本文選題：鉬酸鹽 + 釩酸鹽　； 參考：《廣東工業(yè)大學(xué)》2017年碩士論文

【摘要】：白光LED(light emitting diode)因其高效率、低能耗、壽命長(zhǎng)以及節(jié)能環(huán)保等一系列優(yōu)點(diǎn),引起人們的廣泛關(guān)注。目前,通過(guò)將熒光粉與LED芯片組合,實(shí)現(xiàn)白光LED主要有兩種方式:其一是利用藍(lán)光LED芯片與黃色熒光粉組合;另一種是將紫外/近紫外LED芯片和三基色(紅、綠和藍(lán)光)熒光粉組合。其中第一種方案由于缺少紅色成分而色溫偏高,顯色性較低。而對(duì)于第二種方案,目前所面臨的主要挑戰(zhàn)是研究出與近紫外LED芯片匹配的高效紅色熒光粉。同時(shí)解決因不同材料間發(fā)光的相互吸收而導(dǎo)致的效率降低問(wèn)題。因此,研究新型高效的紅色或單相白色熒光粉顯得尤為重要。本文中,我們合成了 K_3Gd(VO_4)_2:Eu~(3+)、Y_2Mo_4O_(15):Dy~(3+),Eu~(3+)和Gd_2Mo_4O_(15):Eu~(3+)系列熒光粉,通過(guò)X射線衍射(XRD)、掃描電子顯微鏡(SEM)和光致發(fā)光(PL)等對(duì)樣品進(jìn)行了分析,取得以下研究進(jìn)展:1)采用固相法首次合成了K_3Gd(VO_4)_2:Eu~(3+)熒光粉。該熒光粉在紫外區(qū)域有很強(qiáng)的電荷遷移吸收帶(峰值位于314 nm),在紅光區(qū)域有很強(qiáng)的光發(fā)射(峰值位于617 nm)。增加Eu~(3+)離子的摻雜濃度可以增強(qiáng)熒光粉的發(fā)光強(qiáng)度,直至最佳摻雜濃度50 mol%,之后表現(xiàn)出濃度猝滅。K_3Gd(VO_4)_2特殊的晶格結(jié)構(gòu)導(dǎo)致了高濃度猝滅的發(fā)生。激發(fā)波長(zhǎng)由314 nm逐漸增加到346 nm時(shí),K_3Gd(VO_4)_2:Eu~(3+)熒光粉的發(fā)光顏色從紅色經(jīng)暖白光到綠色區(qū)域連續(xù)可調(diào),當(dāng)激發(fā)波長(zhǎng)為337 nm時(shí),可得到暖白光的發(fā)射。K_3Gd(VO_4)_2:Eu~(3+)具有作為紅色或單相白色熒光粉的潛在價(jià)值。2)采用固相法合成了新型顏色可調(diào)的Y_2Mo_4O_(15):Dy~(3+),Eu~(3+)系列熒光粉。單摻雜的Y_2Mo_4O_(15):Dy~(3+)熒光粉表現(xiàn)出Dy~(3+)離子的特征光發(fā)射~4F_(9/2)→~6H_(15/2)(藍(lán)光)和~4F_(9/2)→~6H_(13/2)(黃光),黃藍(lán)光之比為0.9左右。Dy~(3+)離子的最佳摻雜濃度為8 mol%。由發(fā)射譜和熒光衰減曲線分析發(fā)現(xiàn),Y_2Mo_4O_(15):Dy~(3+),Eu~(3+)熒光粉中存在從Dy~(3+)到Eu~(3+)離子的能量轉(zhuǎn)移過(guò)程。通過(guò)調(diào)整Dy~(3+)和Eu~(3+)離子的摻入濃度比,實(shí)現(xiàn)了 Y_2Mo_4O_(15):xDy~(3+),yEu~(3+)熒光粉的發(fā)光顏色在綠光、白光和橘紅光區(qū)域內(nèi)可調(diào),當(dāng)Dy~(3+)和Eu~(3+)的摻雜量分別為8 mol%和5 mol%時(shí),可以得到白光發(fā)射。3)采用固相法首次成功合成了新型Gd_2Mo_4O_(15):Eu~(3+)熒光粉。晶體結(jié)構(gòu)分析表明,Gd_2Mo_4O_(15)基質(zhì)晶格同時(shí)含有[MoO_4]、[MoO_5]以及[MoO_6]鉬酸鹽基團(tuán)。Eu~(3+)離子摻雜的Gd_2Mo_4O_(15)熒光粉,激發(fā)光譜呈現(xiàn)很寬的電荷遷移帶(210-440nm),覆蓋了紫外和近紫外區(qū)域,詳細(xì)研究了多種[MoO_x]鉬酸鹽基團(tuán)光吸收對(duì)電荷遷移帶的貢獻(xiàn)。發(fā)光中心Eu~(3+)離子主要占據(jù)非對(duì)稱性格位,在紫外、近紫外和藍(lán)光激發(fā)下,在618 nm處有較強(qiáng)的紅光發(fā)射。Eu~(3+)離子的最佳摻雜濃度為50 mol%,濃度猝滅機(jī)制為交換相互作用。
[Abstract]:White LED(light emitting diode has attracted wide attention due to its advantages of high efficiency, low energy consumption, long life and energy saving and environmental protection. At present, there are two main ways to realize white LED by combining phosphor with LED chip: one is to combine blue LED chip with yellow phosphor, the other is to combine ultraviolet / near ultraviolet LED chip and tribasic color (red). Green and blue) phosphors. The first scheme has high color temperature and low color rendering due to the lack of red component. For the second scheme, the main challenge is to develop an efficient red phosphor that matches the near-ultraviolet LED chip. At the same time, the problem of reducing the efficiency caused by the mutual absorption of luminescence between different materials is solved. Therefore, it is very important to study new high-efficient red or single-phase white phosphors. In this paper, we have synthesized a series of K_3Gd(VO_4)_2:Eu~(3 phosphors, such as K_3Gd(VO_4)_2:Eu~(3, Y2Mo4O) and Gd_2Mo_4O_(15):Eu~(3). The samples were characterized by X-ray diffraction, scanning electron microscopy (SEM) and photoluminescence (PL). K_3Gd(VO_4)_2:Eu~(3) phosphors were synthesized by solid phase method. The phosphor has a strong charge transfer absorption band in the UV