共查询到18条相似文献,搜索用时 218 毫秒
1.
2.
3.
4.
发光材料及陶瓷发光釉的研究综述 总被引:5,自引:0,他引:5
论述了长余辉发光材料分类及应用和陶瓷发光釉最新的研究进展。阐述了发光机理,并指出传统意义上长余辉材料存在明显的缺陷,认为稀土离子激活的铝酸盐、硅酸盐己经成为长余辉材料的主体,代表了长余辉材料研究开发的发展趋势。 相似文献
5.
稀土发光材料具有余辉时间长、发光强度高、化学稳定性好等优点,可配制环境友好型长余辉发光涂料。介绍了该发光材料的制备方法及其发光涂料的发光机理。讨论了影响发光涂料性能的因素及其发展趋势。 相似文献
6.
7.
8.
9.
10.
聚氨酯发光膜生产技术 总被引:1,自引:0,他引:1
介绍了以长余辉发光颜料、PU树脂为基料,采用涂布法制备发光膜的生产过程,同时阐述了发光材料的性能及聚氨酯发光膜生产过程中的影响因素。PU发光膜具有生产工艺灵活、发光亮度高、余辉时间长等特点,应用非常广泛。 相似文献
11.
12.
Orange- and Violet-Emitting Long-Lasting Phosphors 总被引:1,自引:0,他引:1
Jie Fu 《Journal of the American Ceramic Society》2002,85(1):255-257
Orange phosphorescence from Eu3+ -activated CaO and SrO and violet phosphorescence from Pb2+ -activated SrO were clearly observed after the materials had been excited with ultraviolet light. The orange phosphorescence resulted from 5 D 0 to 7 F 1 transitions of the Eu3+ ions and the violet from 3 P 0 to 1 S 0 transitions of the Pb2+ ions. The phosphorescence lasted >1 h. Trapped-electron centers and hole centers introduced into the CaO and SrO hosts by the ultraviolet light appear to have been responsible for generating the long-lasting phosphorescence. 相似文献
13.
纯有机室温磷光材料因其斯托克斯位移大、寿命长、毒性小、制备成本低等优势,在防伪、生物成像、有机发光二极管等方面有着广泛的应用前景,近年来受到了人们极大的关注.在磷光体系的构建上,不仅要引入溴、碘重原子或羰基等基团促进系间窜越过程,还要采用主-客体相互作用、聚合、掺杂、卤键、氢键、π-π堆积相互作用等方法为磷光体提供良好... 相似文献
14.
A red long-lasting phosphorescent material, monodisperse Y2O2S: Eu3+, Mg2+, Ti4+ nanospheres have been prepared successfully. Y(OH)(CO3): Eu3+ nanospheres were firstly synthesized via an urea-based homogeneous precipitation technique to serve as the precursor. Nanospheres long-lasting phosphors Y2O2S: Eu3+, Mg2+, Ti4+ were obtained by calcinating the precursor in CS2 atmosphere. XRD investigation shows a pure phase of Y2O2S, indicating no other impurity phase appeared. SEM observation reveals that the structures are nanosphere. The Y2O2S: Eu3+, Mg2+, Ti4+ nanospheres with particle size about 100–150 nm show uniform size and well-dispersed distribution. After irradiation by ultraviolet radiation with 325 nm for 5 min, the phosphor emitted red color long-lasting phosphorescence corresponding to typical emission of Eu3+ ion. The main emission peaks are ascribed to Eu3+ ions transition from 5DJ (J = 0, 1, 2) to 7FJ (J = 0, 1, 2, 3, 4). Both the PL spectra and luminance decay revealed that this phosphor had efficient luminescent and long-lasting properties. It was considered that the red-emitting long-lasting phosphorescence was due to the persistent energy transfer from the traps to the Ti4+ and Mg2+ ions. 相似文献
15.
16.
Md. Amdadul Huq Chowdury Andrew P. Monkman Nazia Chawdhury 《Journal of Polymer Research》2011,18(6):1379-1384
A systematic optical study of a series of 9,9–dyoctylefluorene-2,7-diyl-dibenzothiophene-s,-s-dioxide-3,7-diyl co-polymers
p(F-S)y has been performed where S unit (-dibenzothiophene-s,sdioxide-3,7diyl) varied from 15 to 50 mol%. We have investigated
optical absorption, steady state and time resolved photoluminescence spectroscopy at room temperature and at low temperature.
The emission band for all of these materials is red shifted from that of poly(9,9-dioctylfluorene). Except for p(F-S)50 all
our material show one phosphorescence band at low temperature. Dual phosphorescence is observed for p(F-S)50 that are originated
from different monomer units. Drop cast film of p(F-S)50 shows amplified spontaneous emission (ASE) effect peaking at 2.66 eV
with FWHM at 5 nm. 相似文献
17.
18.
赤泥是制铝工业提取氧化铝时所排出的污染性废渣,如果处理不当将会对生态环境造成极大危害。介绍了赤泥的化学成分、物相组成及产生路径,具体分析了从赤泥中回收铁、铝、钛、钪等金属资源的主要工艺及特点,详细阐述了添加适量的赤泥可增强建筑材料的力学性能和耐火性能、固化赤泥中的放射性元素、减少环境污染。目前,利用赤泥制备地聚物材料、微晶玻璃、复合材料等工艺尚不成熟,仍需寻求更高效的目标金属提纯技术和高效合理的废渣、废液处置方法,并研发出一整套的赤泥开发应用工艺。 相似文献