Full
LI Ying (1995-), female, Master candidate. E-mail: 982195550@qq.com
Outline
A series of Sr2GdNbO6:xEu3+ (x=0.04-0.12) red phosphors were prepared by a high-temperature solid-phase method, and the target products were characterized by X-ray diffraction, UV-Vis spectrophotometry and fluorescence spectroscopy. The results show that the synthesized phosphor has a monoclinic crystal structure with the space group P21/c. The structural analysis indicates that doped europium replaces Gd3+ ion in the matrix Sr2GdNbO6 with the chemical state of Eu3+ ion, thus forming a single crystal structure phosphor. Sr2GdNbO6:Eu3+ phosphor exhibits a red-orange emission under dual-wavelength excitation of blue light λex of 468 nm and near-ultraviolet light λex of 395 nm, and the main emission peaks are centered at wavelengths of 622 nm and 593 nm, which belong to the 5D0→7F2 and 5D0→7F1 energy level transitions of Eu3+, respectively. When the doping amount (x) of Eu3+ is 8%, its luminescence quantum efficiency for blue light excitation reaches the maximum value of 16%. Based on the analysis and comparison of the temperature (295-568 K) effect on the emission intensity and quantum efficiency under dual-wavelength excitation, the phosphor has a high luminescence quantum efficiency under the excitation of blue light λex of 468 nm and a higher thermal stability. Under the excitation of blue light, the average fluorescence decay lifetime of the sample Sr2GdNbO6: 0.08Eu3+ is 0.841 ms, the color coordinates are (0.648, 0.368), and the luminescence purity reaches 93%. This phosphor is a kind of red fluorescent material with the dual-wavelength response for a promising potential application.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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