【摘要】：稀土離子獨(dú)特的發(fā)光特性,使其在發(fā)光材料應(yīng)用領(lǐng)域中有著不可代替的作用。Eu3+為激活劑的發(fā)光材料已成為紅色熒光粉的重要來源,Eu3+的發(fā)光性質(zhì)與之匹配的基質(zhì)材料的種類、晶相密切相關(guān),所以研究不同基質(zhì)材料中Eu3+的發(fā)光性質(zhì)受到普遍關(guān)注。鈦酸鹽是一類新型的,物理化學(xué)性質(zhì)穩(wěn)定的發(fā)光基質(zhì)材料,本文選取鈦酸鋅、鈦酸鎂、鈦酸鑭鈉、鈦酸釔鈉作為基質(zhì),采用溶膠-凝膠法制備了Eu3+摻雜ZnTiO3和Zn2TiO4,Eu3+、Gd3+共摻雜MgTiO3,Eu3+摻雜Na2La2Ti3O10和Eu3+摻雜NaYTiO4基紅色熒光粉。以X-射線衍射(XRD)、差熱-熱重(DTA-TGA)、紅外光譜(IR)等技術(shù)對制備樣品的結(jié)構(gòu)進(jìn)行了表征,通過熒光光譜及色坐標(biāo)對其發(fā)光性質(zhì)進(jìn)行了研究。采用溶膠-凝膠法制備了Eu3+摻雜ZnTiO3和Zn2TiO4發(fā)光材料,經(jīng)500℃退火處理后,樣品呈現(xiàn)立方相ZnTiO3,當(dāng)退火溫度達(dá)到700℃時,樣品呈現(xiàn)四方相Zn2TiO4。通過Eu3+摻雜ZnTiO3和Zn2TiO4發(fā)光材料的激發(fā)及發(fā)射光譜,發(fā)現(xiàn)均以465nm藍(lán)光作為最佳激發(fā)波長,可以得到以Eu3+的5D 0→7F 2躍遷為主的紅色熒光粉。通過計算Eu3+摻雜ZnTiO3和Zn2TiO4的色坐標(biāo)值,得知Eu3+摻雜ZnTiO3的色坐標(biāo)值為(0.6233,0.3762),接近于美國國家電視標(biāo)準(zhǔn)委員會NTSC標(biāo)準(zhǔn)值(0.670,0.330)。有望成為適用于藍(lán)光LED芯片的新型紅光材料。利用溶膠-凝膠法制備了MgTiO3:Eu3+、Gd3+紅色熒光粉。對Eu3+及Eu3+、Gd3+共摻后MgTiO3紅色熒光粉中Gd3+對MgTiO3:Eu3+體系中Eu3+發(fā)光性質(zhì)的影響進(jìn)行了研究。在MgTiO3:Eu3+、Gd3+體系中Eu3+的發(fā)光強(qiáng)度強(qiáng)于Eu3+的單一摻雜。說明在MgTiO3:Eu3+、Gd3+樣品中,Eu3+和Gd3+離子之間發(fā)生了能量傳遞,提高了Eu3+在MgTiO3基質(zhì)中的發(fā)光性能。以乙二醇為穩(wěn)定劑,利用溶膠-凝膠法合成了Eu3+摻雜Na2La2Ti3O10紅色發(fā)光材料。經(jīng)600℃退火處理后,得到中間產(chǎn)物立方相Na0.5La0.5TiO3,當(dāng)退火溫度達(dá)到700℃時,得到終產(chǎn)物四方相Na2La2Ti3O10。通過Na2La2Ti3O10:Eu3+樣品的激發(fā)光譜及發(fā)射光譜,發(fā)現(xiàn)最佳激發(fā)波為397nm,以397nm紫外光作為激發(fā)能量,得到了以Eu3+的5D0→7F2電偶極躍遷為主的紅色熒光粉。通過計算Na2La2Ti3O10:Eu3+的色坐標(biāo)值為(0.6251,0.3744),接近于NTSC標(biāo)準(zhǔn)色坐標(biāo)值(0.670,0.330)。研究了Eu3+摻雜NaYTiO4紅色發(fā)光材料,XRD結(jié)果表明,經(jīng)過800℃焙燒2h后得到純的四方相結(jié)構(gòu)NaYTiO4:Eu3+熒光粉。通過分析NaYTiO4:Eu3+樣品的激發(fā)光譜和發(fā)射光譜,發(fā)現(xiàn)最佳激發(fā)波長為397nm,以397nm紫外光作為激發(fā)波長,得到了以Eu3+的5D0→7F2電偶極躍遷為主的紅色發(fā)光材料。以ZnTiO3、Zn2TiO4、MgTiO3、Na2La2Ti3O10、NaYTiO4為基質(zhì)材料,以最為常見的Eu3+為激活劑,采用簡單易于操作的溶膠-凝膠法,制備出發(fā)光性能優(yōu)良的鈦酸鹽基質(zhì)紅色熒光粉材料,為更加豐富稀土發(fā)光材料的領(lǐng)域,拓寬鈦酸鹽的應(yīng)用范圍提供了信息。
[Abstract]:Due to its unique luminescence properties, rare earth ions play an irreplaceable role in the application of luminescent materials. EU3 as an activator has become an important source of red phosphors. Because the crystal phase is closely related, the luminescence properties of EU _ 3 in different matrix materials have been paid more and more attention. Titanate is a new kind of luminescent substrate with stable physical and chemical properties. Zinc titanate, magnesium titanate, sodium lanthanum titanate and sodium yttrium titanate are selected as the substrate in this paper. Eu3-doped ZnTiO3 and Zn2TiO4E3-Gd3 co-doped MgTiO3- EU3-doped Na2La2Ti3O10 and Eu3-doped NaYTiO4-based red phosphors were prepared by sol-gel method. The structure of the prepared samples was characterized by X-ray diffraction (XRD), differential thermogravimetry (DTA-TGA) and infrared spectroscopy (IR). The luminescent properties of the samples were studied by fluorescence spectra and color coordinates. EU3-doped ZnTiO3 and Zn2TiO4 luminescent materials were prepared by sol-gel method. After annealing at 500 鈩，

本文編號：2119779