Rongjun XIE
,
Tianliang ZHOU
,
Kohei TAKAHAHIS
,
Naoto HIROSAKI
应用化学
doi:10.11944/j.issn.1000-0518.2016.08.160240
GaN-based white light-emitting diode(LED) is now an emerging backlight technology for large color gamut and high efficiency liquid crystal displays. In this technology, phosphors are key materials to control the color-space coverage, luminous efficiency, and lifetime of the backlight units, which are required to have a desired emission and a narrow emission band. β-Sialon:Eu2+(sialon:silicon aluminum oxynitride, Si6-zAlzOzN8-z) is such a green phosphor because it has an emission band centered at 525~545 nm and a small band width(~55 nm). This contribution overviews the synthesis, luminescence, electronic and crystal structure, reliability and applications of β-sialon:Eu2+. From both structure calculations and experimental observations, Eu2+ is seen to be accommodated into a large void along the c-axis, and coordinated to six nitrogen/oxygen atoms at an equivalent distance. The narrow emission band is thus ascribed to the high symmetry of the local structure of Eu2+. Both of the emission band and the band width of β-sialon:Eu2+ can be tuned by tailoring the composition(e.g., the z value), and β-sialon:Eu2+ with shorter wavelengths and narrower bands can be achieved at lower z values. Combined with other red phosphors, β-sialon:Eu2+ enables to produce wider color gamut backlights(15% up) than the conventional yttrium aluminum garnet(YAG)-based ones. Both the excellent luminescence properties and reliability make β-sialon:Eu2+ to be an extremely important green phosphor for use in advanced displays.
关键词:
rare earth
,
nitride
,
beta-sialon:Eu2+
,
phosphor
,
electronic structure
,
light-emitting diode
,
backlighting
QI Yunxin Nei Monggol Institute of Metallic Materials
,
Baotou
,
China QI Yunxin
,
Professor
,
P.O.Box No.4
,
Baotou 014034
,
Nei Monggol
,
China
金属学报(英文版)
The nitride in 30CrNi steel and its composition along boundaries have been studied by means of scanning Auger microprobe.The nitride identified metallographically is Zr(C,N)which contains a small amount of Ti and O.The interface width between the Zr(C,N)and the matrix is about 1.6 μm.An Fe-rich shell is.found on the surface of Zr(C,N)which appeared on the fracture surface.The thickness of shell is 0.1-0.8μm.The Fe concentration of its outmost layer is 3-18 at.-% and decreases exponentially along the depth direction.
关键词:
nitride
,
null
,
null
,
null
,
null
Ting XIE
,
Min YE
,
Xiaosheng FANG
,
Zhi JIANG
,
Li CHEN
,
Mingguang KONG
,
Yucheng WU
,
Lide ZHANG
材料科学技术（英文）
Aluminum nitride (AlN) nanowires, serrated nanoribbons, and nanoribbons were selectively obtained through a simple chloride assisted chemical vapor deposition process. The morphologies of the products could be controlled by adjusting the deposition position and the flux of the reactant gas. The morphologies and structures of the AlN products were investigated in detail. The formation mechanism of the as-prepared different morphologies of AlN one-dimensional (1D) nanostructures was discussed on the basis of the experimental results.
关键词:
Aluminum nitride
,
nitride
,
Morphology-controlled
,
g
Journal of Materials Science
The morphology and growth characteristics of alpha-Si3N4 whiskers grown by pyrolysis of amorphous Si-N-C powders were investigated mainly by TEM. It was found that the whiskers exhibited various morphologies including ribbon-, rod-, prism- and nodule-like whiskers. Three growth directions were found: {<1(1)over bar 00>}*, {1010}*, and {0001}* which are dense planes in the hexahedral structure of alpha-Si3N4. No bobbles existed on the whisker tips, but there was a leading growth along the whisker long axial directions and small Si3N4 grains bonded on the whisker tips, which indicated that the whiskers nucleated on small alpha-Si3N4 grains and grew by a vapour-solid condensation mechanism.
关键词:
nitride
解荣军
,
周天亮
,
高桥向星
,
广崎尚登
应用化学
doi:10.11944/j.issn.1000-0518.2016.08.160240
基于氮化镓的白光发光二极管(LED)是目前一项崭新的背光源技术,广泛应用于宽色域、高光效的液晶显示屏.在此项技术中,作为关键材料的荧光粉决定着背光单元的色域范围、发光效率和可靠性,因而要求它应具合适的发射波长和窄带发射.β-sialon∶ Eu2+(sialon:silicon aluminum oxynitride(赛龙))就是一款非常适合背光应用的绿色荧光粉,这得益于其位于525 ～ 545 nm发射峰和只有55 nm狭窄的峰宽.此文回顾和综述了β-sialon∶ Eu2+的合成方法、光谱特性、电子结构、晶体结构、可靠性和它的具体应用.计算模拟和实验测试结果表明,Eu2+位于沿c轴方向的大孔道之中,并与6个最紧邻的(0,N)原子等距离配位.因而,Eu2+的狭窄发射峰源自于Eu2+局域结构的高度对称性.β-sialon∶ Eu2+的发射波长和带宽都能通过组成裁剪,即z值,进行调控;低z值组成能够实现更短波长发射和更窄带宽.与传统的基于钇铝石榴石(YAG)荧光粉的背光源相比,β-sialon∶ Eu2+再搭配红色荧光粉制备的背光源具有更宽的色域,色域范围可提高15％以上.其优异的发光性能和高可靠性使得β-sialon∶ Eu2+成为应用于先进显示屏的极其重要的绿色发光材料.
