ZHANG Han (1995-), female, Master candidate. E-mail: 1142378575@qq.com
A novel red-emitting phosphor CaAl12-x-y(PO4)0.1O18.85: xMn4+, yMg2+ was synthesized by a high-temperature solid-state method. The crystal structure and luminescence properties of the samples were characterized by X-ray diffraction, scanning electron microscopy and fluorescence spectroscopy. The results show that the synthesized phosphor has a hexagonal crystal structure with the space group of P63/mmc. The optimal doping amounts of Mn4+ and Mg2+ are x of 0.01 and y of 0.1, respectively. Under excitation at 396 nm, CaAl11.89(PO4)0.1O18.85: 0.01Mn4+, 0.1Mg2+ phosphor shows the maximum red light emission at 654 nm, corresponding to 2E→4A2g transition of Mn4+. The luminescence intensity and lifetime of phosphor are improved due to the co-doping with Mg2+ charge compensator. The absolute quantum efficiency of phosphor is 60%, the fluorescence lifetime is 0.97 ms, the color coordinate is in the deep-red region, and the color purity is 97%. The luminescence intensity is still 60% of the initial intensity when the temperature increases to 413K, indicating that this red phosphor with a superior thermal stability is a novel red luminescent material with broad application prospects.
| 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 |