.     

Tryptophan and Proteins Can Be Entrapped in UV Transmitting Glass

It is demonstrated that tryptophan and proteins (parvalbumin and alcohol dehydrogenase) can be entrapped in silica glass. The silica glass is transparent in the UV spectral region, allowing for spectroscopic studies of immobilized proteins. The fluorescence spectra and phosphorescence spectra and lifetime of entrapped proteins resemble those observed for the molecules in aqueous solution.     

Blue long-lasting phosphorescence of Ti-doped BaZrO3 perovskites

Long-lasting phosphorescence was observed from Ti-doped BaZrO₃ perovskite synthesized by a solid-state reaction. The phosphorescence color is blue and the phosphorescence can still be seen with the naked eye in the dark for 30 min or more after stopping UV irradiation. By the measurements of electron spin resonance (ESR) spectra, it was confirmed that F⁺ center and Zr³⁺ exist in non-luminescent undoped BaZrO₃ and their concentrations decreased with the additive amount of TiO₂. It is expected that the luminescence center is F_A center composed of Ti³⁺ and F⁺ center.     

利用磷光敏化改善聚合物白光OLED性能

基于新型聚合物白光材料PF-DTFO制备了一种聚合物白光发光二极管(PWOLED),通过在聚合物发光层中掺杂蓝光磷光染料FIrpic,利用磷光敏化发光原理,改善器件电致发光性能。在敏化PWOLED中,掺杂的FIrpic染料作为给体将产生的三重态能量传递给白光聚合物的长波发射基团,进一步提高了长波基团的发光强度,改善了白光光谱,使基色更平衡并且光谱更稳定。驱动电压从8 V增加到16 V时,器件电致发光光谱基本不变,色坐标仅从(0.33,0.38)移动至(0.32,0.38)。敏化后的器件发光效率相对于未掺杂器件提高了38%。     

Characteristic features of carbazole phosphorescence quenching by benzophenone molecules in toluene at 77 K

We have studied the characteristic features of carbazole phosphorescence quenching by benzophenone in toluene at 77 K. We have shown that the decrease in the relative phosphorescence intensity for carbazole (energy donor) by a greater factor than we see for the relative change in its decay time is due to the fact that a change in the phosphorescence decay time occurs only for carbazole molecules participating in triplet-triplet energy transfer, while the substantial decrease in the phosphorescence intensity for carbazole with no change in the phosphorescence decay time is connected with quenching of its singlet states. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 4, pp. 554–556, July–August, 2006.     

一种基于蓝色荧光与磷光敏化技术的高显色指数白光有机电致发光器件的制备

通过采用4,4'-bis(9-ethyl-3-carbazovinylene)-1,1'-biphenyl (BCzVBi)为蓝色荧光发光单元,绿色磷光材料fac tris(2-phenylpyridine) iridium 敏化红色荧光材料4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB)为混合黄色发光单元,制备了一组白光有机电致发光器件。通过对染料掺杂浓度的优化,以及引入适当厚度的4,4-N,N-dicarbazole-biphenyl (CBP)作为中间层,获得了高效率、高显色指数的白光有机电致发光器件。器件在100 cd/m²亮度下的最高显色指数达到了90,此时的色坐标为(0.32,0.32), 非常接近白光等能点。该组器件的最大电流效率达到了11.00 cd/A,相应器件的最大亮度为13 330 cd/m²。     

Analytical Possibilities of the Fine-Structure Phosphorescence Spectrometry Technique for Registration of Polychlorinated Dioxins

The fine-structure phosphorescence spectra of 11 chlorinated dibenzo-p-dioxins were registered in hexane solutions at 77 and 4.2 K. Vibronic structure pecularities were revealed and the possibility of its analytical application was demonstrated. Evaluation of the detection limit for dioxin was performed for our spectral equipment.     

Luminescence of biologically active 24-epicastasterone and a model compound

Biologically active brassinosteroid 24-epicastasterone, ring B of which contains a C=O group and has the nπ*-configuration for a low-lying electronic excited state, exhibits rapid fluorescence. The wavelengths of the fluorescence maxima of the steroid dissolved in hexane and acetonitrile are equal to 332 and 394 nm, respectively. The fluorescence lifetime of the steroid dissolved in acetonitrile is τ = 9.9 nsec. Solutions of 24-epibrassinolide do not luminesce. The long-wavelength electronic absorption band λ_max^abs = 340 nm in the absorption spectrum of an ethanol solution of model compound 2, ring D of which contains a C=O group π*-conjugated with the C=C double bond of ring C, like in the spectrum of the steroid, has a low extinction coefficient. An ethanol solution of 2 does not fluoresce. 24-Epicastasterone at 77 K in ethanol solution exhibits phosphorescence with λ_max^phos = 447 nm. The phosphorescence decay is exponential with τ = 0.79 msec. Compound 2 also phosphoresces. The phosphorescence spectrum of its ethanol solution has a maximum at 490 nm. The phosphorescence decay is nonexponential in the early stage. The phosphorescence lifetime is 25 msec in the exponential decay region. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 2, pp. 182–186, March–April, 2008.