液相混合辅助低温制备Ca2Si5N8:Eu^2+荧光粉

Preparation of Ca2Si5N8:Eu2+ Phosphor by Low Temperature Assisted by Liquid Phase Mixing

采用液氨介质溶解原料金属Ca、Eu形成金属‐氨溶液，原料非晶硅悬浮于溶液中，通过液氨挥发使金属‐氨溶液产生过饱和，并以金属酰胺形式沉析在非晶硅表面，将这种液相混合处理的原料在常压1100℃保温6 h合成Ca2 Si5 N8：Eu2＋荧光粉。采用XRD、SEM和PL光谱仪分别表征了产物的晶体结构、微观颗粒形貌以及发光性能。结果表明：这种液相混合降低了荧光粉合成温度，在常压下1100℃保温6 h合成了结晶良好的Ca2 Si5 N8：Eu2＋荧光粉；合成的荧光粉颗粒呈类球形且分散性较好；合成的Ca2 Si5 N8：Eu2＋荧光粉激发峰为467 nm ，发射峰位于580 nm。

Metal Ca and Eu were dissolved in liquid ammonia to form a metal amide solution ,in which amorphous material was suspended .By the volatilization of ammonia ,the metal ammonia solution became supersaturated ,and precipitated on the surface of amorphous silicon in the form of metal amide .Such raw material treated with liquidphase could synthesize Ca2 Si5 N8 ：Eu2＋ phosphor at atmospheric pressure 1100 ℃ for 6 h .X‐ray diffraction （XRD） ,scanning electron microscope （SEM ） and Photoluminescence （PL ） spectroscopy were used to characterize the crystal structure , morphology and light‐emitting properties of the product , respectively . The results show that the liquid phase mixing reduces the synthesis temperature of the phosphor . Finely crystallized Ca2 Si5 N8 ：Eu2＋ phosphor is prepared at atmospheric pressure 1 100℃ for 6 h . The synthesized phosphor is spherical with good dispersion . Excitation peak of Ca2 Si5 N8 ：Eu2＋ phosphor is at 467 nm ,and the emission peak is at 580 nm .