Luminescent Properties of Sr_(3-x)Si_(1-x)Al_xO_5:xCe--(3+) Phosphors Prepared by Heterogeneous Precipitation Method

采用非均相沉淀法制备了Sr3-XSI1-XAlXO5∶XCE3+荧光粉,并与高温固相法制备的该荧光粉进行了对比。以Xrd、SEM和荧光光谱分析来表征所制备的荧光粉。结果表明,非均相沉淀法比高温固相反应法制备的荧光粉相纯度更高,颗粒分布更窄,晶面清晰,团聚程度小,相对发光强度也更高。荧光粉的激发光谱为270~500 nM的双峰宽带,最强激发峰位于417 nM处。发射光谱为450~700 nM的单峰宽带,峰值位于525nM处。电荷补偿剂对荧光粉相对发光强度影响较大,外加Al3+置换SI4+作为电荷补偿剂比外加lI+置换Sr2+的效果更好。Phosphors of nominal composition Sr3-xSi1-xAlxO5∶xCe3+ were prepared by heterogeneous precipitation method and high temperature solid state reaction method,respectively.The phosphors were characterized by XRD,SEM and fluorescence spectrum analysis.The results show that phosphors synthesized by heterogeneous precipitation method have higher phase purity,narrower particle size distribution,clearer crystal surface and lighter aggregation,also yield higher relative luminous intensity,than those by high temperature solid state reaction method.The excitation spectra of the phosphors range from 270 nm to 500 nm with the bimodal broadband,while the strongest excitation peak at 417 nm.The emission spectra range from 450 nm to 700 nm with single-peak broadband,with peak at 525 nm.Charge compensation has a great influence on the relative luminous intensity of phosphors.It could be conclude that adding Al3+ to substitute Si4+ as charge compensation might be better than adding Li+ to substitute Sr2+.福建省科技重大专项(2005HZ02-2);福建省重大平台建设基金(2006L2003)资助项

非均相沉淀法制备的Sr_(3-x)Si_(1-x)Al_xO_5:xCe~(3+)荧光粉及其发光性能

采用非均相沉淀法制备了Sr3-xSi1-xAlxO5∶xCe3+荧光粉,并与高温固相法制备的该荧光粉进行了对比。以XRD、SEM和荧光光谱分析来表征所制备的荧光粉。结果表明,非均相沉淀法比高温固相反应法制备的荧光粉相纯度更高,颗粒分布更窄,晶面清晰,团聚程度小,相对发光强度也更高。荧光粉的激发光谱为270～500 nm的双峰宽带,最强激发峰位于417 nm处。发射光谱为450～700 nm的单峰宽带,峰值位于525nm处。电荷补偿剂对荧光粉相对发光强度影响较大,外加Al3+置换Si4+作为电荷补偿剂比外加Li+置换Sr2+的效果更好

YAG荧光粉-无铅低软化温度玻璃复合浆料的制备与应用

为优化大功率白光LED的封装过程,提出将YAG荧光粉-无铅低软化温度玻璃复合浆料印刷在玻璃基片上,经热处理制备荧光玻璃片的技术方案。采用热膨胀仪、粉末衍射仪、热重分析仪、荧光光谱仪等研究无铅低软化温度玻璃成分与热学性能的关系,无铅低软化温度玻璃粉与YAG荧光粉的配比、固含量、热处理制度等因素对复合浆料及荧光玻璃片晶型、粘度及发光等性能的影响。结果表明,复合浆料固含量为70%时,粘度适用于丝网印刷;印刷后的玻璃基片在550~650℃温度下进行热处理,可制得荧光玻璃片;无铅低软化温度玻璃与YAG荧光粉质量比在1. 2~4. 0范围调整,可得到封装后色温在3500~7000 K的荧光玻璃片。该荧光玻璃片可适用于大功率白光LED的封装。华侨大学2016年实验教学改革与建设课题(66661601