钨酸盐基白光LED红色荧光粉的制备及发光性能研究(2)

(3) Study the PL intensity influence of NaLaMgWO6:Eu3+ series phosphor optimized by the

different milling time。 With the increase of milling time, the phosphor red light intensity increased。

(4) Study the PL intensity of NaLa0。6:0。4Eu3+ phosphor controlled by the optimization of Mo ions doping concentration。 With the increase in the amount of Mo doping, the heterogeneous phase begins to appear。 With the increase of Mo doping concentration, the red light emission intensity of NaLa0。6Mg (W1-yMoy) O6:0。4Eu3 + (0≤y≤1) series phosphor decreased gradually, And part of CTB (charge transfer zone) obviously became wide and appeared red shift。

The PL properties of NaLaMgWO6:Eu3+ were compared with those of Y2O3: Eu3+, YAG: Ce3+, (Sr, Ca) AlSiN3: Eu2+ commercial phosphors。 NaLaMgWO6:Eu3+ phosphor prepared in this work shows some advantages, indicating that they have the potential value in the application of white LED。

Key words: white light emitting diodes; tungstate; red phosphor; Eu3+ ion doping; photoluminescence

1引言 1

1。1 LED概述 1

1。1。1 白光LED的生成方法 2

1。2 红色荧光粉 2

1。2。1 硫化物类红色荧光粉 2

1。2。2 氮化物红色荧光粉 2

1。2。3 氧化物类红色荧光粉 3

1。2。4 钙钛矿 4

1。3 发光基础简介 5

1。3。1 量子效率 5

1。3。2 荧光热稳定性 6

1。3。3 CIE色度坐标 6

1。4 荧光粉制备简介 7

1。4。1 高温固相法 7

1。4。2 共沉淀合成法 7

1。4。3 溶胶-凝胶法 8

1。4。4 微波热合成法 8

2实验部分 9

2。1 实验原料与试剂 9

2。2 实验仪器与设备 9

2。3 原料化学计量配比 10

2。4 实验方法 10

2。4。1 实验步骤 10

3实验结果分析 11

3。1 NaLa(1-x)MgWO6:xEu3+掺杂浓度对发光性能的影响 11

3。1。1 XRD 11

3。1。2 光致激发光谱 11

3。1。3 光致发射光谱 13

3。1。4 NaLa0。6MgWO6:0。4Eu3+与Y2O3: Eu3+发光性能对比 14

3。2 煅烧时间对NaLa0。6MgWO6:0。4Eu3+发光性能的影响 15

3。2。1 光致激发光谱 15

3。2。2 光致发射光谱 16

3。3 球磨时间对NaLa0。6MgWO6:0。4Eu3+发光性能的影响 16

3。3。1 SEM 17

3。3。2 光致激发光谱 17

3。3。3 光致发射光谱 19 钨酸盐基白光LED红色荧光粉的制备及发光性能研究(2):http://www.youerw.com/cailiao/lunwen_85710.html