本文選題：玻璃　切入點(diǎn)：稀土離子　出處：《齊魯工業(yè)大學(xué)》2015年碩士論文

【摘要】：發(fā)光二極管(LED)是一種將電能轉(zhuǎn)變?yōu)楣饽艿陌雽?dǎo)體發(fā)光器件,具有節(jié)能、壽命長(zhǎng)、啟動(dòng)時(shí)間短、環(huán)保、低壓安全等特點(diǎn)。LED技術(shù)的快速發(fā)展引起了人們的普遍關(guān)注,現(xiàn)在已成為極具影響力和發(fā)展前景的一項(xiàng)高新技術(shù)產(chǎn)品。目前,利用LED實(shí)現(xiàn)白光的主要方式是熒光粉與LED半導(dǎo)體芯片復(fù)合。與熒光粉相比,發(fā)光玻璃易加工成各種所需的形狀,可以與半導(dǎo)體芯片直接封裝而不需要環(huán)氧樹脂、具有較高的熱穩(wěn)定性、容易實(shí)現(xiàn)量產(chǎn)和不存在光圈效應(yīng)等優(yōu)點(diǎn)。因此,采用稀土離子摻雜的發(fā)光玻璃代替相應(yīng)的熒光粉,應(yīng)用于白光LED(W-LED)器件的制備,是具有實(shí)際應(yīng)用意義的。采用熔融冷卻法制備了稀土離子Eu3+、Tb3+和Dy3+單摻或者共摻的發(fā)光玻璃。采用激發(fā)光譜、發(fā)射光譜、色溫、色坐標(biāo)和衰減曲線對(duì)發(fā)光玻璃的發(fā)光性能進(jìn)行了研究；研究了玻璃基質(zhì)組成對(duì)稀土離子發(fā)光的影響；探討了稀土離子之間的能量傳遞。結(jié)果表明,在近紫外光激發(fā)下,Eu-、Tb-和Dy-共摻雜硅酸鹽玻璃能夠?qū)崿F(xiàn)白光發(fā)射,與此同時(shí)發(fā)射光的顏色可通過改變玻璃的組成和激發(fā)光波長(zhǎng)進(jìn)行調(diào)控；在Tb3+離子單摻雜玻璃中,通過引入B203可以抑制Tb3+離子的5D3發(fā)射；在Eu離子單摻雜氟氧鋁硅酸鹽玻璃中,存在Eu3+離子到Eu2+離子的還原,在玻璃組成中加入CaF2能夠增強(qiáng)還原的效率；在Eu/Tb/Dy共摻雜玻璃中存在從Tb3+離子到Eu3+離子和Dy3+離子到Tb3+離子的能量傳遞。對(duì)于Eu/Tb共摻雜玻璃,發(fā)現(xiàn)玻璃組成中引入B203和CaF2能夠提高Eu3+離子所處的微環(huán)境的對(duì)稱性,引入的CaF2會(huì)在玻璃中形成CaF2晶體同時(shí)能夠增強(qiáng)Eu3+離子的熒光壽命；Eu/Tb共摻雜鋁硅酸鹽玻璃能夠在紫外光激發(fā)下發(fā)射白光,并且發(fā)光顏色能夠通過改變激發(fā)光波長(zhǎng)和玻璃基質(zhì)組成進(jìn)行調(diào)控；通過分析熒光光譜和衰減曲線我們可以發(fā)現(xiàn)存在著從Tb3+離子到Eu3+離子的能量傳遞。
[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.
【學(xué)位授予單位】：齊魯工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN312.8;TQ171.7

【共引文獻(xiàn)】

相關(guān)博士學(xué)位論文 前2條

1 王友發(fā);Ce~(3+):YVO_4晶體的發(fā)光特性及在白光LED中的應(yīng)用[D];天津大學(xué);2013年

2 胡晨;多輸出LED驅(qū)動(dòng)器的無源精確均流方法研究[D];浙江大學(xué);2014年

相關(guān)碩士學(xué)位論文 前5條

1 祁姝琪;LED芯片的COB封裝技術(shù)[D];杭州電子科技大學(xué);2013年

2 劉兵后;一種新型LED驅(qū)動(dòng)電源的研究與設(shè)計(jì)[D];華南理工大學(xué);2014年

3 廖珠君;基于TRIZ的LED路燈加速壽命試驗(yàn)原理方案研究[D];西華大學(xué);2014年

4 凌嘉輝;應(yīng)用鋁碳化硅散熱基板的LED高性能COB封裝[D];華南理工大學(xué);2014年

5 楊明金;LED魯棒變?cè)鲆婧懔骺刂蒲芯颗c實(shí)現(xiàn)[D];華南理工大學(xué);2015年

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本文編號(hào)：1664386