發(fā)布時(shí)間：2018-09-17 06:52

【摘要】：LED(light-emitting-diode,即發(fā)光二極管)作為第四代固態(tài)照明光源與傳統(tǒng)的照明光源比具有體積小、發(fā)熱量低、亮度高、使用壽命長(zhǎng)、環(huán)保、色彩多樣等優(yōu)點(diǎn)。其中紫外光激發(fā)的LED與藍(lán)光LED以及三色基LED相比,其顏色可控,均勻度更好。發(fā)光材料的性能對(duì)紫外LED起著關(guān)鍵的作用,因此尋找適合紫外光LED用熒光粉非常重要。以磷酸鹽體系為基質(zhì)的熒光粉具有較好的吸收能力和較高的轉(zhuǎn)換效率�；诖�,本文進(jìn)行了以下工作:1.采用水熱法合成了La PO_4:RE(RE=Eu~(3+),Tb~(3+))及Bi PO_4:RE(RE=Dy~(3+),Tb~(3+))兩種熒光粉,研究了材料的光譜特性。結(jié)果顯示La PO_4:Eu~(3+)在394 nm紫外光激發(fā)下發(fā)射紅光,La PO_4:Tb~(3+)在369 nm紫外光的激發(fā)下發(fā)射綠光。BiPO_4:Dy~(3+)在350 nm紫外光的激發(fā)下最終發(fā)射白光,BiPO_4:Tb~(3+)在369 nm紫外光激發(fā)下產(chǎn)生綠色發(fā)光。2.采用水熱法合成了Na_3Y(PO_4)_2:RE(RE=Eu~(3+),Tb~(3+))稀土磷酸鹽熒光粉,并對(duì)其形貌以及光譜性質(zhì)進(jìn)行研究。結(jié)果表明:該粒子呈現(xiàn)紡錘形,尺寸均一,Na_3Y(PO_4)_2:Eu~(3+)在394 nm紫外光激發(fā)下發(fā)射紅光,Na_3Y(PO_4)_2:Tb~(3+)在369 nm紫外光的激發(fā)下呈現(xiàn)綠色發(fā)光。3.采用水熱法合成了Zn_3(PO_4)_2基質(zhì)以及Zn_(2.75)(PO_4)_2:Tb_(0.25)~(3+)熒光粉,研究了pH值對(duì)該物質(zhì)形成的影響以及稀土離子摻雜后的光譜特性。結(jié)果表明:酸性條件下有利于形成Zn_3(PO_4)_2,中性條件下形成Zn_3(PO_4)_2以及NH_4Zn PO_4的混合物,堿性條件下形成純相NH_4Zn PO_4,Zn_(2.75)(PO_4)_2:Tb_(0.25)~(3+)最終呈現(xiàn)綠色發(fā)光。4.通過高溫固相法合成了LiBaPO_4:Dy~(3+)磷光體,并對(duì)其光譜性質(zhì)以及熱釋光性質(zhì)進(jìn)行了研究。結(jié)果表明:該物質(zhì)可以被370~410 nm光激發(fā),最終發(fā)射白光,同時(shí)是一種良好的熱釋光材料。
[Abstract]:LED (light-emitting-diode) as the fourth generation of solid-state lighting source has the advantages of small size, low calorific value, high brightness, long service life, environmental protection and color diversity compared with traditional lighting source. The phosphors based on phosphate system have good absorption ability and high conversion efficiency. Based on this, the following work has been done: 1. La PO_4:RE (RE = Eu~ (3+), Tb~ (3+) and Bi PO_4:RE (RE = Dy) were synthesized by hydrothermal method. The results show that La PO_4:Eu~ (3+) emits red light under the excitation of 394 nm ultraviolet light and La PO_4:Tb~ (3+) emits green light under the excitation of 369 nm ultraviolet light. BiPO_4:Dy~ (3+) emits white light under the excitation of 350 nm ultraviolet light and BiPO_4:Tb~ (3+) emits green light under the excitation of 369 nm ultraviolet light. Color luminescence. 2. Na_3Y(PO_4)_2:RE(RE=Eu~ (3+), Tb~ (3+) rare earth phosphate phosphors were synthesized by hydrothermal method, and their morphology and spectral properties were studied. The results showed that the phosphors were spindle-shaped, uniform in size, red in Na_3Y(PO_4)_2:Eu~ (3+) excited by 394 nm ultraviolet light, and Na_3Y(PO_4)_2:Tb~ (3+) in 369 nm ultraviolet light. The Zn_3(PO_4)_2 matrix and Zn_(2.75)(PO_4)_2:Tb_(0.25)~(3+) phosphors were synthesized by hydrothermal method. The influence of pH value on the formation of Zn_3(PO_4)_2 and the spectral characteristics of rare earth ions doped Zn_3(PO_4)_2 were studied. The pure phase NH_4Zn PO_4, Zn_ (2.75) (PO_4) _2: Tb_ (0.25) ~ (3+) was formed by the mixture of NH_4Zn PO_4 under alkaline condition. The green luminescence was finally observed. 4. LiBaPO_4: Dy_ (3+) phosphor was synthesized by high temperature solid-state method, and its spectroscopic properties and thermoluminescence properties were studied. White light is also a good thermoluminescent material.
【學(xué)位授予單位】：沈陽師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ422

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本文編號(hào)：2245067