排序方式: 共有16条查询结果,搜索用时 0 毫秒
1.
Eu3+ doped Gd2WO6 and Gd2(WO4)3 nanophosphors with different concentrations were prepared via a co-precipitation method. The structure and morphology of the nanocrystal samples were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The emission spectra and excitation spectra of samples were measured. J-O parameters and quantum efficiencies of Eu3+ 5D0 energy level were calculated, and the concentration quenching of Eu3+ luminescence in different matrixes were studied. The results indicated that effective Eu3+:5D0-7F2 red luminescence could be achieved while excited by 395 nm near-UV light and 465 nm blue light in Gd2WO6 host, which was similar to the familiar Gd2(WO4)3:Eu. Therefore, the Gd2WO6:Eu red phosphors might have a potential application for white LED. 相似文献
2.
采用高温熔融法制备了掺Er3 :TeO2-B2O3-SiO2-Na2O系列玻璃样品.对样品吸收光谱、发射光谱、差热曲线和Er3 :4I13/2能级的荧光寿命进行了测试和分析.计算得到Er3 的J-O强度参数Ωλ(λ=2,4,6),讨论了SiO2的含量对Er3 在该系列玻璃样品中发光性能的影响.结果表明,SiO2的引入有效提高了玻璃材料的有效发射带宽和热稳定性,有效抑制了材料的荧光上转换效应.同时,计算得到Er3 :4I13/2→4I15/2能级的量子效率为ηmax=63%. 相似文献
3.
4.
Er3+ and Li+ codoped Y3Al5O12(YAG) powders were prepared for a systematic investigation of their upconversion emissions.X-ray diffraction(XRD),upconversion emission spectra,pump power dependence,FT-IR spectra and decay time were studied to characterize the samples.With Li+ doping,the upconversion emission intensity of Er3+ doped YAG powders was obviously enhanced,accompanied with an increase in the ratio of green to red intensity.The enhancement of emission intensity could be attributed to two mechanisms:on... 相似文献
5.
6.
新型掺铒碲酸盐玻璃光谱性质和热稳定性研究 总被引:1,自引:0,他引:1
采用高温熔融法制备了掺Er^3+:TeO2-B2O3-SiO2-Na2O系列玻璃样品。对样品吸收光谱、发射光谱、差热曲线和Er^3+:4I 13/2能级的荧光寿命进行了测试和分析。计算得到Er^3+的J-O强度参数Ωλ(λ=2,4,6),讨论了SiO2的含量对Er^3+在该系列玻璃样品中发光性能的影响。结果表明,SiO2的引入有效提高了玻璃材料的有效发射带宽和热稳定性,有效抑制了材料的荧光上转换效应。同时,计算得到Er^3+:^4 I13/2→^4I 15/2能级的量子效率为ηmax=63%。 相似文献
7.
8.
9.
采用微波法合成了Eu3+∶Y2O3纳米晶,通过控制制备条件得到了不同形貌的Eu3+∶Y2O3纳米晶.Eu3+∶Y2O3纳米晶的形貌随微波反应时间变化明显,当反应时间延长时,Eu3+∶Y2O3纳米晶由纳米球过度为纳米棒,表面态减少.随着表面态减少S6格位与C2格位比值增加,且电荷迁移带发生红移.同时,Eu3+∶Y2O3纳米晶的发光增强.结果表明Eu3+∶Y2O3纳米晶的发光行为与表面态关系密切. 相似文献
10.
纳米晶ZrO2-Al2O3:Dy3+的制备及发光性质的研究 总被引:1,自引:0,他引:1
为了研究纳米晶ZrO2-Al2O3:Dy3+的晶相变化、发光特性及ZrO2-Al2O3与Dy3+之间是否有能量传递,采用化学共沉淀法制备了纳米晶ZrO2-Al2O3:Dy3+复合粉体。用X射线衍射图对粉体进行表征。随着煅烧温度的增加,粉末的晶相发生变化。通过对粉体晶相的分析可知,ZrO2和Al2O3在1100℃至1200℃时固溶,在1300℃时有一小部分固溶。用353nm的波长激发基质,从发射光谱中看到Dy3+丰富的发射能级,其发射光谱的主发射峰在483nm和583nm处,以483nm为激发波长得到激发光谱。结果表明,由于激发光谱中包含了来自于对基质的吸收,基质ZrO2-Al2O3和Dy3+之间存在能量传递。 相似文献