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国家重点基础研究发展计划(2007CB936202)

作品数:9 被引量:15H指数:3
相关作者:姜勇苏喜平闫树科包瑾徐晓光更多>>
相关机构:北京科技大学北京工商大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金教育部“新世纪优秀人才支持计划”更多>>
相关领域:理学一般工业技术电子电信建筑科学更多>>

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Structure and luminescence of Ca_2Si_5N_8:Eu^(2+) phosphor for warm white light-emitting diodes被引量:1
2009年
We have synthesized Ca2Si5N8:Eu^2+ phosphor through a solid-state reaction and investigated its structural and luminescent properties. Our Rietveld refinement of the crystal structure of Ca1.9Eu0.1Si5N8 reveals that Eu atoms substituting for Ca atoms occupy two crystallographic positions. Between 10 K and 300 K, Ca2Si5N8:Eu^2+ phosphor shows a broad red emission band centred at -1.97 eV-2.01 eV. The gravity centre of the excitation band is located at 3.0 eV 3.31 eV. The centroid shift of the 5d levels of Eu^2+ is determined to be -1.17 eV, and the red-shift of the lowest absorption band to be - 0.54 eV due to the crystal field splitting. We have analysed the temperature dependence of PL by using a configuration coordinate model. The Huang-Rhys parameter S = 6.0, the phonon energy hv = 52 meV, and the Stokes shift △S = 0.57 eV are obtained. The emission intensity maximum occurring at -200 K can be explained by a trapping effect. Both photoluminescence (PL) emission intensity and decay time decrease with temperature increasing beyond 200 K due to the non-radiative process.
魏小丹蔡丽艳鲁法春陈小龙陈学元刘泉林
关键词:LUMINESCENCESTRUCTURENITRIDEEUROPIUM
合成反铁磁Ni81Fe19/Co90Fe10/Ru/Co90Fe10/Ni81Fe19的研究
2008年
采用直流磁控溅射方法制备了一系列的合成反铁磁及以其为自由层的自旋阀.研究发现,在Ni81Fe19与Ru层之间插入适当厚度的Co90Fe10层后,可有效地提高合成反铁磁两磁性层间的反铁磁耦合强度,得到具有饱和场Hs更高、饱和磁化强度Ms更低、热稳定性更好的合成反铁磁.另外,以这种合成反铁磁作自旋阀的自由层时,可有效提高自旋阀的稳定性.
闫树科包瑾苏喜平徐晓光姜勇
关键词:退火自旋阀
双合成反铁磁结构及其对自旋阀巨磁电阻效应的影响被引量:1
2008年
用直流磁控溅射方法制备了双合成反铁磁结构Co90Fe10(5nm)/Ru(xnm)/Co90Fe10(3nm)/Ru(ynm)/Co90Fe10(5nm)(x=0.45,0.45,1.00;y=0.45,1.00,1.00)的系列样品,并对样品的性能及其作为钉扎层对自旋阀巨磁电阻(GMR)效应的影响进行了研究.结果表明,双合成反铁磁结构比普通合成反铁磁结构Co90Fe10(5nm)/Ru(0.5nm)/Co90Fe10(3nm)具有更优越的性能,并且双合成反铁磁结构作为钉扎层对自旋阀的GMR有很大提高.
苏喜平包瑾闫树科徐晓光姜勇
关键词:自旋阀巨磁电阻
Direct Observation of the Strong Interaction Between Carbon Nanotubes and Quartz Substrate被引量:4
2009年
We present a chemical vapor deposition(CVD)method for the growth of uniform single-walled carbon nanotube(SWNT)arrays on a stable temperature(ST)-cut single crystal quartz substrate using a mixture of methanol and ethanol as carbon source.It is found that introducing methanol during the growth can improve the density and the length of the well-aligned SWNTs in the arrays as well as increase the SWNT/quartz interaction.Obvious“up-shifts”of G-band frequencies in the Raman spectra have been found for the aligned SWNTs.A well-designed control experiment shows that the G-band“up-shifts”originate from the strong interaction between SWNTs and the quartz substrate.It is believed that exploring this interaction will help to elucidate the growth mechanism;ultimately,this will help realize the promise of controlling the chirality of SWNTs.
