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首页> 外文期刊>Physica, B. Condensed Matter >Luminescence properties of CaS:Ce, Sm nanophosphors
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Luminescence properties of CaS:Ce, Sm nanophosphors

机译：CaS：Ce，Sm纳米磷光体的发光特性

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CaS:Ce, Sm nanophosphors were synthesized via solid state diffusion method. X-Ray diffraction confirmed the cubic crystalline phase of CaS:Ce, Sm nanoparticles. The particle size calculated using DebyeScherrer formula was found to be 52 nm. The morphological investigations of the nanoparticles were made using TEM and found to have nearly spherical morphology with diameter 4550 nm, which is in close agreement with the XRD result. The PL emission characteristics of CaS:Ce, Sm as a function of cerium and samarium concentrations have been studied and CaS:Ce_(0.6)Sm_(0.4) system has maximum emission intensity, hence it was opted for further studies. The CaS:Ce_(0.6)Sm_(0.4) system showed independent emission of Sm and Ce when excited at 330 and 450 nm, respectively. To study the energy transfer between cerium and samarium, the CaS:Ce_(0.6)Sm_(0.4) was excited at wavelengths other than the excitation wavelengths of Ce (450 nm) and Sm (330 nm). The existence of Ce emission (at an excitation of 390 nm) even in the absence of Ce excitation band and Sm emission at an excitation of 405 nm, which is the excitation band of Ce, indicates the energy transfer at these two wavelengths. Thermoluminescence characteristics of ~(60)Co irradiated CaS:Ce_(0.6)Sm_(0.4) have been investigated for different doses of 0.14125 Gy. All the glow curves show a single peak at 475 K. With increasing dose, the intensity of this peak increases and a shoulder is formed on the lower temperature side at 415 K at 21 Gy of exposure. CaS:Ce_(0.6)Sm _(0.4) shows almost linear dose dependence up to 125 Gy.
机译：通过固态扩散法合成了CaS：Ce，Sm纳米磷光体。 X射线衍射证实了CaS：Ce，Sm纳米颗粒的立方晶相。发现使用DebyeScherrer公式计算的粒径为52nm。纳米颗粒的形貌研究是用TEM进行的，发现其直径为4550 nm，具有接近球形的形貌，这与XRD结果非常吻合。已经研究了CaS：Ce，Sm随铈和a浓度变化的PL发射特性，并且CaS：Ce_（0.6）Sm_（0.4）系统具有最大的发射强度，因此选择进行进一步研究。当分别在330和450 nm激发时，CaS：Ce_（0.6）Sm_（0.4）系统显示出Sm和Ce的独立发射。为了研究铈与sa之间的能量转移，在除Ce（450 nm）和Sm（330 nm）的激发波长以外的其他波长下激发CaS：Ce_（0.6）Sm_（0.4）。即使不存在Ce激发带，也存在Ce发射（在390 nm激发下），而在Ce的激发带即405 nm激发下出现Sm发射，表明在这两个波长下的能量转移。研究了〜（60）Co辐照的CaS：Ce_（0.6）Sm_（0.4）的热致发光特性，其剂量为0.14125 Gy。所有辉光曲线均在475 K处显示一个峰。随着剂量的增加，该峰的强度增加，并且在21 Gy暴露下在415 K处的较低温度侧形成肩部。 CaS：Ce_（0.6）Sm _（0.4）显示线性剂量依赖性高达125 Gy。

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