采用机械力化学-喷雾干燥技术制备球形YAG∶Ce粉体.通过XRD、SEM和荧光光谱等分析方法,研究焙烧温度、混悬液浓度、Ce3+掺杂量对粉体的形貌、粒度及发光性能的影响.结果表明,YAG∶Ce前驱体为球形,粒径分布在2～10μm之间,经1300℃焙烧处理,形貌由毛团状转变为米团状.焙烧温度超过900℃时,形成YAG单相,并随着温度升高晶粒尺寸增大.随着混悬液浓度的增加,粉体尺寸明显增大,相应的发光性能先增大后减小,当浓度达到0.2mol/L时,发光性能最佳,是由于其不同的光学性能造成的.随着Ce3+掺杂量x增加,粉体的发光强度先增大后减小,当x=0.06时,达到最大值,粉体的发射光波长先红移后蓝移；当x=0.1时,红移达最大值.由于电多极的相互作用,产生Ce3+浓度淬灭效应,其能量传递的临界距离Rc≈1.9nm.
参考文献
| [1] | Lin C C;Liu R S .Advances in phosphors for light-emit-ting diodes[J].J Phys Chem Lett,2011,2:1268-1277. |
| [2] | Zhongyuan Liu;Sheng Liu;Kai Wang;Xiaobing Luo .Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging[J].Applied optics,2010(2):247-257. |
| [3] | Yang H;Yuan L;Zhu G et al.Luminescent properties of YAG:Ce3+ phosphor powders prepared by hydrothermal-homogeneous precipitation method[J].Materials Letters,2009,63:2271-2273. |
| [4] | 胡文远,杨定明,刘勋,张铁军.机械力固相化学反应法制备纳米氧化锌基红色荧光粉[J].发光学报,2007(06):919-922. |
| [5] | Zong-Yuan Liu .Effects of YAG: Ce Phosphor Particle Size on Luminous Flux and Angular Color Uniformity of Phosphor-Converted White LEDs[J].Journal of display technology,2012(6):329-335. |
| [6] | Xianqing Piao;Ken-ichi Machida;Takashi Horikawa .Preparation of CaAlSiN3:Eu~(2+)Phosphors by the Self-Propagating High-Temperature Synthesis and Their Luminescent Properties[J].Chemistry of Materials,2007(18):4592-4599. |
| [7] | Dexter D L .A theory of sensitized luminescence in solids[J].Chemical Physics,1953,21(05):836-850. |
| [8] | Blasse G .Energy transfer in oxiidic phosphors[J].Philips Research Reports,1969,24:131-144. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%