查询词典 luminescence

The system may acts as a constant temperature controller in order to study the relations between luminescence characteristic and temperature.

该系统除可作一般的恒稳控制以研究样品的发光性能对温度的依赖关系，也可在0℃～160℃范围内给出不同的升温速率以研究不同升温速率下样品的陷阱深度及分布情况。

The bay area has no substituent and has electron-withdrawing groups,such as bromine atom,cyano-group and 4-formyl phenoxy group compounds have strong absorption in 525 nm,when excitated them,they have strong yellow and salmon pink luminescence bettwen 538 and 566 nm.When introduce electron-donating substituents,such as phenoxy group,morpholinyl,piperidinyl and n-butylamino group,the absorption bathochromic shift while the electron-donating ability is improved,bettwen 536 and 692 nm have strong absorption,reach to the near-infrared region. When excitated them,only the phenoxy group compound has strong salmon pink luminescence in 572 nm,the others have no fluorescence.

其中，港湾位无取代的以及含吸电基团(—Br、—CN、对甲酰基苯氧基)化合物在525 nm左右处均有很强的吸收ε＞10~4M~(-1cm~(-1)，当光激发时，港湾位无取代、溴代和氰基取代物发出538～547 nm的强烈黄色荧光，对甲酰基苯氧基取代物则发出566 nm的强烈橙红色荧光；含供电基团(苯氧基、吗啉基、哌啶基、正丁氨基)化合物随着供电子能力的增强，吸收发生红移，在536～692 nm处均有很强的吸收ε＞10~4M~(-1cm~(-1)，达到了近红外区，当光激发时，只有苯氧基取代物发出572 nm的强烈橙红色荧光，而含氮供电基取代物均发生了荧光淬灭。

The effects of Yb2O3 concentration on upconversion luminescence spectra of Tm3+/Yb3+-codoped oxyhalide tellurite glasses were studied, and upconversion luminescence mechanism of Yb3+ sensitize Tm3+ in oxyhalide tellurite glasses was analyzed.

研究了Yb2O3浓度对Tm3+/Yb3+共掺氧卤碲酸盐玻璃的上转换发光的影响，分析了上转换发光机理。

The upconversion luminescence spectra of Tm~ 3+/Yb~ 3+-codoped oxyhalide tellurite glasses have been investigated, and the action mechanisms of Tm_2O_3 content on upconversion luminescence of Tm~ 3+/Yb~ 3+-codoped oxyhalide tellurite glasses were analyzed.

研究了Tm3+/Yb3+共掺氧卤碲酸盐玻璃的上转换发光光谱，分析了Tm2O3含量对Tm3+/Yb3+共掺氧卤碲酸盐玻璃上转换发光的影响机理。

The thermal stability, Raman spectra, and upconversion luminescence spectra of lead halide-modified Tm~3+/Yb~3+-codoped tellurite glasses have been investigated, and the upconversion luminescence mechanism of Tm~3+/Yb~3+-codoped oxyhalide tellurite glasses were analyzed.

研究了卤化铅调整Tm3+/Yb3+共掺碲酸盐玻璃的热稳定性能、Raman光谱和上转换发光光谱，分析了Tm3+/Yb3+共掺氧卤碲酸盐玻璃的上转换发光机理。结果发现：混合卤化铅调整Tm3+/Yb3+共掺碲酸盐玻璃具有好的热稳定性能、低的声子能量、强的上转换蓝光。这表明混合卤化铅调整Tm3+/Yb3+共掺碲酸盐玻璃是一种上转换蓝光激光器的潜在基质材料

We found out one kind of new orange-red long afterglow material La2O2S: Eu3+, Mg, Zr.2 In the phosphor Gd2O2S, Mg, Ti which was prepared by high-temperature solid-state method, the orange afterglow phenomenon can be seen after illuminated with UV light.3 Using the high-temperature solid-state method, Gadolinium oxysulfide phosphors doped with rare earth ions were synthesized. We can observe the red or orange phosphorescence in Gd2O2S doped with Eu3+, Sm3+, Tm3+, Yb3+, Dy3+, Er3+, Nd3+or Ho3+. This is a new result of the long afterglow phosphors research.4 Using the microwave radiation method, the new Sm3+ doped gadolinium oxysulfide phosphor, which has the orange-red long afterglow emission after illuminated with UV light or visible light, was synthesized for the first time.5 In fluorescent materials YOX doped with europium ions, the long afterglow phenomenon wasnt observed but the blue luminescence of Eu2+ and red luminescence of Eu3+ are simultaneously examined. This is a new result of the valence stability and change of Eu2+ in yttrium oxyhalide .We systematically studied the effects of the host, addition agents and reaction atmosphere on the valence change and fluorescence property of europium ions.

