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One-step surfactant-free synthesis of KSc2F7 microcrystals: controllable phases, rich morphologies and multicolor down conversion luminescence properties†
CrystEngComm ( IF 3.1 ) Pub Date : 2018-06-27 00:00:00 , DOI: 10.1039/c8ce00716k
Jie Xiong 1, 2, 3, 4 , Jie Yu 2, 3, 4, 5 , Yufeng Zhang 1, 2, 3, 4 , Wenpeng Xia 1, 2, 3, 4 , Shanshan Hu 1, 2, 3, 4 , Yanfei Zhang 4, 6, 7 , Jun Yang 1, 2, 3, 4
Affiliation  

Homogeneous KSc2F7 microcrystals with controlled and abundant morphologies were prepared by a one-step hydrothermal route without employing any templates or surfactants. Particularly, uniform and well-defined KSc2F7 crystals with rod, sheet, flower-like, thin rectangular, xylitol-like and thin plate morphologies were achieved by manipulating the different environments of crystal growth, such as increasing the concentration of F, changing pH and adding different surfactants. In addition, a phase transformation from monoclinic ScF3 to orthorhombic KSc2F7 was observed at different molar ratios of F/Sc and pH values, respectively. A more interesting thing is that the KSc2F7 crystals doped with 5% Ln3+ (Ln = La, Ce, Sm, Eu, Gd, Tb and Lu) showed rich morphologies and various sizes. The obtained KSc2F7:Ln3+ products showed multicolor emission with red (Eu3+), green (Tb3+) and blue (Ce3+), respectively. And the best emission conditions for KSc2F7 crystals are F/Sc/K = 3.5 : 1 : 3, pH = 7 and without any surfactants. The synthetic KSc2F7:Eu3+/Tb3+/Ce3+ phosphors may potentially be used for multicolor illumination and displays.

中文翻译:

一步法合成无表面活性剂的KSc 2 F 7微晶:可控相,丰富的形貌和多色下转换发光性能

通过一步水热法,无需使用任何模板或表面活性剂,即可制得具有可控且形态丰富的均相KSc 2 F 7微晶。尤其是,通过控制不同的晶体生长环境(例如增加F-的浓度),可以获得具有棒状,片状,花状,薄矩形,木糖醇状和薄板形态的均匀且轮廓分明的KSc 2 F 7晶体,改变pH值并添加不同的表面活性剂。此外,从单斜ScF 3到正交晶体KSc 2 F 7的相变。分别在F / Sc和pH值的不同摩尔比下观察到。更有趣的是,掺有5%Ln 3+的KSc 2 F 7晶体(Ln = La,Ce,Sm,Eu,Gd,Tb和Lu)显示出丰富的形貌和各种尺寸。所获得的KSc 2 F 7:Ln 3+产物显示出多色发射,分别具有红色(Eu 3+),绿色(Tb 3+)和蓝色(Ce 3+)。KSc 2 F 7晶体的最佳发射条件是F / Sc / K = 3.5:1:3,pH = 7,并且没有任何表面活性剂。合成KSc 2 F 7:Eu 3+/ Tb 3+ / Ce 3+荧光粉可能会用于多色照明和显示。
更新日期:2018-06-27
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