稀土离子论文：稀土离子掺杂氟氧化物玻璃陶瓷上转换光致发光的研究

稀土离子论文：稀土离子掺杂氟氧化物玻璃陶瓷上转换光致发光的研究 稀土离子论文:稀土离子掺杂氟氧化物玻璃陶瓷上转换光致发光的研究 【中文摘要】三价稀土离子具有丰富的能级,其掺杂的上转换发光在绿色照明、生物荧光标识、短波长激光器、信息显示以及光电子学等领域有着广泛应用前景。掺杂稀土离子的玻璃陶瓷是目前激光材料领域的研究热点之一。本论文主要研究了Er3+/Yb3+, Tm3+/Yb3+和Tm3+/Er3+/Yb3+掺杂NaYF4玻璃陶瓷的光谱性质与上转换发光机制。用熔融法制备了稀土离子Er3+/Yb3+共掺,Tm3+/Yb3+共掺和Tm3+/Er3+/Yb3+共掺NaYF4玻璃陶瓷。XRD表征玻璃中包含NaYF4纳米晶。在红外激光976 nm激发下,观测了Er3+/Yb3+共掺,Tm3+/Yb3+共掺和Tm3+/Er3+/Yb3+共掺NaYF4玻璃陶瓷的上转换荧光光谱。其中,在Er3+/Yb3+共掺的样品中观察到峰值为668 nm红光(4I9/2?4I15/2),峰值为520 nm(2H11/2?4I15/2)和550 nm(4S3/2?4I15/2)绿光;在Tm3+/Yb3+共掺的样品中观察到475 nm蓝光(1G4?3H6),651 nm红光(1G4?3H4)和790 nm近红外光(3H6?3H4);在 Tm3+/Er3+/Yb3+共掺的样品中同时观察到明亮的蓝光(475 nm),绿光(530 nm和550 nm)和红光(651 nm和668 nm)。红、绿和蓝光光强积分随着掺杂浓度的改变而变化。通过对光谱和功率曲线的,根据能级匹配条件及Er3+, Tm3+和Yb3+能级图解释了发光机制,475 nm和651 nm荧光发射主要是三光子过程,520 nm, 550 nm, 668 nm 和790nm荧光发射主要是双光子过程。根据吸收光谱,利用 Judd-Oflet理论计算了Er3+和Tm3+的J-O强度参数Ωλ,Ωλ可以 定量地表示发光强度的大小。计算得到的样品中Er3+和Tm3+发光强 度数值的变化规律与实验结果相吻合。 【英文摘要】The trivalent ions of rare earth have abundant energy evels. Rare-earth ion doped upconversion luminescent materials exhibit a wide range of potential applications in environmental-friendly lighting, fluorescent labels for biomolecules, shortwave laser, information display and photoelectron, etc. Nowadays the rare-earth doped glass ceramics become a hotspot. In this paper, we study the spectrum properties and the upconversion luminescent mechanism of NaYF4 glasse ceramics doping Er3+/Yb3+, Tm3+/Yb3+ and Tm3+/Er3+/Yb3+.A series of samples of Er3+/Yb3+ co-doped, Tm3+/Yb3+ co-doped and Tm3+/ Er3+/Yb3+ co-doped NaYF4 galss ceramics with different concentration were prepared by high-temperature melting, respectively. The formation of NaYF4 nanocrystals was confirmed by X-ray diffraction in the glass ceramics.Upconversion fluorescence emission spectra of the samples of Er3+/Yb3+ co-doped, Tm3+/Yb3+ co-doped and Tm3+/ Er3+/Yb3+ co-doped NaYF4 galss ceramics under 976 nm excitation were measured. 668 nm red (4I9/2?4I15/2) , 520 nm green (2H11/2?4I15/2) and 550 nm green (4S3/2?4I15/2) emissions were observed in the samples of Er3+/Yb3+ co-doped. 