【作者】 郝海涛；

【导师】 周禾丰；

【作者基本信息】 太原理工大学 ， 材料学， 2006， 硕士

【摘要】 白光LED具有耗电量小、寿命长、环保、响应速度快等优点。随着发光效率的提高和生产成本的降低，白光LED预计必将成为继白炽灯、荧光灯、高强度放电灯后的新一代照明光源。半导体照明将成为21世纪最具发展前景的高新技术领域。实现半导体白光照明的主要途径有以下两种：一是利用红、绿和蓝三基色的半导体LED芯片组合来实现白光照明；二是在超高亮度GaN基蓝、绿和紫外LED芯片上涂敷相应组分的荧光物质来实现白光照明，这类荧光物质就是白光LED用荧光材料。 本文以白光LED用荧光材料为研究对象，采用高能球磨与反应烧结法、共沉淀法合成了应用最广泛白光LED用荧光材料——钇铝石榴石(Y₃Al₅O₁₂，简称YAG)荧光粉，并用荧光转换法制备了性能优良的白光LED。 采用X射线衍射仪对粉末样品的物相结构进行分析：采用荧光光谱仪测试了样品的激发光谱和发射光谱；采用场发射扫描电子显微镜对样品的微观结构和形貌进行表征，测试了样品的能量散射谱；并采用粒度仪测试了样品的粒度分布。 大量的实验结果表明：①、采用高能球磨和反应烧结相结合的方法，在1300℃反应6h得到了单一物相的、发光性能良好的YAG荧光粉，产物颗粒尺寸分布均匀，无团聚，近似呈球形，平均粒度在2μm左右；加入适量助熔剂有助于合成发光性能好的YAG荧光粉，且不会引入杂相：采用共沉淀法在900℃获得了纳米级的YAG荧光粉，但其团聚现象严重，发光亮度偏低。②、YAG：Ce³⁺荧光粉的激发光谱为双峰结构，两主峰位更多还原

【Abstract】 White-light light emitting diodes（LED） possesses such excellent performance as low power consumption, long lifetime, environmental protection and fast response time, and so on. Along with increasing of LED luminous efficiency and declining of manufacture costs, it is forecasted that white-light LED will become the new generation lighting and replace incandescent lamp, fluorescent lamp and high intensity discharge lamp and other types of lamp. In the 21st century, white-light Semiconductor lighting will become the high and new technology that possesses great developmental potential. Semiconductor lighting realized white-light emitting by using combination of red-light LED chip, green-light LED chip and blue-light LED chip, or coating fluorescent materials on high brightness GaN-based blue-light chip or ultraviolet-light chip. Wherein, these fluorescence materials are named white-light LED-used fluorescence materials.In this paper, white-light LED blue conversion materials used widely, which are Yttrium Aluminum Garnet phosphor（Y₃Al₅Oi₂, simply called YAG）, were synthesized by combination of high-energy ball milling and reactive更多还原