Kadam A R, Dhoble S J
Department of Physics, R.T.M. Nagpur University, Nagpur, India.
Luminescence. 2019 Dec;34(8):846-853. doi: 10.1002/bio.3681. Epub 2019 Jul 11.
Rare-earth ions play an important role in eco-friendly solid-state lighting for the lighting industry. In the present study we were interested in Eu ion-doped inorganic phosphors for near ultraviolet (UV) excited light-emitting diode (LED) applications. Eu ion-activated SrYAl O phosphors were prepared using a solution combustion route at 550°C. Photoluminescence characterization of SrYAl O :Eu phosphors showed a 612 nm emission peak in the red region of the spectrum due to the D → F transition of Eu ions under excitation at 395 nm in the near-UV region and at the 466 nm blue excitation wavelength. These red and blue emissions are supported for white light generation for LED lighting. Structure, bonding between each element of the sample and morphology of the sample were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), which showed that the samples were crystallized in a well known structure. The phosphor was irradiated with a Co-γ (gamma) source at a dose rate of 7.2 kGy/h. Thermoluminescence (TL) studies of these Eu -doped SrYAl O phosphors were performed using a Nucleonix TL 1009I TL reader. Trapping parameters of this phosphor such as activation energy (E), order of kinetics (b) and frequency factor (s) were calculated using Chen's peak shape method, the initial rise method and Ilich's method.
稀土离子在照明行业的环保固态照明中发挥着重要作用。在本研究中，我们关注用于近紫外（UV）激发发光二极管（LED）应用的Eu离子掺杂无机磷光体。采用溶液燃烧法在550°C制备了Eu离子激活的SrYAlO磷光体。SrYAlO:Eu磷光体的光致发光表征显示，由于Eu离子在近紫外区域395nm激发以及466nm蓝色激发波长下的D→F跃迁，在光谱的红色区域出现了612nm发射峰。这些红色和蓝色发射可用于LED照明的白光产生。使用X射线衍射（XRD）和扫描电子显微镜（SEM）分析了样品各元素之间的结构、键合以及样品的形态，结果表明样品以一种已知结构结晶。用Co-γ（伽马）源以7.2kGy/h的剂量率对磷光体进行辐照。使用Nucleonix TL 1009I TL读数器对这些Eu掺杂的SrYAlO磷光体进行热释光（TL）研究。使用陈峰形法、初始上升法和伊利奇法计算了该磷光体的俘获参数，如激活能（E）、动力学级数（b）和频率因子（s）。
