Author Keywords: Radiation detection; Long-lasting phosphor; Luminescence; Temperature dependence; Fade-out effect 相似文献
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Munehiko Kowatari Daisuke Koyama Yoshiyuki Satoh Kouichi Iinuma Shunsuke Uchida 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2002,480(2-3):431-439
The temperature dependence of luminescence from a long-lasting phosphor (LLP), SrAl2O4 : Eu2+,Dy3+, exposed to ionizing radiation has been measured to understand the LLP luminescence mechanism. Evaluation of the decay constants of the LLP exposed to -, β- or γ-rays at temperatures from 200 to 390 K showed that the decay constant is divided into four components ranging from 10−4 to 10−1 s−1 with activation energies of 0.02–0.35 eV.
Total luminous intensity from the LLP with changing irradiation temperature has its maximum value around the room temperature. Irradiation at elevated temperature (390 K) has the total luminescence pattern with monotonous decrease as temperature rises. As a result of evaluating the temperature dependence of luminescence, the luminescence mechanism is considered as follows:
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D. Bogdal V. Yashchuk J. Pielichowski T. Ogul'Chansky M. Warzala V. Kudrya 《应用聚合物科学杂志》2002,84(9):1650-1656
The alkyl methacrylates with halogenated carbazolyl pendant groups were prepared, and the analysis of their absorption and emission spectra showed that the polymers containing monohalogenatged carbazole rings were capable of exhibiting a high singlet‐triplet (S‐T) conversion. The reasons that mainly triplet excitons could be observed in such polymers and additional bands appearance in the spectra of the polymers with dihalogenated carbazole rings are discussed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1650–1656, 2002; DOI 10.1002/app.10469 相似文献
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介绍了环糊精和表面活性剂作为有序介质在室温磷光中的研究进展.并对各种方法的特点和应用情况作了简要概括。认为环糊精和表面活性剂混合介质能大大提高发光物质的室温磷光.而且操作简便.应用前景广阔。 相似文献
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采用高温固相反应法,分别以高纯氧化铝、自制纯净铝酸钠溶液及精制工业铝酸钠溶液为原料合成了黄绿色SrAl2O4:Eu^2+Dy^3+磷光粉,通过测量其激发光谱、发射光谱及余辉时间,考察了不同铝基原料对磷光材料发光性能的影响.结果表明,所制备的3种磷光粉的激发光谱和发射光谱的波长基本一致,激发光谱位于300-450nm之间,主发射波长在510nm左右.用工业铝酸钠溶液制备出的长余辉材料的发射强度不低于用另外两种原料制备的长余辉材料,余辉时间比用另外两种原料制备的长余辉材料稍长,效果较好,采用工业铝酸钠溶液制备铝酸盐基长余辉材料,可以降低能耗、节约成本. 相似文献
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Circularly polarized luminescence (CPL) materials have received increasing attention in recent years. Amongst various CPL materials, circularly polarized phosphorescence (CPP) materials featuring long life-time represent a novel research frontier and exhibit promising applications in various fields. Herein, the state-of-the-art advances of CPP materials are systematically summarized, as classified into transition metal complexes, organic small molecules, polymers, and organic/inorganic hybrid materials. Besides, the recent applications of CPP materials in organic light-emitting diodes and encryption display are also summarized. Furthermore, the current challenges and future perspectives are put forward. It is expected that this review will offer more inspirations for the future rational design of advanced CPP materials, thus further promoting their future practical applications. 相似文献
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稀土离子掺杂对长余辉发光玻璃发光性能的影响 总被引:2,自引:0,他引:2
选择制备了系列Eu^2+,Dy^3+共掺杂的硼铝酸锶长余辉发光玻璃。利用发光光谱、余辉衰减曲线、热释光谱系统研究了稀土离子掺杂对长余辉玻璃发光性能的影响。研究结果表明,不同掺量组合的Eu^2+及Dy^3+对长余辉玻璃发光性能有不同影响,在Eu^2+及Dy^3+掺量比为l:l(摩尔比)的情形下,随Eu^2+离子掺量的增多,发光性能下降;在Eu^2+及Dy^3+掺量比为1:2的情形下,随Eu^2+离子掺量的增多,发光性能增强。在此实验基础上,围绕缺陷形态及其与稀土离子间的能量传递,提出了可能的长余辉机制。 相似文献
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A new kind of doped rare earth free phosphor Y2O2S∶xTi(0<x≤0.10) with doped Ti as activative center was synthesized by solid state reaction and sintered at 1200 ℃ for 2.5 h under reducing atmosphere. XRD patterns, photoluminescence spectra, time-resolved phosphorescence spectra and decay curves of the phosphor were investigated. XRD results reveal that a single Y2O2S phase exists with Ti content up to 6%(mol fraction). Yellow long lasting phosphorescence for present materials was observed in the dark with naked eye after the removal of the excitation light. From the time-resolved phosphorescence spectra the broad emission band centered at 565 nm was confirmed to be responsible for the long lasting phosphorescence which could maintain above 1 h. The possible mechanism responsible for the long lasting phosphorescence of the Y2O2S∶Ti phosphor was proposed. 相似文献
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Luminescence and defect properties of novel phosphor β-Zn3(PO4)2:Zr4 were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm-1. The unusual optical properties of Zr4 ion are ascribed to its uncommon coordination environment. In addition it shows intensive bluish-green long lasting phosphorescence(LLP) due to the existence of electron trap, which is generated by aliovalent substitution of Zr4 ion for the cation site in the matrix as shown in thermoluminescence(TL) spectrum. 相似文献