关键词:
稀土
,
氮化物
,
beta-sialon∶Eu2+
,
荧光粉
,
电子结构
,
发光二极管
,
背光源
齐芸馨
金属学报
用SAM研究了30CrNi钢中氮化物及其界面的组成。结果表明,氮化物夹杂为含有少量Ti,O的Zr(C,N)。Zr(C,N)与基体的界面宽度约为1.6μm。断口上显露的Zr(C,N)夹杂表面存在着富Fe外壳,壳的厚度在0.1—0.8μm之间,在最表层Fe的浓度为3-18at.-％,且沿深度方向呈指数下降。
关键词:
氮化物
,
SAM analysis
,
CrNi steel
,
Fe-rich shell
李阳
,
陈奎
人工晶体学报
首先分析了Mg在直接氮化制备AlN中的催化作用,然后采用实验的方法进行验证.实验中对Mg的含量比例进行优化,并通过XRD、SEM、EDS、TG和DTG进行测试、分析和表征.结果表明,当铝粉与镁粉的质量比例不同时,镁粉起到不同程度的催化作用,产物表现为不同的外观形貌及不尽相同的物相组成.当铝粉与镁粉的质量比例为9/1,可得到直径均匀、长度可观的AlN纳米线结构.此外,结合V-S机制对纳米线的生长机理进行了解释.
关键词:
氮化
,
AlN纳米线
,
镁粉催化
,
生长机理
戴景杰
,
陈传忠
,
朱季云
,
翁飞
材料热处理学报
为提高钛合金TC4的室温力学性能和抗高温氧化性能,采用激光表面合金化技术在钛合金TC4表面进行铝合金化,氮气作为保护气体,并对合金化层的组织结构、硬度、摩擦磨损性能及抗高温氧化性能进行分析测试.结果表明,在钛合金TC4成功制备出由弥散分布的氮化物作为增强相的富铝合金化层,合金化层厚度约为1 mm,并与基体呈良好的冶金结合.室温下测得的合金化层的平均硬度约为740 HV,平均摩擦系数为0.28,而基体的硬度约为410 HV,平均摩擦系数为0.8.静态空气中800℃保温1000 h的氧化结果表明,合金化层的氧化产物主要为Al2O3和TiO2以及少量的Al3Ti5 O2的混合氧化物,单位面积增重5.16×10-3mg/mm2,而基体氧化产物主要为TiO2,单位面积增重为1.821×10-1 mg/mm2.氮化物作为弥散增强相的富铝合金化试样的室温力学性能和抗高温氧化性能显著提高.
关键词:
钛合金
,
激光表面铝合金化
,
氮化物
,
抗高温氧化性能
张平
,
杜军
中国材料进展
多层结构可以提高材料的强度、弹性模量和韧性。当尺寸减小到纳米量级时，性能将产生飞跃变化。首先探讨了多层结构提高强度、弹性模量和韧性等性能的基本原理，然后阐明了纳米尺度效应及理论，重点以过渡族金属氮化物ZrN纳米多层膜为例，研究了氮化物／金属（ZrN／Cu）纳米多层膜、ZrAIN纳米复合膜以及ZrAIN／Cu纳米多层膜的强韧化性能。结果表明，ZrN／Cu纳米多层膜的断裂韧性约是二元ZrN薄膜的2倍。当纳米多层膜的Cu单层厚度为2013131时，多层膜的K1C值最高。ZrAIN复合膜的断裂韧性与Al含量密切相关，当Al原子分数为23％时，薄膜的KIc值达3．17MPa·m^1/2，其硬度〉40Gpa，Al原子分数为47％的薄膜的K1C值则降低到1．13MPa·m…。，其硬度降低至17．1GPa。与z州／cu纳米多层膜和ZrAlN复合膜相比，以ZrAIN层和cu层为调制结构制备的ZrAlN／Cu纳米多层膜具有最高的硬度和最好的韧性。
关键词:
纳米多层膜
,
氮化物
,
金属Cu
,
强韧化
徐国涛
,
刘黎
,
鲁婷
,
张洪雷
钢铁研究
为了改善高炉炮泥的烧结性能,提高其抗侵蚀能力,在炮泥配料中加入了氮化硅或氮化硅铁.对加入氮化物的炮泥组成与结构以及氮化物的作用机理进行了分析.结果表明:氮化硅存在由氮氧化物转化为氧化物的反应过程,而氮化硅铁则氧化为硅铁的氧化物.氮化物的氧化过程伴随着结构致密化反应,能减缓碳的氧化,从而改善炮泥的耐用性能.
关键词:
高炉
,
炮泥
,
氮化物
,
微观结构
