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摘要 1
Abstract 2
一、引言 3
1.1 白光LED發(fā)展背景 3
1.2 白光LED基本原理 3
1.2.1 發(fā)光二極管的原理 3
1.2.2白光LED的實現(xiàn)方式 4
1.3 白光LED用熒光粉的研究現(xiàn)狀 6
1.3.1 基于藍光 LED 芯片激發(fā)的熒光粉 6
1.4 本課題的研究意義及內(nèi)容 8
1.4.1 本課題的研究意義 8
1.4.2 本課題的研究內(nèi)容 9
二、實驗方法 10
2.1 實驗試劑及設備 10
2.1.1 實驗試劑 10
2.1.2 實驗設備 10
2.2 高溫固相法制備Y2O3:Eu3+,Tb3+ 10
2.3 水熱合成法制備Y2O3:Eu3+,Tb3+ 11
2.4 樣品檢測 12
2.4.1 XRD檢測 12
2.4.2 TEM檢測 12
2.4.3 熒光光譜檢測 12
三、結果與討論 13
3.1 物相分析 13
3.2 熒光光譜分析 14
3.2.1 樣品Y2O3:Eu3+(1 mol%Eu3+)的光譜分析 14
3.2.2樣品Y2O3:Tb3+(1 mol%Tb3+)光譜分析 15
3.2.3 1 mol%Eu3+,2 mol%Tb3+的光譜分析 17

3.2.4 1 mol%、2 mol%、4 mol%Tb3++1%Eu3+的光譜分析 18
3.2.5 1 mol%、2 mol%、4 mol%Eu3+1%Tb3+的光譜分析 19
3.2.6 不同摻雜組合的發(fā)射光譜分析 21
3.3高溫固相法與水熱法對熒光粉的發(fā)光性能影響 21
四、結論 23
參考文獻 24
致謝 28


摘要
目前，廣泛使用的白光LED主要采用藍光+黃色熒光粉的方式，這種方式產(chǎn)生的白光中缺乏紅光成分，顯色指數(shù)偏低，發(fā)光效率也不高。為了提高所發(fā)白光的穩(wěn)定性和光學性質等，本文研究采用紫外光激發(fā)，且是單一基質的白光熒光粉。實驗中采用高溫固相法和水熱合成法在Y2O3中摻雜不同比例的Eu3+和Tb3+制備出氧化物熒光粉（Y2O3:Eu3+,Tb3+），并通過XRD、TEM發(fā)射光譜和激發(fā)光譜對樣品進行物相分析和光學性質分析。
研究發(fā)現(xiàn)，在激發(fā)譜中，由于Eu–O的電荷遷移帶（CTB)和Tb3+的4f5d躍遷吸收會在紫外光區(qū)域形成強度很高的吸收帶，在發(fā)射譜中有則有藍色(490 nm)，綠色(545 nm)，紅色(615 nm)三種顏色的峰，并可以通過不同的摻雜比例和激發(fā)光波長來調節(jié)三種顏色的光強比。因此，所發(fā)出的白光穩(wěn)定性好，顯色指數(shù)高。共摻雜Eu3+和Tb3+時，Tb3+不僅可以吸收紫外光和作為敏化劑將能量傳給Eu3+，而且可以作為活化劑和能量受體，并且Tb3+作為Eu3+敏化劑的效率與其摻雜濃度密切相關。同時，還發(fā)現(xiàn)采用水熱合成法制備的樣品對紫外光的吸收和發(fā)射光強度比固相法的要強很多。

關鍵詞：氧化銪 氧化鋱 白光 熒光粉 能量轉移 光譜性質

Abstract
Now yttrium aluminum garnet yellow phosphor coating (Y3Al5O12:Ce,YAG:Ce) was widely applied in lighting lamp and commercial pc-WLEDs. However, due to the shortage of red emission, the WLEDs made by means of blue chip + YAG:Ce have poor color rendering index and the light emitting efficiency is very low. In order to improve the stability and optical properties of the WLEDs, this study try to research a single matrix phosphor, which can be excited by UV light. In this study, the Y2O3:Eu3+ ,Tb3+ white phosphors were obtained by high-temperature solid-phase and hydrothermal synthesis method. Their structure and morphology have been analyzed by X-ray powder diffraction (XRD), the transmission electron microscopy (TEM), and the optical properties were analyzed by the spectra of samples.
The experiment results show that: due to the charge transfer band (CTB) of Eu3+-O2- bond and 5D4-7F5 transition of the Tb3+, the absorption bands formed in the UV region. In the excitation spectra, three excitation peaks are observed. by changing doping ratio and the wavelength of the excitation light, we can adjust the ratio of the intensities of the three colors. When co-doped with Eu3+ and Tb3+, the Tb3+ not only absorbs UV radiation and efficiently transfer its energy to Eu3+, but also act as activators and energy acceptors. The energy transfer efficiency from Tb3+ to Eu3+ depends strongly on their doping concentrations. In addition,the intensity of UV absorption and emission by High-temperature solid-phase is much stronger than that by hydrothermal synthesis method.

Keyword：europium oxide；Terbium oxide；White；phosphor；Energy transfer；Luminescence property