经过系统的研究总结得到以下的结论与成果： 1采用高温固相反应法合成了一系列稀土离子掺杂的硫氧化镧发光粉，发现了该体系中Eu~(3+)的长余辉发光，从而得到一种迄今未见文献报道的红色长余辉发光材料：La_2O_2S：Eu~(3+)，Mg，Zr； 2在Gd_2O_2S，Mg，Ti磷光粉中观察到橙色的长余辉发光现象； 3采用高温固相反应法合成了一系列稀土离子掺杂的硫氧化钆磷光粉，在掺杂Eu~(3+)、Sm~(3+)、Tm~(3+)、Yb~(3+)、Dy~(3+)、Er~(3+)、Nd~(3+)、Ho~(3+)的Gd_2O_2S中观察到红色和橙色长余辉发光； 4首次采用微波法合成了Gd_2O_2S：Sm~(3+)，Mg，Ti磷光粉，该磷光粉经紫外或可见光激发后呈现明显的橙红色长余辉发光； 5在YOX中同时观察到Eu~(2+)和Eu~(3+)的发射，系统研究了基质、添加剂及反应气氛对Eu价态和发光的影响。

The thermoluminescent dosimeters are widely used for measuring the radiation dose. However, the luminescence centers of thermoluminescent dosimeter are disappeared by reading process, and then repetition of measurement is impossible. Radiophotoluminescent glass dosimeters can be repeatedly read and keep the luminescence centers for a long time. The aims of this study are to develop and characterize the radiophotoluminescent glass dosimeter and measure the clinical radiation dose using Dose Ace system.

热发光剂量计广泛应用於辐射剂量的测量，其缺点为在计读过程中，发光讯号会消失不见，无法重复测读，而玻璃剂量计发光讯号不会因计读过程消失，可重复测读；本研究目的为进行试制玻璃剂量计，分析所试制玻璃剂量计的各项特性，亦使用商业化Dose Ace系统量测临床辐射剂量。

The products were identified by IR,NMR,MS and elemental analysis. In our method,K.OH was used in place of NaOH to synthesize benzyl ester of 3,5-dimethyl-4-hydroxybenzoic acid,2',6'-dimethyl-4'-(n-succinimidyloxycarbonyl) phenyl-acridinium-9-carboxylate was purified on a silica gel column with chloroform/ethylacetate(4:l,v/v) as eluent and further purified by triturating with hexane/acetone(2:l,v/v).The luminescence produced by DMAE-NHS is a flash light with maximumemission at 0.4s and decay half-time of 0.9s. The luminescence intensity is 6.11x10 cps/mol,which is affected by the composition of trigger and surfactant.

DMAE·NHS的合成是本论文的关键和难点，我们对文献方法进行改进：文献方法用氢氧化钠与3，5-二甲基-4-羟基苯甲酸反应制得3，5-甲基-4-羟基苯甲酸钠，再用3，5-二甲基-4-羟基苯甲酸钠与苄氯作用制备3，5-二甲基-4-羟基苯甲酸苄酯，我们用氢氧化钾代替氢氧化钠，使合成取得成功；在合成2'，6'-二甲基-4'-苯基-吖啶-9-甲酸酯时，文献方法对粗产品进行两次硅胶柱层析纯化，第一次柱层析用氯仿/乙酸乙酯(4：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，第二次柱层析用己烷/丙酮(2：1，Ⅴ：Ⅴ)作溶剂和淋洗剂，按照文献方法得到的不是所需要的化合物，我们只进行第一次柱层析纯化，然后用己烷/丙酮(2：1，Ⅴ：Ⅴ)进行研磨，过滤，洗涤，除去溶于己烷/丙酮(2：1，Ⅴ：Ⅴ)的部分，得到所需要的产品。

The silicate is more stable than the aluminate. and have better adaptable, but its luminescence properties do not achieve aluminates\ There a lot of work must be done for improving the luminescence properties of silicate.

而硅酸盐体系化学性质较铝酸盐体系稳定，具有更好的适应性，但硅酸盐体系的发光性能尚未达到铝酸盐体系水平，进一步提高硅酸盐体系的发光性能，还需做更深入的工作。

Guanine can quench the phthalhydrazidylazoacetylacetone's ECL in acid medium, and the linear concentration range of guanine relative to the ECL intensity is from 2.0×10~(-6) to 1.0×10~(-5) mol/L.The mechanism of phthalhydrazidylazoacetylacetone's ECL on the surface of ITO glass has been discussed according the experimental phenomenon.The phenomenon of ITO self-luminescence has also been studied.It has been found that the machanism of phthalhydrazidylazoacetylacetone on the surface of ITO in different medium is dissimilarity. The phenomenon of ITO self-luminescence may be caused by the interaction of the active oxygen element and ITO's surface.

鸟嘌呤在弱酸性介质中3-(1-乙酰丙酮偶氮)苯二甲酰肼的电化学发光具有显著的淬灭作用，2.0×10~(-6)～1.0×10~(-5) mol/L浓度范围内，电化学发光强度与鸟嘌呤的浓度成良好的线性关系根据相关试验现象对3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上的电化学发光机理进行了初步探讨，并对氧化铟锡玻璃电极自身发光现象进行了研究，研究发现在不同酸度环境中，3-(1-乙酰丙酮偶氮)苯二甲酰肼在氧化铟锡玻璃电极上电化学发光的机理是显著不同的；ITO自身发光可能是由活性氧系分子与ITO镀膜玻璃电极表面相作用引起的。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。