稀土离子掺杂YAG、Y<sub>2</sub>O>sub>3</sub>透明陶瓷制备及性能研究
文献类型：学位论文
| 作者 | 林辉 |
| 学位类别 | 博士 |
| 答辩日期 | 2010 |
| 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 | 透明陶瓷 光谱性能 激光性能 显微结构 下转换近红外发光 能量转移 |
| 其他题名 | Preparation and properties of rare earth ions doped YAG, Y2O3 transparent ceramics |
| 中文摘要 | 激光陶瓷是透明陶瓷领域的一个重要分支，其在高功率固体激光武器、惯性约束聚变方面均具有重要应用前景；另一方面，透明陶瓷的高光学透过率本身使其具备了一个不同于传统不透明荧光材料的新性能。另外，透明陶瓷良好的物化稳定性及抗辐照等性能使其成为一种很有潜力的发光基质材料，如用于半导体照明荧光材料的Ce:YAG透明陶瓷等。 本文着眼于激光陶瓷和透明发光陶瓷，系统研究了Nd3+、Yb3+、Tm3+离子掺杂YAG和Y2O3激光陶瓷的制备工艺、显微结构、光谱与激光性能；同时在基于YAG、Y2O3透明陶瓷基质的下转换近红外发光方面也进行了多个系列的材料制备，并对其光谱、下转换近红外发光性能及施主-受主间的能量转移机理进行了研究，主要包括如下几个方面的内容： 第一部分 稀土离子掺杂YAG、Y2O3激光陶瓷制备及其性能研究 激光陶瓷由于其相比单晶和玻璃的诸多优点使得其很有可能成为下一代固体激光工作物质。本部分以Nd:YAG、Yb:YAG、Yb: Y2O3、Tm: Y2O3为研究对象，主要研究了： 1） 湿法球磨制备透明陶瓷粉体，单轴干压-冷等静压成型，真空烧结制备1at%Nd:YAG透明陶瓷的工艺，主要包括保温温度、升温速率、添加剂种类、添加剂TEOS的加入量、球磨烘干后粉末是否过筛、保温时间等因素对真空烧结所得透明陶瓷样品的光学性能、显微结构的影响； 2） 测试并研究了优化工艺下制备的1at%Nd:YAG透明陶瓷样品的热膨胀和热导率等热学性能，并与其他工作同类透明陶瓷样品的热学性能进行了比较；对该样品进行了激光实验，实现了最大平均功率为2 W的连续激光输出，阈值0.899 W，斜率效率为10.2%。 3） 制备了Nd3+离子高浓度掺杂（3at%, 5at%, 7at%, 9at%）的YAG透明陶瓷，并研究了其光谱性能； 4）在1at%Nd:YAG的制备工艺基础上，制备了8at%Yb:YAG透明陶瓷，研究了其光学性能、显微结构，计算了其激光性能相关的光谱参数； 5）制备了Φ-140 mm的Yb:Y2O3大尺寸透明陶瓷，并对其光谱性能、显微结构和热导率进行表征分析，计算了其激光性能相关的光谱参数； 6）制备了用于输出中红外2 μm激光的Tm:Y2O3透明陶瓷，对其物相、光谱及显微结构等性能进行了表征，计算了其激光性能相关的光谱参数。 第二部分 下转换近红外发光透明陶瓷制备及发光性能、能量转移机理研究 近年来，近红外量子裁剪（即由紫外-可见到近红外的下转换发光）在减弱硅太阳能电池载流子热化效应并提高其转化效率方面的潜在应用引起了人们很高的研究兴趣。本部分以稀土离子（RE3+）/Yb3+共掺的Y2O3、YAG透明陶瓷为研究对象，主要进行了以下研究： 1） 制备了Tm3+/Yb3+共掺Y2O3、Tb3+/Yb3+共掺Y2O3、Pr3+/Yb3+共掺Y2O3和Ce3+/Yb3+共掺YAG透明陶瓷材料 2） 对上述各系列材料的物相、光学透过率、显微结构进行了表征分析； 3） 通过激发、发射光谱、荧光寿命曲线等光谱测试实现了由可见到近红外的下转换发光，并验证了施主-受主间能量转移过程的存在； 4） 结合光谱测试，对各系列透明陶瓷材料中施主-受主离子间可能的能量转移机制进行了较为全面的讨论，并对在可见光激发下，能量转移过程中的主导机制做了判断。 5） 对各系列透明陶瓷材料的下转换近红外发光性能进行了评估。 关键词：透明陶瓷；光谱性能；激光性能；显微结构；下转换近红外发光；能量转移 |
| 英文摘要 | For the potential application in laser weapons, inertial confinement fusion, etc., laser ceramics are one of the most important branches of transparent ceramics. On the other hand, the high optical transmittance itself gives transparent ceramics an additional property that the conventional luminescent materials do not have. The good physical, chemical stability and the good radioresistance together makes transparent ceramics a very promising luminescent material, for instance, Ce:YAG transparent ceramic phosphor for the LED white luminescence. This paper focused on the laser ceramics and transparent luminescent ceramics. the preparing craft, microscopic structure, optical and spectral properties of the Nd3+, Yb3+, Tm3+ doped YAG and Y2O3 laser ceramics were investigated systematically. RE3+ (trivalent rare earth ions)/Yb3+ co-doped YAG and Y2O3 transparent ceramics were prepared and the down-conversion near infrared (NIR) luminescence has been achieved. The energy transfer mechanisms between the donors and the acceptors and the efficiency of the down-converion NIR luminescence were analyzed. The main contents of this paper are as follows, Part Ⅰ Preparation and properties of rare earth doped YAG, Y2O3 laser ceramics For their advantages compared with single crystals and glasses, laser ceramics are very promising materials to be the next generation laser gain media. In this part, the preparing craft and properties of Nd:YAG, Yb:YAG, Yb: Y2O3, Tm: Y2O3 laser ceramics were investigated, including： 1） Factors impact the optical quality and the microscopic structure