兰州大学机构库 >物理科学与技术学院
三种新型氮化物红色荧光材料的制备与发光性能研究
Alternative TitleSynthesis and photoluminescence properties of three novel red emission nitride phosphors
龙强
Thesis Advisor王育华
2017-03-10
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name硕士
Keyword白光LED 氮化物荧光材料 发光性能
Abstract

氮化物荧光材料因其高荧光转化率、稳定的物化性质、优异的热猝灭性能及丰富的发光颜色成为近年来白光LED用荧光转化材料研究的热点。然而,相对传统氧化物来说,氮化物荧光材料的研究还处于初步阶段,还存在氮化物荧光材料种类不够丰富,制备工艺复杂,成本昂贵,发光机理研究缺乏等问题。本论文主要针对上述问题,选取了三种氮化物荧光材料作为研究对象,系统研究了它们的结构信息及发光特性等进行了讨论。主要内容如下:

第一部分:通过高温固相法,在800℃常压下制备了一种新型的Eu2+掺杂的LiSr4(BN2)3红色荧光粉,通过结构精修确定了化合物的晶体结构。由光谱分析得知,样品的激发谱与近紫外LED芯片相匹配,发射峰在550-750 nm之间。另外发现LiSr4(BN2)3:Eu2+存在单格位热猝灭蓝移的现象。第二部分:以Mg粉为原料,在800℃常压下制备得到Mg3N2,在此基础上掺杂Eu2+最终得到单相样品。样品在250nm到450nm区域有强吸收,在400nm下激发呈宽的红光发射,范围在500-800nm之间。第三部分:通过高温固相法制备了Eu2+掺杂的LiSrAl3N4荧光材料。在蓝光激发下(λ = 470 nm),样品的发射峰位于650 nm附近,半高宽为50 nm,150 ℃时的发光强度为室温时的87.5%。

Other Abstract

nitride phosphors, due to their high conversion efficiency, high physical-chemical stability, good thermal stability and broad emission colors, have received extensive attention as an important part for use in white LEDs in recent years. However, compared with tradition oxide phosphors, the research of nitrides is at an early stage, which still shows some disadvantages of poor species in nitride phosphors,complex synthesis production, high cost and lack of luminescence mechanism of nitride phosphors. In this paper, on the problems of the existing research on the nitride phosphors, three nitride phosphors were selected as luminescent materials and their structure information and luminescence properties are studied. The main works were contained as below:

1. A novel red emitting nitride phosphors LiSr4(BN2)3:Eu2+ were obtained via solid state reaction at constant pressure at 800℃ and the structure information are studied by using structure refinement. The samples could efficiently excited by near ultraviolet chip and show a single intense broad emission band at 550-750 nm. Moreover, a nontypical emission blue-shift in the single luminescence center with increasing temperature luminescence properties is also investigated.2.Eu2+ doped Mg3N2 phosphors was synthesized by solid state reaction at 800℃ using the Mg as starting material. The excitation spectra of the Mg3N2:Eu2+ phosphors showed strong excitation in the range 250–450 nm and the PL spectra show a red emission under 400 nm excitation in the range 500–800 nm.3. LiSrAl3N4:Eu2+ was synthesized using a solid-state reaction method. The resulting phosphors can eradiate a red emission band at about 650nm(FWHM = 50nm) under blue light (λ = 470 nm) excitation. Its emission intensity at 150℃ remained 87.5% of that measured at room temperature.

URL查看原文
Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/229415
Collection物理科学与技术学院
Recommended Citation
GB/T 7714
龙强. 三种新型氮化物红色荧光材料的制备与发光性能研究[D]. 兰州. 兰州大学,2017.
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