475 nm blue (1G4?3H6), 651 nm red (1G4?3H4) and 790 nm near infrared (3H6?3H4) emissions were observed in the samples of Tm3+/Yb3+ co-doped. Intense blue (476 nm), green (520 and 550 nm) and red (651 and 668 nm) emissions were simultaneously observed in the samples of Tm3+/ Er3+/Yb3+ co-doped. Red, green and blue light integral intensity changes with the diversification of doped concentration. Luminous mechanism has been explored according to the energy level matching and level scheme of Er3+, Tm3+ and Yb3+ on the basis of spectra and power dependence. The emissions of 475 nm and 651 were mainly three-photon process. The emissions of 520 nm, 550 nm, 668 nm and 790 nm were mainly two-photon process.According to the absorption spectra, the J-O intensity parameters ?λof Er3+ and Tm3+ were calculated based on Judd-Ofelt theory. The value of luminous intensity depends on the value of ?λ. The diversification of Er3+ and Tm3+ luminous intensity by calculation was consistent with experimental results in the samples. 【关键词】稀土离子 上转换发光 玻璃陶瓷 NaYF4 【备注】索购全文在线加好友:1.3.9.9.3.8848 同时提供论文写作一对一指导和论文发表委托服务 【英文关键词】rare-earth ions upconversion luminescence glasse ceramics NaYF4 【目录】稀土离子掺杂氟氧化物玻璃陶瓷上转换光致发光的研究 摘要 4-5 Abstract 5 第一章 绪论 9-20 1.1 稀土离子掺杂的上转换发光材料的研究历史及现状 9-11 1.1.1 稀土元素的简介 9-10 1.1.2 稀土离子掺 杂的上转换发光材料的研究历史及现状 10-11 1.2 稀土离子 的上转换发光现象及机理 11-14 1.2.1 激发态吸收 (ESA) 11-12 1.2.2 能量传递(ET) 12-14 1.2.3 光子 雪崩(PA) 14 1.3 上转换的发光效率 14-15 1.4 玻璃陶 瓷 15-17 1.4.1 玻璃陶瓷简介 15-16 1.4.2 稀土离子 掺杂氟氧化物玻璃陶瓷的概述及研究进展 16-17 1.5 熔融法 制备玻璃陶瓷的工艺过程 17-18 1.5.1 玻璃的制备过程 17 1.5.2 玻璃的微晶化处理过程 17-18 1.6 本文的工 作 18-20 1.6.1 研究的目的和意义 18-19 1.6.2 本文 的主要内容 19-20 第二章 稀土离子掺杂NaYF_4玻璃陶瓷的 制备与发光特性 20-34 2.1 引言 20 2.2 稀土离子掺杂 NaYF_4 玻璃陶瓷的制备和光学测量 20-28 2.2.1 Er~(3+), Er~(3+)/Yb~(3+)和Tm~(3+)/ Yb~(3+)掺杂NaYF_4 玻璃陶瓷的制备 20-22 2.2.2 NaYF_4 玻璃陶瓷的微观结构的表征 22-23 2.2.3 吸收光谱的测量 23-25 2.2.4 Er~(3+)/Yb~(3+)和Tm~(3+)/Yb~(3+)共掺NaYF_4 玻璃陶瓷的光致 发光现象 25-28 2.3 Er~(3+)/Yb~(3+)和Tm~(3+)/Yb~(~(3+))共掺NaYF_4 玻璃陶瓷的上转换发光机制 28-32 2.4 本章小结 32-34 第三章 Tm~(3+)/Er~(3+)/Yb~(3+)共掺NaYF_4玻璃陶 瓷的发光特性 34-43 3.1 引言 34 3.2 样品的制备与光 谱测量 34-37 3.2.1 Tm~(3+) /Er~(3+)/Yb~(3+)掺杂NaYF_4 玻璃陶瓷的制备 34 3.2.2 Tm~(3+) /Er~(3+)/Yb~(3+)掺杂 NaYF_4 玻璃陶瓷的吸收光谱 34-35 3.2.3 Tm~(3+) /Er~(3+)/Yb~(3+)掺杂NaYF_4 玻璃陶瓷的上转换发光光谱 35-37 3.3 Tm~(3+) Er~(3+)/Yb~(3+)共掺NaYF_4 玻璃陶瓷 的上转换发光机制 37-39 3.4 CIE 颜色系统 39-41 3.4.1 CIE 色度学简介 39-40 3.4.2 Tm~(3+) Er~(3+)/Yb~(3+)共掺NaYF_4 玻璃陶瓷光致荧光的匹配 40-41 3.5 本章小结 41-43 第四章 Judd-Ofelt 理论 分析 43-48 4.1 引言 43 4.2 Judd-Ofelt 理论简介 43-45 4.3 Er~(3+)和Tm~(3+)光学性质的J-O 计算 45-47 4.4 本章小结 47-48 第五章 48-50 参考文献 50-55 攻读硕士学位期间发表的学术论文 55-56 致谢 56-57