Sahu Ishwar Prasad, Bisen D P, Brahme Nameeta, Ganjir Manju
School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur (C.G.), Pin-492010, India.
Luminescence. 2015 Dec;30(8):1318-25. doi: 10.1002/bio.2900. Epub 2015 Apr 6.
Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) long afterglow phosphors were synthesized under a weak reducing atmosphere by the traditional high temperature solid state reaction method. The synthesized phosphors were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and photo-, thermo- and mechanoluminescence spectroscopic techniques. The phase structure of the sintered phosphor was an akermanite type structure, which belongs to tetragonal crystallography. The thermoluminescence properties of these phosphors were investigated and compared. Under ultraviolet light excitation, the emission spectra of both prepared phosphors were composed of a broad emission band peaking at 470 nm. When the Sr2MgSi2O7:Eu(2+) phosphor was co-doped with Dy(3+), the photoluminescence (PL), afterglow and mechanoluminescence (ML) intensity were strongly enhanced. The decay graph indicated that both the sintered phosphors contained fast decay and slow decay processes. The ML intensities of Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) phosphors were increased proportionally with increasing impact velocity, a finding that suggests that these phosphors could be used as sensors to detect the stress of an object.
采用传统高温固相反应法在弱还原气氛下合成了Sr2MgSi2O7:Eu(2+)和Sr2MgSi2O7:Eu(2+),Dy(3+)长余辉荧光粉。通过粉末X射线衍射（XRD）、能量色散X射线光谱（EDX）以及光致发光、热释发光和机械发光光谱技术对合成的荧光粉进行了表征。烧结荧光粉的相结构为硅钙镁石型结构，属于四方晶系。研究并比较了这些荧光粉的热释发光性能。在紫外光激发下，两种制备的荧光粉的发射光谱均由一个在470 nm处有峰值的宽发射带组成。当Sr2MgSi2O7:Eu(2+)荧光粉与Dy(3+)共掺杂时，光致发光（PL）、余辉和机械发光（ML）强度均显著增强。衰减曲线表明，两种烧结荧光粉均包含快速衰减和缓慢衰减过程。Sr2MgSi2O7:Eu(2+)和Sr2MgSi2O7:Eu(2+),Dy(3+)荧光粉的ML强度随冲击速度的增加而成比例增加，这一发现表明这些荧光粉可作为检测物体应力的传感器。
