摘 要：为开发出新的白光LED用发光颜色可调荧光粉，本论文采取高温固相法制备了NaSr1–y-zBayCazPO4:Eu2+,Mn2+ (0 ≤ y ≤ 0。5, 0 ≤ z ≤ 0。3)系列样品。对于单掺Eu2+的NaSrPO4荧光粉，其Eu2+主发射带在446nm处，且Eu2+的最佳掺杂浓度为0。3%。在NaSrPO4:Eu2+中掺入Ba2+后，Eu2+的发射带呈现蓝移，发射强度极大增强。而掺入Ca2+后，Eu2+的发射带边缘呈现出轻微的红移， 500nm之后的发射带强度被显著提升。为进一步实现发光可调，本实验在NaSr0。5Ba0。5PO4和NaSr0。95Ca0。05PO4中均进行了Mn2+-Eu2+共掺杂，并观察和证实了Eu2+到Mn2+的能量转换。通过研究NaSr0。497Ba0。5(PO4):0。003Eu2+和NaSr0。947Ca0。05(PO4):0。003Eu2+的热稳定发光性能发现，二者具有不同的热淬灭性。基于以上研究，NaSr1–y-zBayCazPO4:Eu2+,Mn2+将有望成为白光LED用候选发光材料。93852

毕业论文关键词：光致发光，荧光粉，LED

Abstract: To develop new emission-tunable phosphors for white LEDs, a series of NaSr1–y-zBayCazPO4:Eu2+,Mn2+ (0 ≤ y ≤ 0。5, 0 ≤ z ≤ 0。3) phosphors were prepared by solid-state reaction method in this paper。 For Eu2+-single-doped NaSr(PO4), the Eu2+ dominant emission band is located at 446 nm, and the optimal Eu2+ concentration is for 0。3%。 When the Ba2+ is doped into NaSrPO4:Eu2+, the Eu2+ emission band exhibits a blue-shift and the emission intensity is enhanced largely。 With the Ca2+ incorporated, the emission band edge of Eu2+ shows a slight red-shift and that beyond 500 nm has been raised obviously。 To further obtain the tunable-emission, Mn2+ is co-doped with Eu2+ in both NaSr0。5Ba0。5 (PO4) and NaSr0。95Ca0。05(PO4), an energy transfer from Eu2+ to Mn2+ was observed and verified。 By studying the thermal stable luminescence of NaSr0。497Ba0。5(PO4):0。003Eu2+ and NaSr0。947Ca0。05(PO4):0。003Eu2+, different thermal quenching abilities were achieved。 Based on these, the NaSr1–y-zBayCazPO4:Eu2+,Mn2+ could be promising candidate for white LEDs。源C于H优J尔W论R文M网WwW.youeRw.com 原文+QQ752-018766

Keyword: Photoluminescence; Phosphors; LEDs

目　录

1  前言 1

1。1  研究背景 1

1。2  稀土发光材料 1

1。3  稀土荧光粉制备方法及性能评价 1

1。4  LED白光的实现方式 2

2  实验部分 3

2。1  主要试剂和仪器 3

2。1。1  实验所用主要试剂 3

2。1。2  实验主要设备 4

2。2  实验过程 4

2。4  样品的测试 4

2。4。1  X射线粉末衍射(XRD) 4

2。4。2  荧光性能测试 4

3  实验结果及讨论 5

3。1  XRD分析 5

3。2  发光性质研究 6

3。2。1  掺杂Eu2+的NaSrPO4发光光谱研究 6

3。2。2  掺杂Ba2+/Ca2+的NaSr0。997(PO4):0。003Eu2+发光光谱研究 7

3。2。3  掺杂Eu2+-Mn2+的NaSr0。5Ba0。5(PO4)和NaSr0。95Ca0。05(PO4)发光光谱研究 10

3。2。4 NaSr0。497Ba0。5(PO4):0。003Eu2+与NaSr0。947Ca0。05(PO4):0。003Eu2+的发光热稳定性研究