金属离子掺杂YAG荧光粉制备及性能研究

摘要掺铈钇铝石榴石（YAG:Ce3+）是用作商业白光LED的主流荧光粉，YAG的大规模生产工艺主要是高温固相法，它技术成熟，工艺流程简单，花费成本相对较低，但是这种方法加热温度高而且加热时间长，耗能严重。为降低高温固相法能耗，本论文采用混合助熔剂硼酸H3BO3、氟化钠NaF、碳酸钙CaCO3，研究了助熔剂种类、添加量、掺杂铈离子浓度、烧结温度和烧结时间对产物物相、粒径和性能影响。结果表明：随着烧结温度升高和烧结时间延长，样品衍射峰强度提高；随着助熔剂H3BO3、NaF、CaCO3含量的提高，样品衍射峰强度提高，杂相减少，粒径分布范围减小，在H3BO3含量增加到1%、NaF含量增加到0.6%、CaCO3含量增加到0.2%以后获得纯相样品；在H3BO3含量1%、NaF含量1%、CaCO3含量0.5%、铈离子浓度0.06mol%、烧结温度1500℃、烧结时间6小时的条件下，获得结晶度较好的纯相样品，样品的XRD衍射峰强度最高，粒径分布范围最小，发光性能最好。采用添加混合助熔剂的方法能有效降低高温固相法能耗。70156

毕业论文关键词: 发光二极管；钇铝石榴石；高温固相法；助熔剂；发光性能

Abstract

YAG:Ce3+ is one of the main of commercial white LED powder. YAG large-scale production process is mainly high-temperature solid-phase method. It is mature, simple and it’s cost is relatively low. But, the heating temperature this method of is high and the heating time is long, so the energy consumption is serious. In order to reduce the energy consumption of high temperature solid phase method, the effects of flux type, addition amount, cerium ion concentration, sintering temperature and sintering time on the particle size and performances of the product were studied by using mixed solvent of H3BO3, NaF and CaCO3 Phase. The results showed that with the increase of sintering temperature and sintering time, the diffraction intensity of the sample increases. With the increase of the content of H3BO3, NaF and CaCO3, the diffraction intensity of the sample increased, the impurite phase decreased and the particle size range decreased. When the H3BO3 content was up to 1%, NaF content was up to 1%, CaCO3 content was up to 0.2%, the pure phase YAG:Ce3+ was obtained. When the cerium ion concentration was 0.06mol%, the content of H3BO3 increased to 1%, NaF content increased to 1%, CaCO3 content increased to 0.5% with sintering temperature of 1500℃ and sintering time of 6 hours, the XRD diffraction intensity of the sample is highest, the particle size range is smallest and the luminescent performance is best. The method of adding mixed cosolvent can effectively reduce the energy consumption of high temperature solid phase method.

Keywords: LED；YAG；High temperature solid phase method；Flux；Luminous properties

摘要 i

Abstract i

目录 iii

1 绪论 1

1.1 LED的兴起 1

1.2 白光LED灯的优势与应用 2

1.2.1 白光LED的性能与特点 3

1.2.2白光LED的实现途径 4

1.2.2 白光LED的应用 5

1.3 钇铝石榴石（YAG） 6

1.4 掺铈钇铝石榴石（YAG:Ce3+）金属离子掺杂YAG荧光粉制备及性能研究:http://www.youerw.com/cailiao/lunwen_79348.html