Sahu Ishwar Prasad, Bisen D P, Murthy K V R, Tamrakar R K
School of Studies in Physics & Astrophysics, Pt. Ravishankar Shukla University, Raipur, India.
Faculty of Technology and Engineering, MS University of Baroda, Baroda, Gujarat, India.
Luminescence. 2017 Nov;32(7):1263-1276. doi: 10.1002/bio.3320. Epub 2017 May 29.
Ca MgSi O :Ce , Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors were prepared using the solid-state reaction method. The crystal structures of the sintered phosphors were of melilite type, which has a tetragonal crystallography. The chemical compositions of the sintered phosphors was confirmed by energy dispersive X-ray spectroscopy. The different thermoluminescence kinetic parameters [activation energy (E), frequency factor (s) and order of the kinetics (b)] of these phosphors were evaluated and compared using the peak shape method. Under ultraviolet excitation, the emission spectra of both Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors were composed of a broad emission band peaking at 530 nm. When the Ca MgSi O :Eu phosphor is co-doped with Ce ions, photoluminescence, afterglow and mechanoluminescence intensity was strongly enhanced. Ca MgSi O :Eu showed some afterglow with a short persist time. On incorporation of Ce , efficient energy transfer from Ce to Eu was found and the emission intensity of Eu was enhanced. The mechanoluminescence intensities of Ca MgSi O :Ce , Ca MgSi O :Eu and Ca MgSi O :Eu ,Ce phosphors increased proportionally increased with the increase in impact velocity, which suggests that these phosphors can be used as sensors to detect stress in an object.
采用固态反应法制备了CaMgSiO₄:Ce、CaMgSiO₄:Eu和CaMgSiO₄:Eu,Ce荧光粉。烧结后的荧光粉晶体结构为黄长石型，具有四方晶体学结构。通过能量色散X射线光谱法确定了烧结荧光粉的化学成分。利用峰形法评估并比较了这些荧光粉不同的热释光动力学参数[活化能(E)、频率因子(s)和动力学级数(b)]。在紫外激发下，CaMgSiO₄:Eu和CaMgSiO₄:Eu,Ce荧光粉的发射光谱均由一个在530nm处达到峰值的宽发射带组成。当CaMgSiO₄:Eu荧光粉与Ce离子共掺杂时，光致发光、余辉和机械发光强度均显著增强。CaMgSiO₄:Eu表现出一些持续时间较短的余辉。掺入Ce后，发现了从Ce到Eu的有效能量转移，Eu的发射强度增强。CaMgSiO₄:Ce、CaMgSiO₄:Eu和CaMgSiO₄:Eu,Ce荧光粉的机械发光强度随冲击速度的增加而成比例增加，这表明这些荧光粉可作为检测物体应力的传感器。
