Synthesis, surface and photoluminescence properties of Sm3+ doped α-Bi2O3
Synthesis, surface and photoluminescence properties of Sm3+ doped α-Bi2O3
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DOI：
10.1016/j.jallcom.2020.157221
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发表时间：
2021-02-15
影响因子：
6.2
通讯作者：
Swart, H. C.
中科院分区：
文献类型：
--
作者：
Divya, J.;Shivaramu, N. J.;Swart, H. C.
Sm 3+掺杂Bi 2 O3（0.5 - 10摩尔% Sm）粉末分离通过共沉淀法。对所合成的化合物的晶体结构、形貌、元素组成及分布、漫反射率、表面分析和发光性能进行了详细的表征和分析。未掺杂和掺杂Sm 3+的样品的晶体结构均为单斜晶系，晶粒尺寸在63至83 nm之间。场发射扫描电子显微镜分析表明针状颗粒，而在较高的掺杂剂浓度的产品还包含在针表面上的小纳米棒闭塞的存在。Sm ~（3+）在晶体中的某些位置取代了Bi，形成了氧空位。具有不同Sm 3+浓度（0.5-10摩尔%）的隔离产物的带隙保持相同，约为2.85 eV。光致发光（PL）结果表明，蓝光（490 nm）激发产生的磷光体在658 nm处具有最强的发射强度，这归因于Sm 3+离子的（4）G（5/2）-> H-6（9/2）跃迁。Sm 3+掺杂浓度为4mol%时，发光强度最大，之后由于浓度猝灭，发光强度下降，这是Sm 3+离子偶极-偶极相互作用的结果。(C)2020 Elsevier B. V.保留所有权利。
Sm3+ doped Bi2O3 (0.5 10 mol% Sm) powders were isolated by means of a co-precipitation method. The crystal structure, morphology, elemental compositions and distribution, diffuse reflectance, surface analysis and luminescence properties of the newly prepared compounds were characterized and analysed in detail. The crystal structures for the undoped and Sm3+-doped samples were monoclinic, with crystallite sizes ranging between 63 and 83 nm. Field emission scanning electron microscope analysis indicated needle-like particles, while at the higher dopant concentration the products also contained the presence of small nanorod occlusions on the needle surface. The Sm3+ substituted the Bi at certain sites in the crystal with the subsequent formation of oxygen vacancies. The band gap of the isolated products with the different Sm3+ concentration (0.5-10 mol%) remained the same at approximately 2.85 eV. Photoluminescence (PL) results revealed that blue light (490 nm) excitation produced phosphors with the strongest emission intensity at 658 nm, which is attributed to the (4)G(5/2) -> H-6(9/2), transition in the Sm3+ ion. The maximum PL was obtained for the 4 mol% Sm3+ doping concentration, after which the PL intensity decreased due to concentration quenching, which was the result of Sm3+ ion dipole-dipole interactions. (C) 2020 Elsevier B.V. All rights reserved.