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Investigation of luminescence properties and the energy transfer mechanism of tunable emitting Sr3Y2(Si3O9)2:Eu2+,Tb3+ phosphors
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zhang, Mengfei Liang, Yujun Xu, Shuangyu Zhu, Yingli Wu, Xingya Liu, Shiqi |
| Copyright Year | 2016 |
| Abstract | A series of Eu2+ and Tb3+ singly-doped and co-doped Sr3Y2(Si3O9)2 (SYSO) phosphors have been synthesized via a conventional high-temperature solid-state reaction. The crystal structures, photoluminescence properties, fluorescence lifetimes, thermal properties and energy transfer of SYSO:Eu2+,Tb3+ were systematically investigated in detail. Rietveld structure refinement of the obtained phosphors indicated that the SYSO host crystallized in a monoclinic system with the space group C2/c (15) and there are three kinds of cation sites for the doped ions to occupy forming emission centers. The photoluminescence (PL) emission bands of SYSO:xEu2+ show a red-shift tendency with increasing Eu2+ content which should be attributed to more Eu2+ ions entering into Sr2/Y2 and Sr3/Y3 sites from the Sr1/Y1 site. For the co-doped SYSO:Eu2+,Tb3+ samples, tunable colors from cyan to green can be realized by varying the doping concentration of the Tb3+ ions. The intense green emission was realized in the SYSO:Eu2+,Tb3+ phosphors on the basis of the highly efficient energy transfer from Eu2+ to Tb3+ with an efficiency of over 89%. As a result, the emission intensity of SYSO:0.01Eu2+,0.21Tb3+ is about 2.5 times higher than that of SYSO:0.21Tb3+ under 340 nm UV excitation. The energy transfer mechanism from Eu2+ to Tb3+ in the SYSO host was ascribed to the quadrupole–quadrupole interactions. These results indicated that the SYSO:Eu2+,Tb3+ phosphors can act as single-phase green emitting phosphors for possible applications in ultraviolet light-based white light-emitting diodes (w-LEDs). |
| Starting Page | 68 |
| Ending Page | 76 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C5CE01814E |
| Volume Number | 18 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c5/ce/c5ce01814e/c5ce01814e1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C5CE01814E |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
