光学学报, 2019, 39 (8): 0816002, 网络出版: 2019-08-07
绿色荧光粉Sr3P4O13∶Ce 3+,Tb 3+的发光特性及Ce 3+→Tb 3+能量传递机理 下载: 558次
Luminescence Properties and Energy Transfer Mechanism of Sr3P4O13∶Ce
3+,Tb
3+ Green Phosphors
材料 磷酸盐 Ce
3+和Tb
3+共掺杂 发光性能 能量传递 materials phosphate Ce
3+ Tb
3+co-doping luminous properties energy transfer
摘要
采用高温固相法合成Sr3P4O13∶Ce
3+,Tb
3+荧光粉,通过X射线衍射仪、扫描电子显微镜和荧光光谱仪分析该荧光粉的物相组成、颗粒形貌和发光性能。结果表明:Sr3P4O13∶Ce
3+的发射光谱和Sr3P4O13∶Tb
3+的激发光谱在300~400 nm有重叠;在近紫外光(290 nm)激发下,该荧光粉发射出Ce
3+的蓝光(300~420 nm)和Tb
3+的黄绿光(480~500 nm和530~560 nm);当Ce
3+的摩尔分数为0.08,Tb
3+的摩尔分数从0.01增大到0.09时,Ce
3+的4f→5d电子跃迁将能量传递至Tb
3+的
5D3能级和
5D4能级,Ce
3+的发光强度逐渐降低,Tb
3+的发光强度逐渐增强,表明Sr3P4O13基质中存在Ce
3+→Tb
3+的能量传递;当掺杂Tb
3+的摩尔分数为0.09时,能量传递效率可高达86.46%;样品Sr2.61P4O13∶0.24Ce
3+,0.15Tb
3+的色坐标在绿光区域,因此Ce
3+和Tb
3+共掺杂的Sr3P4O13荧光粉可作为绿色荧光材料应用于白色发光二极管。
Abstract
A range of Sr3P4O13:Ce
3+,Tb
3+ phosphors were prepared via a high temperature solid-state reaction method, and their phase compositions, particle morphologies, and luminescence properties were systematically studied by the X-ray diffractometry, scanning electron microscopy, and fluorescence spectroscopy. The results show that there is an overlap at 300-400 nm between the emission spectra of Sr3P4O13:Ce
3+ and excitation spectra of Sr3P4O13:Tb
3+. Under near-ultraviolet excitation (290 nm), the phosphors emit blue light (approximately 300-420 nm) for Ce
3+and yellow or green light (approximately 480-500 and 530-560 nm) for Tb
3+. When the mole fraction of Ce
3+is 0.08 and the mole fraction of Tb
3+ increases from 0.01 to 0.09, the 4f→5d electronic transition of Ce
3+ transfers energy to the
5D3 and
5D4 levels of Tb
3+, decreasing the luminescence intensity of Ce
3+ and gradually increasing the luminescence intensity of Tb
3+. This proves that Ce
3+→Tb
3+ energy transfer occurs in the Sr3P4O13 host. Therefore, the Ce
3+→Tb
3+ energy transfer mechanism is studied, and it is found that when the mole fraction of Tb
3+ is 0.09, the energy transfer efficiency reaches its highest value (86.46%). The corresponding color coordinates of Sr2.61P4O13:0.24Ce
3+,0.15Tb
3+ are in the green region; thus, Sr3P4O13∶Ce
3+,Tb
3+ co-doped phosphors are expected to be promising green fluorescent materials.
糜万鑫, 曹丽丽, 楚司祺, 马红萍. 绿色荧光粉Sr3P4O13∶Ce 3+,Tb 3+的发光特性及Ce 3+→Tb 3+能量传递机理 [J]. 光学学报, 2019, 39(8): 0816002. Wanxin Mi, Lili Cao, Siqi Chu, Hongping Ma. Luminescence Properties and Energy Transfer Mechanism of Sr3P4O13∶Ce 3+,Tb 3+ Green Phosphors [J]. Acta Optica Sinica, 2019, 39(8): 0816002.