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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Synthesis and optical properties of Mn-doped CaWO4 nanoparticles
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Synthesis and optical properties of Mn-doped CaWO4 nanoparticles

机译：Mn掺杂的Cawo4纳米粒子的合成与光学性质

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摘要

Pure and Mn-doped calcium tungstate (Mn:CaWO4) nanoparticles (NPs) were synthesized by hydrothermal method which lead to the formation of high quality and narrow sized particles. The concentration of Mn in CaWO4 NPs was varied from 1% to 4% by weight. A distinct peak of Mn (d-d) transition was observed which is actually spin-forbidden but may be allowed due to crystal field effects. Electron spin resonance measurements revealed inclusion of Mn2+ at the substitutional site.. Room temperature photoluminescence emission (PL) and excitation (PLE) spectroscopies were carried out to understand the interactions of sp-d levels. PL spectra revealed the presence of both band-edge (similar to 450 nm) and Mn2+ related orange luminescence (similar to 530 nm). Time dependent photoluminescence (TDPL) studies were also carried out where the life time value of 4.3 ms obtained was in accordance with measurement for Mn in other systems. Thus TDPL further strengths the presence of Mn in 2+ state in CaWO4 NPs.
机译：通过水热法合成纯净和Mn掺杂的钨酸钙（Mn：Cawo4）纳米颗粒（NPS），其导致形成高质量和窄尺寸粒子的形成。 Cawo4 NPS中Mn的浓度从1％〜4重量％变化。观察到Mn（D-D）转变的明显峰值，其实际上是旋转的，但是由于晶体场效应可能被允许。电子自旋共振测量显示在替代部位的含有Mn2 +。室温光致发光发射（PL）和激发（PLE）光谱进行以了解SP-D水平的相互作用。 PL光谱揭示了带边缘（类似于450nm）和Mn2 +相关橙色发光（类似于530nm）的存在。还进行了时间依赖性光致发光（TDP1）研究，其中在得到的4.3ms的寿命时间值符合其他系统中的MN的测量。因此，TDP1进一步强度在Cawo4 NPS中强度在2+状态下存在Mn。

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