硼掺杂对Ca2Si5N8:Eu2+荧光粉发光性能的影响

摘要

采用氨热法,以金属Ca、Eu、非晶Si以及硼烷氨为原料,液氨为介质均与混合,经1230℃保温5 h合成h-BN包覆的Ca2 Si5 N8:Eu2+红色荧光粉.X射线衍射(XRD)测试结果表明:是否掺杂硼并没有改变Ca2 Si5 N8晶体结构,但掺杂硼的产物除存在Ca2 Si5 N8主相外,还包含BN相;透射电子显微镜(T EM)分析结果得到:BN相呈透明状包覆在Ca2 Si5 N8外表面,并与Ca2 Si5 N8相呈共格相界;荧光光谱(PL)测试结果表明:硼掺杂Ca2 Si5 N8:Eu2+荧光粉的发光强度提高了约1.1倍,发射光谱红移20 nm,其激发峰在465 nm,发射峰位于590 nm,硼掺杂有助于提高Ca2 Si5 N8:Eu2+荧光粉的发光性能.%The h-BN-coated Ca2Si5N8 :Eu2+ red phosphor was prepared with ammonothermal method by mixing Ca , Eu , amorphous Si and ammonia borane with the medium liquid ammonia under the temperature of 1230 ℃ for 5 hours .The results of X-ray diffraction(XRD) show that boron doping does not change the crystal structure of Ca2Si5N8 .The boron-doped product not only includes the Ca2Si5N8 principal phase ,but also contains the BN phase .The analysis result of transmission electron microscopy (TEM ) indicates that ,transparent BN phase is covered on the surface of Ca2 Si5 N8 and it also shares a coherent interphase with Ca2Si5N8 .The results of photoluminescence(PL) show that the luminescence intensity of Ca2 Si5 N8 :Eu2+ phosphor doped with B increases by about 1 .1 times and the red shift of the emission spectrum is about 20 nm .Excitation peak of Ca2Si5N8 :Eu2+ phosphor is at 465 nm ,and its emission peak is at 590 nm .Therefore ,boron doping contributes to improving the luminescent property of Ca2 Si5 N8 :Eu2+ phosphors .