of the transparent ceramics in the preparing process have been investigated, such as the holding temperatures, temperature ramping rates, addivitives, contents of TEOS as the additive, and holding time, etc. 2） The thermal expansion and thermal conductivity coefficients of the 1at%Nd:YAG transparent ceramic sample were characterized and were compared with the high quality corresponding transparent ceramic sample in other literatures. CW laser experiment was performed for the 1at%Nd:YAG sample. The maximum output power was 2 W. The threshold was 0.899 W and the slope efficiency was 10.2%. 3） Nd3+ heavy doped (3at%, 5at%, 7at% and 9at%) YAG transparent ceramic samples were prepared and their optical properties were investigated. 4） Based on the optimal preparing parameters of the 1at%Nd:YAG transparent ceramics, 8at%Yb:YAG transparent ceramic sample was prepared. The optical property and the microscopic structure were studied. Parameters related to the laser property were calculated. 5）Large-size Φ-140 mm Yb:Y2O3 transparent ceramic samples were prepared.The impact of the cooling rate on obtaining crack-free samples was studied. The optical, spectral properties, microscopic structure and the thermal conductivity coefficient of the crack-free sample were also investigated. Parameters related to the laser property were calculated. 6）Tm:Y2O3 transparent cemics for 2 μm laser were prepared. The phase purity, spectral properties and microscopic structure were characterized. Parameters related to the laser property were calculated. Part Ⅱ Down-conversion near infrared luminescence and its energy transfer mechanisms in RE3+/Yb3+ co-doped YAG, Y2O3 transparent ceramics In recent years, near infrared quantum cutting (namely, the down-conversion near infrared luminescence) has attracted much interest for its potential application in reducing the thermalization of the charge carriers and enhancing the conversion efficiency of crystalline silicon solar cells. This part mainly focused on the（RE3+）/Yb3+ codoped Y2O3 and YAG transparent ceramics and the down-conversion near infrared luminescence has been demonstrated. The energy transfer mechanisms between the donors and acceptors have been discussed intensively. The details are as follows, 1) Tm3+/Yb3+ codoped Y2O3, Tb3+/Yb3+ codoped Y2O3, Pr3+/Yb3+ codoped Y2O3 and Ce3+/Yb3+ codoped YAG transparent ceramic samples were prepared. 2) The optical transmittance and microscopic structure of the above materials were characterized and analyzed. 3) Down-conversion near infrared luminescence was achieved and the energy transfer process was proved by the excitation, emission spectra and luminescence decay curves. 4) Based on the spectra characterization, the energy transfer mechanisms between the donors and the acceptors in the different series of transparent ceramics were dicussed thoroughly. The dominant energy transfer mechanism was determined. 5) The down conversion luminescence ability of the above several serials of transparent ceramics was evaluated. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15645]  |
| 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 | 林辉. 稀土离子掺杂YAG、Y<sub>2</sub>O>sub>3</sub>透明陶瓷制备及性能研究[D]. 中国科学院上海光学精密机械研究所. 2010. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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