当前位置: X-MOL 学术J. Mater. Chem. C › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Discovery of a new phosphor via aliovalent cation substitution: DFT predictions, phase transition and luminescence properties for lighting and anti-counterfeiting applications
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-12-23 , DOI: 10.1039/d0tc05379a
Hongmin Liu 1, 2, 3, 4 , Wenye Zhang 1, 2, 3, 4 , Hongwei Liang 1, 2, 3, 4 , Qingguang Zeng 1, 2, 3, 4 , Jianxin Shi 4, 5, 6, 7, 8 , Dawei Wen 1, 2, 3, 4
Affiliation  

Over the last two decades, suitable compositions have been investigated to make new phosphors because they are key materials for use in solid-state lighting and security applications. Aliovalent cations have different radii, electronegativity and valence states, and can thus be used to remarkably modify crystal structures. Here, we report a new Sr33Lu6(PO4)28 phase produced from Sr3(PO4)2 via the method of aliovalent cation substitution. Density functional theory calculations were used to predict the possibility of the formation of a new phase when substituting three Sr2+ for two Lu3+ ions in the material. The new phase, Sr33Lu6(PO4)28, was confirmed by X-ray diffraction, electron diffraction and photoluminescence spectroscopy. Different from the purple phosphor Sr3(PO4)2:Eu2+, Sr33Lu6(PO4)28:Eu2+ exhibits broad green emission under near-UV excitation due to the multi-site occupancy of Eu2+. Combining near-UV chip, blue, red and Sr33Lu6(PO4)28:Eu2+ green phosphors, a white light-emitting diode with a high colour rendering index (∼92) was made, with potential lighting applications. Additionally, a transparent security ink fabricated using the Sr33Lu6(PO4)28:Eu2+ phosphor shows high concealment and recognition. This work is not confined to the report of a new Sr33Lu6(PO4)28:Eu2+ phosphor and its corresponding applications; it is expected that aliovalent cation substitution will be useful as a general method for the discovery of new materials.

中文翻译:

通过铝价阳离子取代发现一种新的荧光粉:用于照明和防伪应用的DFT预测,相变和发光特性

在过去的二十年中,已经研究了合适的组合物以制备新的磷光体,因为它们是用于固​​态照明和安全应用的关键材料。铝价阳离子具有不同的半径,电负性和价态,因此可用于显着修饰晶体结构。在此,我们报告了通过铝价阳离子取代方法从Sr 3(PO 42产生的新Sr 33 Lu 6(PO 428相。用密度泛函理论计算来预测当用三个Sr 2+代替两个Lu 3+时形成新相的可能性 材料中的离子。通过X射线衍射,电子衍射和光致发光光谱确认了新相Sr 33 Lu 6(PO 428。与紫色荧光粉Sr 3(PO 42:Eu 2+不同,Sr 33 Lu 6(PO 428:Eu 2+由于Eu 2+的多位占据,在近紫外光激发下表现出宽绿色发射。。结合了近紫外线芯片,蓝色,红色和Sr 33 Lu 6(PO 428:Eu制作了2种以上的绿色磷光体,即具有高显色指数(〜92)的白色发光二极管,具有潜在的照明应用。另外,使用Sr 33 Lu 6(PO 4 28:Eu 2+荧光粉制造的透明安全油墨显示出较高的遮盖力和识别度。这项工作不限于新的Sr 33 Lu 6(PO 4 28:Eu 2+荧光粉及其相应应用的报告;可以预期的是,铝价阳离子取代将用作发现新材料的一般方法。
更新日期:2021-01-11
down
wechat
bug