溶胶-燃烧法合成稀土掺杂氧化物纳米晶及发光性能
文献类型：学位论文
| 作者 | 夏国栋 |
| 学位类别 | 博士 |
| 答辩日期 | 2006 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 周圣明 |
| 关键词 | 纳米 稀土掺杂 发光 荧光粉 |
| 其他题名 | Sol-combustion synthesis and luminescence property of rare earth doped oxide nanocrystals |
| 中文摘要 | 本文采用溶胶-燃烧法成功制备了系列稀土掺杂Y3Al5O12(YAG)荧光材料。900℃退火后得到纯相YAG。该温度比传统的固相反应法低700℃，特别适合于纳米粉体的合成。在YAG的相变过程中未出现YAlO3 (YAP)和Y4Al2O9 (YAM)中间相。 YAG:Tb3+荧光材料的主发射峰为546nm处的5D4→7F5跃迁发射，为绿色荧光。YAG:Ce3+荧光粉的发射峰在530nm附近，属于黄绿光，为合成白光LED提供了基础。同时合成了YAG:Ce3+,Li+荧光粉, 首次发现YAG:Ce3+,Li+荧光粉的发光强度较YAG:Ce3+的显著增强，为改善LED 发光效率提供了一种方法。 YAG:Eu3+荧光粉的发射峰以处于591 nm的5D0→7F1橙光发射带为主。在800℃合成了纯相YAM:Eu3+荧光材料，不仅出现了590 nm左右的橙光发射，并且出现了610 nm左右的红光发射。YAM:Eu3+的发光来源于两个发光中心。 通过改变柠檬酸燃料的用量，可以直接合成纳米晶，避免了通常的高温退火。首次采用柠檬酸溶胶-燃烧法成功地制备了Y2O3:Eu3+纳米荧光材料，其粒径在30-50nm之间。Y2O3:Eu3+荧光材料的发射光谱，主峰在612 nm，是纯正的红色荧光。与体材料相比，纳米晶发射峰有明显蓝移。 同样采用柠檬酸溶胶-燃烧法首次制备了立方相的Gd2O3:Eu3+纳米荧光材料，避免了通常的高温退火。Gd2O3:Eu3+荧光材料的发射光谱和Y2O3:Eu3+的相同，其发射强度接近Y2O3:Eu3+商用荧光粉的发光强度，两者比值为80%左右。 |
| 英文摘要 | In this paper, rare earth doped Y3Al5O12(YAG) phosphors have been successfully synthesized by sol-combustion method. The pure YAG phase can be obtained at 900℃, which is lower 700℃ than conventional solid state method. In the formation of YAG phase, no intermediate phases such as YAlO3(YAP) and Y4Al2O9(YAM) were detected. The main emission peak of YAG:Tb3+ nanocrystals is at 546nm, corresponding to 5D4→7F5 transition. The emission peak of YAG:Ce3+ nanocrystals is at 530nm, which makes it possible for the phosphors to apply with blue LED. It is found that the luminescence intensity of YAG:Ce3+,Li+ is much higher than that of YAG:Ce3+ at the same conditions. The emission peak of YAG:Eu3+ nanocrystals is mainly at 591nm, 5D0→7F1 orange emission. The Y4Al2O9:Eu3+ phase can form through sintering at 800 ℃. The emission spectra consist of orange emission at 590nm and red emission at 610 nm, which derived from two luminescence centers. At the basis of above work, Y2O3:Eu3+ and Gd2O3:Eu3+ nanocrystals have also been synthesized through the sol-combustion method. High temperature sintering can be avoided through changing amount of citric acid. Y2O3:Eu3+ nanocrystals have been synthesized for the first time through combustion method. The average grain size of the phosphor was about 30-50 nm. The emission peak of Y2O3:Eu3+ nanocrystals locates about 612 nm. In contrast with bulk, emission peak of Y2O3:Eu3+ nanocrystals shows blue shift. At the same time, cubic Gd2O3:Eu3+ nanocrystals have also been synthesized through the sol-combustion method without high temperature sintering. The emission spectrum of Gd2O3:Eu3+ is similar to that of Y2O3:Eu3+. The emission intensity of combusted Gd2O3:Eu3+ nanocrystals are close to commercial Y2O3:Eu3+ phosphors. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15600]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 夏国栋. 溶胶-燃烧法合成稀土掺杂氧化物纳米晶及发光性能[D]. 中国科学院上海光学精密机械研究所. 2006. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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