發(fā)布時間：2018-09-19 06:09

【摘要】：白光發(fā)光二極管(WLEDs)因為具有安全、節(jié)能、環(huán)保、高亮以及壽命長等諸多優(yōu)點而被譽為新一代固體光源。熒光轉(zhuǎn)換型WLEDs(pc-WLEDs)作為制備WLEDs的主流方法,已在顯示、背光源、裝飾、照明等領(lǐng)域得到了廣泛地應(yīng)用。由于不斷發(fā)展的照明市場對pc-WLEDs性能(如發(fā)光顏色、色飽和度、色溫等)的要求越來越趨于精細化,而pc-WLEDs的發(fā)光性能又主要取決于熒光粉的發(fā)光顏色,因此制備發(fā)光顏色可調(diào)的熒光粉具有重要意義。基于此,本論文合成了幾種光色可調(diào)的熒光粉,對其發(fā)光性能做出了詳細研究,具體研究內(nèi)容如下:1.采用傳統(tǒng)高溫固相法合成了一系列Sr_3Lu(PO_4)_3:Dy~(3+),Eu~(3+)熒光粉。在近紫外光激發(fā)下,Sr_3Lu(PO_4)_3:Dy~(3+)熒光粉呈冷白光發(fā)射,Sr_3Lu(PO_4)_3:Eu~(3+)熒光粉發(fā)橙紅光。在Sr_3Lu(PO_4)_3:Dy~(3+),Eu~(3+)熒光粉中,Eu~(3+)離子補償了Dy~(3+)冷白光發(fā)射所缺少的紅色組分,熒光粉的發(fā)光顏色可通過改變Dy~(3+)、Eu~(3+)的相對摻雜濃度從冷白光,到暖白光再到紅光進行調(diào)控。進一步研究表明在Sr_3Lu(PO_4)_3:Dy~(3+),Eu~(3+)熒光粉中Dy~(3+)通過偶偶極交互作用向Eu~(3+)傳遞能量。制備的Sr_3Lu(PO_4)_3:Dy~(3+),Eu~(3+)單基質(zhì)白光熒光粉在pc-WLEDs領(lǐng)域具有潛在應(yīng)用價值。2.通過高溫固相法合成了一系列具有閃鉍礦結(jié)構(gòu)的Sr_3(Lu,Tb)(PO_4)_3:Ce~(3+)/Eu~(3+)熒光粉。在233 nm紫外光激發(fā)下,Sr_3(Lu,Tb)(PO_4)_3熒光粉的發(fā)光顏色可隨基質(zhì)中Tb~(3+)/Lu~(3+)比的增加從藍色到綠色進行調(diào)控。Sr_3Lu(PO_4)_3:0.07Ce~(3+)熒光粉280 nm紫外光激發(fā)下發(fā)藍紫光,Sr_3Lu(PO_4)_3:0.30Eu~(3+)熒光粉在395 nm近紫外光激發(fā)下發(fā)紅光。在377 nm近紫外光激發(fā)下,Sr_3Tb(PO_4)_3:Eu~(3+)熒光粉中Tb~(3+)能夠向Eu~(3+)離子傳遞能量,熒光粉的發(fā)光顏色可通過改變Eu~(3+)的摻雜濃度從綠光到紅光進行調(diào)控。在Sr_3Tb(PO_4)_3:Ce~(3+)和Sr_3Lu_(0.93-y)Tb_y(PO_4)_3:0.07Ce~(3+)熒光粉中存在Ce~(3+)向Tb~(3+)離子傳遞能量的過程,在280 nm紫外光激發(fā)下,Sr_3Tb(PO_4)_3:Ce~(3+)表現(xiàn)出高亮度綠色發(fā)射,Sr_3Lu_(0.93-y)Tb_y(PO_4)_3:0.07Ce~(3+)熒光粉的發(fā)光顏色可隨Tb~(3+)摻雜濃度的增加從藍紫光到綠光進行調(diào)控。3.通過Pechini-type溶膠-凝膠法成功制備出一系列Sr_(1-x)Eu_xAl_2O_4熒光粉。在262 nm紫外光激發(fā)下,Sr_(1-x)Eu_xAl_2O_4熒光粉表現(xiàn)出紅色發(fā)射。通過兩種方式將硼酸加入到基質(zhì)材料中得到Sr_(0.92)Eu_(0.08)Al_(2-y)B_yO_4和Sr_(0.92)Eu_(0.08)Al_2O_4/yH_3BO_3熒光粉。研究發(fā)現(xiàn)硼酸的加入有效地降低Sr_(1-x)Eu_xAl_2O_4熒光粉的成相溫度(從1200℃降到了1000 ℃)和提高Eu~(3+)的發(fā)射強度。在還原氣氛中對Sr_(1-x)Eu_xAl_2O_4和Sr_(1-x)Eu_xAl_2O_4熒光粉進行二次煅燒,實現(xiàn)了二、三價銪共存,Eu~(2+)離子的綠色寬帶發(fā)射在510 nm左右。通過控制銪離子或硼酸的摻雜濃度,熒光粉的發(fā)光顏色可從綠光,到暖白光,再到紅光進行調(diào)控。研究發(fā)現(xiàn),在空氣中經(jīng)1100 ℃以上燒結(jié)的Sr_(0.92)Eu_(0.08)Al_2O_4/yH3BO3(y=0.2~0.5)熒光粉中可以觀察到Eu~(3+)→Eu~(2+)自還原現(xiàn)象,此時熒光粉為SrAl_2O_4和Sr4Al2O7混合相,Eu~(2+)的藍綠色發(fā)射寬峰位于491 nm左右,通過改變燒結(jié)溫度、硼酸加入量或激發(fā)光波長均可實現(xiàn)對Eu~(2+)/Eu~(3+)發(fā)射強度比的調(diào)控,熒光粉實現(xiàn)了青光、白光、紅光、黃光等多種光色的發(fā)射。
[Abstract]:White light emitting diodes (WLEDs) are known as a new generation of solid-state light sources because of their safety, energy saving, environmental protection, high brightness and long life. Fluorescence-converted WLEDs (pc-WLEDs) have been widely used in display, backlight, decoration, lighting and other fields as the mainstream method of preparing WLEDs. The performance of pc-WLEDs (such as luminous color, color saturation, color temperature, etc.) is becoming more and more refined. The luminous performance of pc-WLEDs mainly depends on the luminous color of phosphors. Therefore, it is important to prepare phosphors with adjustable luminous color. A series of Sr_3Lu(PO_4)_3:Dy~ (3+) and Eu~ (3+) phosphors were synthesized by the traditional high temperature solid-state method. Under the excitation of near ultraviolet