助熔剂NaF对YAG:Ce荧光粉结构及发光性能影响  

Effect of NaF Flux on Structure and Luminescence of YAG:Ce Phosphor

作　　者：黎学明[1] 孔令峰[1] 李武林[1] 杨文静[1] 

机构地区：[1]重庆大学化学化工学院,重庆400044

出　　处：《无机化学学报》2009年第5期865-868,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.10476035);重庆市自然科学基金重点资助项目(No.2005BA4016)

摘　　要：利用化学共沉淀法,研究氟化钠助熔剂对YAG∶Ce荧光粉结构及发光性能影响。采用XRD分析不同含量氟化钠助熔剂的YAG晶相形成过程,通过SEM和荧光光谱研究氟化钠助熔剂对其发光和形貌影响规律。结果表明,含氟化钠助熔剂的YAG∶Ce荧光粉,合成温度可降低300℃,且不影响YAG晶相形成;随氟化钠添加量增加,荧光粉结晶度增加,发光强度增强;NaF添加量6%为最佳,其颗粒表面呈规则类球状,粒径1μm左右,分布较均匀,氟化钠在荧光粉晶相形成过程中除具有助熔剂作用外,Na+还具有电荷补偿的作用;探讨氟化钠引起荧光粉光致发光峰蓝移的机理。Spherical-like Y3Al5O12：Ce （YAG ：Ce） phosphor powders with good photoluminescence intensities were prepared by co-precipitation containing NaF flux. XRD analysis shows that phase-pure phosphors can be obtained at temperatures about 1 100 ℃ and their crystallization enhance with increasing content of NaF flux. From SEM photographs, as-prepared particles are spherical-like shapes, narrow size distributions with mean size mostly at 1 μm. The optimal photoluminescence intensity of the YAG：Ce phosphor powders were obtained on the condition of containing 6%NaF. Apart from being used as flux in process of phosphor synthesis, Na^＋ ion in NaF is also the charge compensator. In addition, mechanism of photoluminescence peak blue shift for YAG ：Ce phosphor caused by NaF flux is also discussed.

关 键 词：YAG∶Ce3+ 荧光粉 助熔剂 电荷补偿剂 

分 类 号：O614.3[理学—无机化学] O614.332[理学—化学]