用于LED的发光玻璃的制备和性能研究

发布时间：2018-03-25 18:39

本文选题：玻璃　切入点：稀土离子　出处：《齐鲁工业大学》2015年硕士论文

【摘要】：发光二极管(LED)是一种将电能转变为光能的半导体发光器件,具有节能、寿命长、启动时间短、环保、低压安全等特点。LED技术的快速发展引起了人们的普遍关注,现在已成为极具影响力和发展前景的一项高新技术产品。目前,利用LED实现白光的主要方式是荧光粉与LED半导体芯片复合。与荧光粉相比,发光玻璃易加工成各种所需的形状,可以与半导体芯片直接封装而不需要环氧树脂、具有较高的热稳定性、容易实现量产和不存在光圈效应等优点。因此,采用稀土离子掺杂的发光玻璃代替相应的荧光粉,应用于白光LED(W-LED)器件的制备,是具有实际应用意义的。采用熔融冷却法制备了稀土离子Eu3+、Tb3+和Dy3+单掺或者共掺的发光玻璃。采用激发光谱、发射光谱、色温、色坐标和衰减曲线对发光玻璃的发光性能进行了研究；研究了玻璃基质组成对稀土离子发光的影响；探讨了稀土离子之间的能量传递。结果表明,在近紫外光激发下,Eu-、Tb-和Dy-共掺杂硅酸盐玻璃能够实现白光发射,与此同时发射光的颜色可通过改变玻璃的组成和激发光波长进行调控；在Tb3+离子单掺杂玻璃中,通过引入B203可以抑制Tb3+离子的5D3发射；在Eu离子单掺杂氟氧铝硅酸盐玻璃中,存在Eu3+离子到Eu2+离子的还原,在玻璃组成中加入CaF2能够增强还原的效率；在Eu/Tb/Dy共掺杂玻璃中存在从Tb3+离子到Eu3+离子和Dy3+离子到Tb3+离子的能量传递。对于Eu/Tb共掺杂玻璃,发现玻璃组成中引入B203和CaF2能够提高Eu3+离子所处的微环境的对称性,引入的CaF2会在玻璃中形成CaF2晶体同时能够增强Eu3+离子的荧光寿命；Eu/Tb共掺杂铝硅酸盐玻璃能够在紫外光激发下发射白光,并且发光颜色能够通过改变激发光波长和玻璃基质组成进行调控；通过分析荧光光谱和衰减曲线我们可以发现存在着从Tb3+离子到Eu3+离子的能量传递。
[Abstract]:LED (Light emitting Diode) is a kind of semiconductor light-emitting device that converts electric energy into light energy. The rapid development of LED technology with the characteristics of energy saving, long life, short start-up time, environmental protection, low voltage safety and so on, has attracted people's attention. At present, the main way to realize white light by using LED is to combine phosphor with LED semiconductor chip. Compared with phosphor, luminous glass is easy to be processed into various required shapes. It can be directly encapsulated with semiconductor chip without the need of epoxy resin. It has the advantages of high thermal stability, easy to realize mass production and no aperture effect. Therefore, the luminescent glass doped with rare earth ions is used instead of the corresponding phosphor. It is of practical significance to be applied to the preparation of white LEDX W-LED devices. Rare earth ions Eu3 Tb3 and Dy3 doped or co-doped luminescent glasses were prepared by melt cooling method. Excitation spectra, emission spectra, color temperature, The luminescence properties of luminescent glass were studied by color coordinate and decay curve. The effect of glass matrix composition on luminescence of rare earth ions was studied. The energy transfer between rare earth ions was discussed. Eu-Tb- and Dy- co-doped silicate glasses can realize white light emission under near-ultraviolet excitation, and the color of emitting light can be controlled by changing the composition and excitation wavelength of the glass, while in the Tb3 ion mono-doped glass, the color of the emitting light can be adjusted by changing the composition of the glass and the excitation wavelength. The 5D3 emission of Tb3 ion can be inhibited by introducing B203, the reduction of Eu3 ion to Eu2 ion exists in EU ion mono-doped fluoro aluminosilicate glass, and the efficiency of reduction can be enhanced by adding CaF2 to the glass composition. There is energy transfer from Tb3 ion to Eu3 ion and Dy3 ion to Tb3 ion in Eu/Tb/Dy co-doped glass. For Eu/Tb co-doped glass, it is found that the introduction of B203 and CaF2 into the glass composition can improve the symmetry of the microenvironment in which Eu3 ion is located. The introduction of CaF2 can form CaF2 crystals in the glass and enhance the fluorescence lifetime of Eu3 ions. EU / TB co-doped aluminosilicate glasses can emit white light under UV excitation. The luminous color can be regulated by changing the wavelength of excited light and the composition of glass matrix. By analyzing the fluorescence spectra and attenuation curves, we can find that there is energy transfer from Tb3 ion to Eu3 ion.
【学位授予单位】：齐鲁工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8;TQ171.7

【共引文献】