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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dual function of rare earth doped nano Bi _2O _3: White light emission and photocatalytic properties
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Dual function of rare earth doped nano Bi _2O _3: White light emission and photocatalytic properties

机译：稀土掺杂纳米Bi _2O _3的双重功能：白光发射和光催化性能

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Undoped Bi _2O _3 and single and double doped Bi _2O _3:M (where M = Tb ~(3+) and Eu ~(3+)) nanophosphors were synthesized through a simple sonochemical process and characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), EDS, diffuse reflectance (DRS) and photoluminescence (PL) spectrophotometry. The TEM micrographs show that resultant nanoparticles have a rod-like shape. Energy transfer was observed from host to the dopant ions. Characteristic green emissions from Tb ~(3+) ions and red emissions from Eu ~(3+) ions were observed. Interestingly, the Commission International de l'Eclairage (CIE) coordinates of the double doped Bi _2O _3:Eu ~(3+)(0.8%):Tb ~(3+)(1.2%) nanorods lie in the white light region of the chromaticity diagram and it has a quantum efficiency of 51%. The undoped Bi _2O _3 showed a band gap of 3.98 eV which is red shifted to 3.81eV in the case of double doped Bi _2O _3:Eu ~(3+)(0.8%):Tb ~(3+)(1.2%) nanorods. The photocatalytic activities of undoped nano Bi _2O _3 and double doped nano Bi _2O _3:Eu ~(3+)(0.8%):Tb ~(3+)(1.2%) were evaluated for the degradation of Rhodamine B under UV irradiation of 310 nm. The results showed that Bi _2O _3:Eu ~(3+)(0.8%):Tb ~(3+)(1.2%) had better photocatalytic activity compared to undoped nano Bi _2O _3. The evolution of CO _2 was realized and these results indicated the continuous mineralization of rhodamine B during the photocatalytic process. Thus double doped Bi _2O _3:Eu ~(3+)(0.8%):Tb ~(3+)(1.2%) nanorods can be termed as a bifunctional material exhibiting both photocatalytic properties and white light emission.
机译：通过简单的声化学法合成了未掺杂的Bi _2O _3和单，双掺杂的Bi _2O _3：M（其中M = Tb〜（3+）和Eu〜（3+））纳米磷光体，并通过X射线衍射（XRD）进行了表征。 ），扫描电子显微镜（SEM），透射电子显微镜（TEM），高分辨率透射电子显微镜（HRTEM），EDS，漫反射（DRS）和光致发光（PL）分光光度法。 TEM显微照片显示，所得纳米颗粒具有杆状形状。观察到从主体到掺杂离子的能量转移。观察到Tb〜（3+）离子的特征性绿色发射和Eu〜（3+）离子的特征性红色发射。有趣的是，双掺杂Bi _2O _3：Eu〜（3 +）（0.8％）：Tb〜（3 +）（1.2％）纳米棒的国际照明委员会（CIE）坐标位于的白光区域色度图，它的量子效率为51％。未掺杂的Bi _2O _3的带隙为3.98 eV，在双掺杂Bi _2O _3：Eu〜（3 +）（0.8％）：Tb〜（3 +）（1.2％）的情况下，红移至3.81eV。纳米棒。评价了未掺杂的纳米Bi _2O _3和双掺杂的纳米Bi _2O _3：Eu〜（3 +）（0.8％）：Tb〜（3 +）（1.2％）的光催化活性对若丹明B在UV辐射下的降解。 310 nm。结果表明，与未掺杂的纳米Bi _2O _3相比，Bi _2O _3：Eu〜（3 +）（0.8％）：Tb〜（3 +）（1.2％）具有更好的光催化活性。实现了CO _2的析出，这些结果表明罗丹明B在光催化过程中连续矿化。因此，可以将双掺杂的Bi _2O _3：Eu〜（3 +）（0.8％）：Tb〜（3 +）（1.2％）纳米棒称为具有光催化性能和白光发射性能的双功能材料。

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