采用传统高温固相法在较低温度下制备Sm3+离子掺杂Sr3MgSi2O8橙红色荧光粉,研究了Sr3-xMgSi2O8:x% Sm3+的晶体结构和发光性能。激发和发射光谱表明,样品可被近紫外350～420nm波段激发,最强激发峰位于402nm处,发射光谱呈现出Sm3+的特征橙红色,谱带峰值分别在563nm、601nm、644nm,对应于 4G5/2→6H5/2、4G5/2→6H7/2和 4G5/2→6H9/2特征跃迁。最强发射对应的掺杂浓度为5%(摩尔分数,下同),浓度猝灭的发生主要是因为非辐射荧光粉中Sm3+离子之间的能量转移。浓度为5%的CIE坐标为(0.5548,0.4366)最接近橙红色,获得极佳的演色性。样品Sr3-xMgSi2O8:x% Sm3+荧光粉是一种具有应用潜力的近紫外激发三基色白光LED用橙红色荧光粉。
The Sm3+ ion-doped Sr3MgSi2O8 orange-red phosphor was prepared at a lower temperature by conventional high-temperature solid-phase method.The crystal structure and luminescence properties of Sr3-xMgSi2O8:x% Sm3+ were studied.The excitation and emission spectra shown that the sample can be excited by the near-ultraviolet 350～420nm band,and the strongest excitation peak was located at 402nm.The emission spectrum exhibited characteristic orange-red emission of Sm3+,and the peak positions of the bands were at 563nm,601nm and 644nm.Corresponding to 4G5/2→6H5/2,4G5/2→6H7/2 and 4G5/2→6H9/2 characteristic transitions,respectively.The results shown that the doping concentration corresponding to the strongest emission was 5%,and the CIE coordinate was (0.5548,0.4366),which was closest to orange-red color,and obtained a lower color temperature and excellent color rendering.The sample Sr3-xMgSi2O8:x% Sm3+ phosphor was an orange-red phosphor for near-ultraviolet excitation trichromatic white LED with potential application.
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