H3BO3对BaAl2Si2O8：Eu2+蓝色荧光粉物相组成和发光特性的影响

采用化学共沉淀法一次煅烧工艺合成了BaAl₂Si₂O₈：Eu²⁺蓝色荧光粉.用X射线衍射仪、荧光分光光度计和扫描电镜测试了助熔剂H₃BO₃对BaAl₂Si₂O₈：Eu²⁺蓝色荧光粉物相结构、发光性能、形貌等的影响.研究表明：化学共沉淀法一次煅烧工艺合成的BaAl₂Si₂O₈：Eu²⁺蓝色荧光粉为单相，H₃BO₃的加入使基质结构由六方相转变成单斜相，并引起发射主峰位置和发射强度的变化；BaAl₂Si₂O₈：Eu²⁺蓝色荧光粉的发光强度随着H₃BO₃加入量的增加先增强，后减弱，当加入H₃BO₃的质量分数为1.5%时，发光强度最大；H₃BO₃的加入使合成BaAl₂Si₂O₈：Eu²⁺蓝色荧光粉的颗粒呈类球形，分布更加均匀，粒度更小. 关键词： 3BO₃')" href="#">H₃BO₃ 2Si₂O₈：Eu²⁺')" href="#">BaAl₂Si₂O₈：Eu²⁺ 发光特性 化学共沉淀法

Effect of H3 BO3 on composition and luminescence properties of BaAl2Si2O8 : Eu2+ blue phosphor

The Eu²⁺ activated blue emitting BaAl₂Si₂O₈：Eu²⁺ phosphor was synthesized by one-step calcination process of precursor prepared with chemical coprecipitation. X-ray diffraction （XRD），fluorescence spectrophotometry and scanning electron microscopy were used to investigate the structure，luminescent property and morphology of the BaAl₂Si₂O₈：Eu²⁺ blue phosphor. The results showed that BaAl₂Si₂O₈：Eu²⁺ phosphor synthesized by the process was pure. The crystal structure of BaAl₂Si₂O₈ transformed from hexagonal structure to monoclinic structure after precursor doping H₃BO₃，which changed the emission peak and luminescence intensity of BaAl₂Si₂O₈：Eu²⁺ phosphor. The luminescence intensity firstly increased with H₃BO₃ doping concentration increasing，then decreased. The optimum mass fraction of H₃BO₃ is about 1.5%. The use of H₃BO₃ as flux could help the phosphor to crystallize，thus enhance the intensities of the excitation and emission spectra of BaAl₂Si₂O₈：Eu²⁺ phosphor，improve the morphology of particles，and endow them with round edges，smooth surfaces and nearly spherical shapes.