light, Sr_3Lu(PO_4)_3:Dy~ (3+) phosphors emitted cold white light and Sr_3Lu(PO_4)_3:Eu~ (3+) phosphors emitted orange red light. Eu~ (3+) ion compensates for the red component lacking in the cold white light emission of Dy~ (3+). The luminescent color of phosphors can be controlled by changing the relative doping concentration of Dy~ (3+), Eu~ (3+) from cold white light to warm white light and then to red light. Further studies show that Dy~ (3+) in Sr_3Lu (PO_4)_3:Dy~ (3+), Eu~ (3+) phosphors can be dipolarly interacted with Eu~ (3+). A series of Sr_3 (Lu, Tb) (PO_4) _3: Ce ~ (3 +) / Eu ~ (3 +) phosphors with bismuth-blending structure were synthesized by high-temperature solid-state method. Under the excitation of 233 nm ultraviolet light, the luminescence of Sr_3 (Lu, Tb) (PO_4) _3 phosphors was studied. The color of Sr_3Lu(PO_4)_3:0.07Ce~(3+) phosphor is blue violet under 280 nm UV excitation, and Sr_3Lu(PO_4)_3:0.30Eu~ (3+) phosphor is red under 395 nm near UV excitation. Under 377 nm near UV excitation, Sr_3Tb(PO_4)_3:Eu~ (3+) phosphor is blue violet. The luminescent color of phosphors can be controlled by changing the doping concentration of Eu~ (3+) from green to red light. In Sr_3Tb (PO_4) _3: Ce ~ (3+) and Sr_3Lu_ (0.93-y) Tb_y (PO_4) _3: 0.07 Ce ~ (3+) phosphors, Ce ~ (3+) can transfer energy to Tb ~ (3 +) ions by changing the doping concentration of Eu ~ (3+). Ce~ (3+) exhibits high brightness green emission, and the luminescence color of Sr_3Lu_ (0.93-y) Tb_y (PO_4) _3:0.07Ce~ (3+) phosphor can be controlled by the blue violet light to green light with the increase of Tb~ (3+) doping concentration. A series of phosphor powders were successfully prepared by the method of Tb~ sol gel method. Under the excitation of 262 UV light, Al_2O_4 phosphors show red emission. Sr_ (0.92) Eu_ (0.08) Al_ (2-y) B_yO_4 and Sr_ (0.92) Eu_ (0.08) Al_2O_4/yH_3BO_3 phosphors were prepared by adding boric acid into the matrix material in two ways. The phase-forming temperature of Sr_ (1-x) Eu_xAl_2O_4 phosphors was decreased from 1200 (1 C) to 1000 (0 (0 C) and the phase-forming temperature of Sr_ (0.92) Eu_ (0) Eu_ (0) E The emission intensity of Eu ~ (2+) is about 510 nm. By controlling the doping concentration of Eu ~ (1 - x) Eu _xAl_2O_4 and Sr (1 - x) Eu _xAl_2O_4 phosphors, the luminescence color of phosphors can be changed from green light to warm white light and then to red light. It is found that Eu~ (3+) Eu~ (2+) self-reduction can be observed in Sr_ (0.92) Eu_ (0.08) Al_2O_4/yH_3BO3 (y=0.2~0.5) phosphors sintered above 1100 C in air. The blue-green emission peak of Eu~ (2+) is about 491 nm. By changing sintering temperature, boric acid addition can be observed. The emission intensity ratio of Eu~ (2+) / Eu~ (3+) can be controlled by the input or excitation wavelength, and the luminescent powder can emit many colors, such as blue, white, red and yellow.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O482.31;TN312.8

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