Lei DingWeiwei ZhouThomas P.McNicholasJinyong WangHaibin ChuYan LiJie Liu
利用FePt/Au多层膜结构制备垂直磁记录L1_0-FePt薄膜被引量:3
2009年
利用磁控溅射方法在100℃的MgO单晶基片上制备了[FePt/Au]10多层膜,并研究了采用FePt/Au多层膜结构对FePt薄膜的有序化温度、矫顽力(HC)、垂直磁各向异性、晶粒尺寸以及颗粒间磁交换耦合作用的影响.磁性测试结果表明:FePt/Au多层膜在退火后具有较高的HC、良好的垂直磁各向异性、较小的晶粒尺寸且无磁交换耦合作用.截面高分辨电镜分析表明:Au可以缓解MgO和FePt之间较大的晶格错配,从而促进薄膜的垂直磁各向异性;同时,采用FePt/Au多层膜结构增加了FePt/Au界面能、应力能以及Au原子在薄膜中的扩散作用,促进了薄膜的有序化,从而有效降低了有序化温度,并且大幅度提高其HC.此外,Au原子部分扩散到FePt相的边界处,起到抑制FePt晶粒生长、隔离FePt颗粒的作用,从而显著降低了FePt晶粒的尺寸和颗粒间磁交换耦合作用.
冯春詹倩李宝河滕蛟李明华姜勇于广华
关键词:垂直磁各向异性
Linear Strain-Gradient Effect on the Energy Bandgap in Bent CdS Nanowires被引量:5
2011年
Although possible non-homogeneous strain effects in semiconductors have been investigated for over a half century and the strain-gradient can be over 1% per micrometer in flexible nanostructures, we still lack an understanding of their influence on energy bands. Here we conduct a systematic cathodoluminescence spectroscopy study of the strain-gradient induced exciton energy shift in elastically curved CdS nanowires at low temperature, and find that the red-shift of the exciton energy in the curved nanowires is proportional to the strain-gradient, an index of lattice distortion. Density functional calculations show the same trend of band gap reduction in curved nanostructures and reveal the underlying mechanism. The significant linear straingradient effect on the band gap of semiconductors should shed new light on ways to tune optical-electronic properties in nanoelectronics.
Qiang FuZi Yue ZhangLiangzhi KOUPeicai WuXiaobing HanXinli ZhuJingyun GaoJun XuQing ZhaoWanlin GuoDapeng Yu
关键词:CATHODOLUMINESCENCE
Effect of growth temperature on morphology,structure and luminescence of Tb-doped BN thin films
2009年
This paper investigates the effect of growth temperature on morphology, structure and photoluminescence (PL) of Tb-doped boron nitride (BN) films grown by magnetron sputtering, and the relationships of growth-temperature- structure-PL by scanning electron microscopy, transmission electron microscopy and PL. The characteristic emission lines of the Tb^3+ were observed in the PL spectra at room temperature. The 473-K-grown film is mainly consisted of amorphous BN particles. With the growth temperature increasing up to 1273 K, the amount of amorphous BN decreases, while the amount of turbostratic BN increases. Correspondingly, the PL intensities from the Tb^3+ ions increase with the increase of temperature in the range of 473 1273 K.
刘泉林于广华姜勇
关键词:PHOTOLUMINESCENCE
Preparation and properties of CdS/Au composite nanorods and hollow Au tubes被引量:1
2010年
1-dimensional (1D) metal-semiconductor nano-scale composite superstructures based on Au nanoparticles and CdS nanorods were prepared.The outer surface of CdS nanorods was modified with mercapto-ethylamine (MEA) in advance.With the aid of MEA,dense and uniform Au nanoparticles were deposited onto the external wall of CdS nanorods through in situ chemical reduction of AuCl4-ions.Those Au nanoparticles induced further electroless deposition and a continuous layer of Au was formed on CdS nanorods.Stable hollow Au tubes were obtained after the inner CdS cores were etched by HCl.UV-Vis,FL,XPS,EDX,TEM and SEM measurements were carried out to characterize the produced materials.The quenching of the defect emission of CdS in CdS-nanorod/Au-nanoparticle hybrid superstructures was detected,which was ascribed to the energy transfer from the exciton of CdS to surface plasma resonance level of Au.
YANG ZhaoHui CHU HaiBin JIN Zhong ZHOU WeiWei LI Yan
关键词:CDS纳米棒表面等离子体共振光电子能谱
Tapered dielectric structure in metal as a wavelength-selective surface plasmon polariton focuser
2009年
Symmetric tapered dielectric structures in metal have demonstrated applications such as the nanofocusing of surface plasmon polaritons, as well as the waveguiding of V-channel polaritons. Yet the fabrication of smooth-surfaced tapered structure remains an obstacle to most researchers. We have successfully developed a handy method to fabricate metal-sandwiched tapered nanostructures simply with electron beam lithography. Though these structures are slightly different from conventional symmetric V-shaped structures, systematic simulations show that similar functionality of surface plasmon polariton nanofocusing can still be achieved. When parameters are properly selected, wavelength- selective nanofocusing of surface plasmon polaritons can be obtained.
张洋赵清廖志敏俞大鹏
关键词:FOCUSING
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