Hydrothermal synthesis of NaLa(WO4)2:Eu3+ octahedrons and tunable luminescence by changing Eu3+ concentration and excitation wavelength
| Autor: | Yanxia Tang, Yaping Gao, Xiongfei Guo, Wenzhong Yin, Yongfei Ye, Haihui Liu, Hongxia Tang |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Doping Analytical chemistry Nanotechnology Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Emission intensity Atomic and Molecular Physics and Optics Hydrothermal circulation 0104 chemical sciences Electronic Optical and Magnetic Materials Ion Hydrothermal synthesis Electrical and Electronic Engineering 0210 nano-technology Luminescence Excitation |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:1301-1306 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-016-5659-y |
| Popis: | NaLa(WO4)2:Eu3+ phosphors with different Eu3+ concentrations have been synthesized by a hydrothermal method. The phase is confirmed by XRD analysis, which shows a pure-phase NaLa(WO4)2 XRD pattern for all of NaLa(WO4)2:Eu3+ phosphors. The SEM and TEM images indicate that all of NaLa(WO4)2:Eu3+ phosphors have a octahedral morphology. These suggest that the Eu3+ doping has no influence on the structure and growth of NaLa(WO4)4 particles. By monitoring the emission of Eu3+ at 615 nm, NaLa(WO4)2:Eu3+ phosphors show excitation bands originating from both host and Eu3+ ions. Under the excitation at 271 nm corresponding to WO4 2− groups, emission bands coming from the 1A1 → 3T1 transition with the WO4 2− groups and the 5D0 → 7Fj (j = 0, 1, 2, 3 and 4) transitions of Eu3+ are observed. The emission intensity relating to WO4 2− groups decreases with increasing Eu3+ concentration. But emission intensities of Eu3+ increase firstly and then decreases because of concentration quenching effect. Under the excitation at 395 nm corresponding to 7F0 → 5L6 transition of Eu3+, only characteristic Eu3+ emission bands can be observed. The results of this work suggest that tunable luminescence can be obtained for Eu3+ doped NaLa(WO4)2 phosphors by changing Eu3+ concentration and excitation wavelength. |
| Databáze: | OpenAIRE |
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