Novel Hierarchical YBO 3 :Eu 3+ Nanocrystals Synthesized by Folic Acid Assisted Hydrothermal Process
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.455
Novel Hierarchical YBO3 :Eu3+ Nanocrystals Synthesized by Folic Acid Assisted Hydrothermal Process Xianj. Xing1 , Shan Li2, Yuq. Song2, Yingz. Ge3, Xuef. Zhang1, Wen Jiang4 and Xianwen. Zhang3 * 1
School of Mechanical Engineering , Hefei University of Technology, Hefei, Anhui 230009, China
2 School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei, Anhui 230009, China
3 School of Automobile and Transportation Engineering, Hefei University of Technology, Hefei, Anhui 23 0009, China
4 School of Food and Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
ABSTRACT
YBO3:Eu3+ crystals with flower-like hierarchitecture are readily synthesized through a folic acid assisted hydrothermal process using polyborate precursors in the aqueous solution. It was found that the pH value , borate/yittrium ratio and the mass of folic acid take effects on the morphology and photoluminescence emission intensity of YBO3:Eu3+ crystals. The product with the small flower-like hierarchitecture was obtained under the conditions of pH value at 9, borate/yittrium ratio at 2 and the mass of folic acid at 0.44 g, showing the strongest photoluminescence intensity. The growth process of the YBO3:Eu3+ flowers and microflowers was invesitgated based on the time-dependent experiments, which showed that the growth mechanism of the flower-like hierarchitecture follows an in situ growth rather than selfassembly process as reported previously. Such a hydrothermal route using folic acid as a capping agent may provide a green and effective method for fabricating useful and complex 3D architectures of LEDs phosphors.
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INTRODUCTION Advanced nano-/micro-materials with hierarchitecture and tunable morphologies have attracted extensive interest recently owing to their broad application potentials, particularly optical properties depending on size and morphology [1-6]. It has been well established that the physical properties can be improved by controlling the features (morphology, size, dimensionality, and structure) of the advanced materials during the synthesis. However, improper crystal structure and shape of the materials would limit their practical applications. So, it is a great challenge to obtain inorganic materials with controllable morphology, orientation, dimensionality etc., which eventually influence their physical properties. In order to address the challenges of increasing demands, there has been a significant interest in the development of morphology-controllable materials. Particularly, more attention has been paid to the assembly of low-dimensional building blocks (including nanoparticles [1,2], nanorods [3, 4], graphenes [5,6] and nanoflakes [7] via bottom-up
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