region (the peak value is at 314 nm) and a strong light emission in the red region (the peak value is at 617 nm ~ (-1). The luminescence intensity of the phosphors can be enhanced by increasing the doping concentration of Eu~(3 ions until the optimum doping concentration is 50 mol.After the increase of the concentration quenching, the special lattice structure of K _ (3Gd) _ (VO _ 4) _ 2 leads to the occurrence of high concentration quenching. When the excitation wavelength was gradually increased from 314 nm to 346 nm, the luminescence color of the Phosphor was continuously adjustable from red through warm white light to green region, when the excitation wavelength was 337 nm. The emission of warm white light. K _ S _ 3G _ D _ (VO _ 3) has potential value as red or single-phase white phosphor.) A new type of Y_2Mo_4O_(15):Dy~(3 _ (3) with adjustable color has been synthesized by solid phase method. Single doped Y_2Mo_4O_(15):Dy~(3 phosphors exhibit Dy~(3) the characteristic light emission of the ion is 4F / 2) 6H / T 15 / 2 (blue light) and 4F / 9 / 2) the optimum doping concentration of the ions is 8 mol / 2 (yellow light, the ratio of yellow light to yellow light is about 0.9. Dy3) ion, the optimum doping concentration is 8 mol / 2 (blue light) and 4F / 2 / 2 (blue light ratio is 0. 9%. Dy3) ion doping concentration is 8 mol-1 / 2, the optimum doping concentration is 8 mol-1 / 2 (yellow light / blue light ratio is 0. 9% 路Dy3). From the analysis of emission spectrum and fluorescence attenuation curve, it is found that there is an energy transfer process from Dy~(3) to Eu~(3) in the Phosphor. By adjusting the concentration ratio of Dy~(3) and Eu~(3), the luminescent color of Y_2Mo_4O_(15):xDy~(3 Phosphor can be adjusted in green, white and orange region. When the doping amount of Dy~(3) and Eu~(3 is 8 mol% and 5 mol%, respectively, the luminescent color of the phosphor can be adjusted in the region of green, white and orange light, respectively, when the doping amounts of Dy~(3) and Eu~(3 are 8 mol% and 5 mol%, respectively. White emission. 3) A novel Gd_2Mo_4O_(15):Eu~(3) phosphor was synthesized successfully by solid phase method for the first time. The crystal structure analysis shows that there are [MoO_4], [MoO_5] and [MoO_6] molybdate group. EUON3) doped with Gd2Mo4OO15) phosphors, and the excitation spectra show a wide charge transfer band of 210-440 nm, covering the ultraviolet and near ultraviolet regions, and the crystal structure analysis shows that the Gd2Mo4OOC15) matrix lattice also contains [MoO_4], [MoO_5] and [MoO_6] molybdate group .Euf3) ions doped with Gd2Mo4OH15) phosphors, and the excitation spectra show a wide charge transfer band of 210-440 nm. The contribution of light absorption of various [MoO_x] molybdate groups to the charge transfer band has been studied in detail. The luminescent center Eu~(3) ion mainly occupies the asymmetric character position. Under the excitation of ultraviolet, near ultraviolet and blue light, the best doping concentration of red light emission. EUC 3) ion at 618nm is 50 mols. The mechanism of concentration quenching is exchange interaction.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN312.8;TN104.3

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