【摘要】：白光發(fā)光二極管(WLEDs)具有發(fā)光效率高,低能耗,壽命長以及節(jié)能環(huán)保等優(yōu)點(diǎn),已經(jīng)引起大量科研工作者的關(guān)注。在本論文中,利用傳統(tǒng)的高溫固相法制備了Sr_(10(1-x))Cl_2(PO_4)_6:10xEu~(2+),Ca_9NaZn(PO_4)_7:Eu~(2+)/Eu~(3+),Tb~(3+)及Ca_(2(1-x))B_2P_2O_(10):2xEu~(2+)三種熒光粉并對其晶體結(jié)構(gòu)、微觀形貌、光致發(fā)光性能、熱穩(wěn)定性、熒光壽命等進(jìn)行了研究。1.采用傳統(tǒng)的高溫固相法合成一系列藍(lán)光熒光粉Sr_(10(1-x))Cl_2(PO_4)_6:10xEu~(2+)(x=0.01,0.02,0.03,0.04,0.05)。通過X射線衍射(XRD)和場發(fā)射掃描電子顯微鏡(FE-SEM)對該熒光粉的晶體結(jié)構(gòu)和微觀形貌進(jìn)行了表征。并通過激發(fā)光譜和發(fā)射光譜研究了該熒光粉的熒光發(fā)光性能。在Sr_(10(1-x))Cl_2(PO_4)_6:10xEu~(2+)熒光粉中Eu~(2+)離子的最佳摻雜濃度被確定為x=0.02。該熒光粉中Eu~(2+)濃度猝滅被證實(shí)為輻射再吸收和偶極-偶極相互作用這兩種機(jī)理的共同作用的結(jié)果。并通過研究熒光粉發(fā)光強(qiáng)度隨溫度變化規(guī)率對熒光粉Sr_(9.80)Cl_2(PO_4)_6:0.20Eu~(2+)的熱穩(wěn)定性進(jìn)行了評價。分析了不同Eu~(2+)摻雜濃度和不同溫度下Sr_(10)Cl_2(PO_4)_6:Eu~(2+)熒光粉的熒光衰減曲線。計算了熱猝滅的活化能(Ea)。所有的數(shù)據(jù)均表明,Sr_(10)Cl_2(PO_4)_6:Eu~(2+)熒光粉是一種有希望應(yīng)用于白光LED的藍(lán)光熒光粉。2.采用傳統(tǒng)高溫固相反應(yīng)在1000℃的合成了一種新型白光熒光粉Ca_9NaZn(PO_4)_7:Eu~(2+)/Eu~(3+),Tb~(3+)(CNZP:Eu~(2+)/Eu~(3+),Tb~(3+)),并研究了該熒光粉的熒光發(fā)光性能,稀土離子摻雜濃度及熒光衰變曲線。由于Eu~(2+)的半徑大于Ca~(2+)的半徑,熒光粉基質(zhì)中發(fā)生了Eu~(3+)到Eu~(2+)的部分還原。在CNZP:Eu~(2+)/Eu~(3+),Tb~(3+)熒光粉基質(zhì)中檢測到了兩種能量傳遞現(xiàn)象,包括從Eu~(2+)到Tb~(3+)的能量傳遞和從Tb~(3+)到Eu~(3+)的能量傳遞。通過改變稀土激活離子的摻雜量,CNZP:Eu~(2+)/Eu~(3+),Tb~(3+)熒光粉的CIE色度坐標(biāo)從紅色(0.439,0.309)移動到暖白(0.401,0.361),又從暖白色(0.401,0.361)移至黃綠色(0.380,0.438)。此外CNZP:Eu~(2+)/Eu~(3+),Tb~(3+)熒光粉還展示了良好的熱穩(wěn)定性。結(jié)果表明,顏色可調(diào)的Ca_(9-9x-9y)NaZn(PO_4)_7:9xEu~(2+)/Eu~(3+),9yTb~(3+)(0.00≤x≤0.010,0.003≤y≤0.018)熒光粉在白光LED中具有潛在的應(yīng)用價值。3.通過傳統(tǒng)的高溫固相反應(yīng)在800℃下合成一種新型藍(lán)色發(fā)光熒光粉Ca_2B_2P_2O_(10):Eu~(2+)。通過X射線衍射(XRD)和掃描電子顯微鏡(SEM)對所制備的熒光粉的晶體結(jié)構(gòu)和微觀形貌進(jìn)行了表征。通過激發(fā)光譜和發(fā)射光譜研究該熒光粉的熒光發(fā)光性質(zhì)。在Ca_2B_2P_2O_(10)熒光粉基質(zhì)中Eu~(2+)離子的最佳摻雜濃度被確定為1.0 mol%。并詳細(xì)的研究了熒光粉的濃度猝滅機(jī)理。該熒光粉濃度猝滅機(jī)理被確定為多級-多級相互作用機(jī)理。
[Abstract]:White light-emitting diode (WLEDs) has attracted the attention of a large number of researchers for its advantages of high luminous efficiency, low energy consumption, long life and energy saving and environmental protection. In this thesis, Sr_ (10 (1-x) Cl_2 (PO_4) _ 6: 10x EU ~ (2), Ca_9NaZn (PO_4) _ 7: EU2 / Eu~ (3) were prepared by conventional high-temperature solid-state method. Tb~ (3) and Ca_ (2 (1-x) B _ 2P _ 2P _ (10): 2x EU ~ (2) phosphors were prepared and their crystal structure, microstructure, photoluminescence, thermal stability and fluorescence lifetime were studied. A series of blue phosphors Sr_ (10 (1-x) Cl_2 (PO_4) _ 6: 10x EU ~ (2) were synthesized by conventional high-temperature solid-state method. The crystal structure and microstructure of the phosphor were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The luminescence properties of the phosphors were studied by excitation and emission spectra. The optimum doping concentration of Eu~ (2) ions in Sr_ (10 (1-x) Cl_2 (PO_4) _ 6: 10xEu2) phosphors is determined to be xN0.02. The concentration quenching of Eu~ (2) in the phosphor has been proved to be the result of the interaction of radiation reabsorption and dipole-dipole interaction. The thermal stability of phosphor Sr_ (9.80) Cl_2 (PO_4) _ 6: 0.20 Eu2 was evaluated by studying the dependence of luminescence intensity on temperature. The fluorescence decay curves of Sr_ (10) Cl_2 (PO_4) _ 6: EU2 phosphors with different Eu~ (2) doping concentrations and different temperatures were analyzed. The activation energy (Ea). Of thermal quenching was calculated. All the data show that Sr_ (10) Cl_2 (PO_4) _ 6: EU2 phosphor is a promising blue phosphor for white LED. A new white phosphor Ca_9NaZn (PO_4) _ 7: EU2 / Eu~ (3), Tb~ (3) (CNZP:Eu~ (2) / Eu~ (3), Tb~ (3),) was synthesized by conventional high temperature solid state reaction at 1000 鈩，

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