【摘要】 用高温固相法合成了红色长余辉发光材料LiAl5O8∶Mn4+,Li5AlO4∶Mn4+,LiAlO2∶Mn4+,发现前两种材料有红色余辉,这方面并没有报道过,并对这两种材料的发光性能作了研究,指明了不同基质中发光强弱不同原因。对不同Mn4+掺杂浓度的材料做了浓度依赖关系研究,确认Mn4+的发光是2E→4A2的跃迁。Mn4+的发光是个宽带谱,材料在紫外区有强的吸收,发射谱范围可达620~770nm,峰值在675nm。对长余辉机制进行了探讨。更多还原

【Abstract】 As a new generation of long afterglow phosphors, rare earth doped aluminates are drawing more and more attention. However, though the blue and the green phosphors with excellent afterglow performance are put into commercial use, the red afterglow phosphor doped with Dy3+ or Tb3+ suitable for illuminating is still dissatisfied with the white afterglow phosphor. We developed a new way to meet the conditions of red afterglow phosphor: aluminates doped with Mn4+.Following this new method, we synthesize LiAl5O8∶Mn4+ ,Li5AlO4∶Mn4+ , LiAlO2∶Mn4+,and find that the former two have red long afterglow, this have not been reported before, then the luminescent properties of the two kinds of materials were studied, the reason of different intensity in different hosts was pointed out. We also test the intensity-concentration curve, notate that the radiation of Mn4+ is due to transition of 2E→4A2, its emission spectrum is a broad band, peaked at 675 nm. It absorb ultraviolet strongly, the excitation spectrum extends from 620 nm to 770 nm, At last we research the mechanism of long afterglow of these materials, discuss why the long afterglow properties are different between these kinds of materials.更多还原