Phase-Conversion Synthesis of Multi-Type Rare Earth Compounds with Re(Oh)So4 as a New Template : Fast Reaction Kinetic, and Photoluminescence
The lowest OH - /RE 3+ molar ratio of hydroxide sulfate RE(OH)SO 4 (RE = rare earth) makes it an ideal template for synthesis of rare earth compounds via phase conversion which is shown in this work by the direct generation of (La,Eu)F 3 with fast reaction kinetics (room temperature, 30 min). Studies show that (La,Eu)F 3 can be readily produced from (La,Eu)(OH)SO 4 in wide reaction temperature (RT-200 o C) and time (0.5-24 h) ranges. Rare earth phosphate ((La,Eu)PO 4 ), tungstate (Na(La,Eu)(WO 4 ) 2 ), and molybdate (Na(La,Eu)(MoO 4 ) 2 ) can also be derived from (La,Eu)(OH)SO 4 in the presence of proper anion sources. The photoluminescence of the (La,Eu)(OH)SO 4 and derivate compounds were comprehensively investigated, including excitation/emission spectra, decay kinetics, quantum yields, color coordinates, and color purities. Calcination at 300-800 o C further improved the quantum yield of (La,Eu)PO 4 , Na(La,Eu)(WO 4 ) 2 , and Na(La,Eu)(MoO 4 ) 2 without changing phase purities. The (La,Eu)F 3 maintained its phase purity after 300-500 o C calcination but trace (La,Eu)OF appeared at 800 o C. The quantum yields of products calcined from (La,Eu)F 3 , (La,Eu)PO 4 , Na(La,Eu)(WO 4 ) 2 , and Na(La,Eu)(MoO 4 ) 2 at 800 o C are ~72.72%, 87.59%, 53.06%, and 87.08%, respectively. It is believed that the RE(OH)SO 4 compounds proposed in this work may find applications for the synthesis of other rare earth compounds
Year of publication: |
[2022]
|
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Authors: | Wang, Xuejiao ; Sun, Meng ; Xin, Shuangyu ; Wang, Chuang ; Zhu, Ge ; Wang, Qiushi ; Li, Ji-Guang |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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