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国家自然科学基金(51374132)

作品数:6 被引量:15H指数:2
相关作者:郝红霞邱东方张欣赵亚忠蔡广宇更多>>
相关机构:南阳师范学院教育部南阳理工学院更多>>
发文基金:国家自然科学基金河南省自然科学基金中国博士后科学基金更多>>
相关领域:理学一般工业技术金属学及工艺电子电信更多>>

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6 条 记 录,以下是 1-6
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Samarium doping improves luminescence efficiency of Cs_(3)Bi_(2)Br_(g)perovskite quantum dots enabling efficient white light-emitting diodes被引量:9
2021年
Considering the toxicity problem of lead-based perovskite quantum dots(PQDs),the lead-free Cs_(3)Bi_(2)Br_(g)PQDs has been recognized as one of the promising candidates.However,the low photoluminescence quantum yields(PLQYs)hinder its practical application in optoelectronic devices.Here,w e successfully prepared Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs with effective white light-emission by modified ligandassisted recrystallization method.The realization of white light-emission is attributed to the broadband blue emission of excitons and the red emission(^(4)G_(5/2)-^(6)HJ(J=5/2,7/2,9/2))of Sm^(3+)ions for Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs.More importantly,compared with the undoped Cs_(3)Bi_(2)Br_(g)PQDs,the PLQYs of Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs are improved from 10.9%to 20.8%,and the anti-water stability is also obviously improved.Finally,the Sm^(3+)ions doped PQDs based white light-emitting diodes(LEDs)with luminous efficiency of 12.6 lm/W were explored,which indicates that there is a potential prospect of lead-free PQDs in white light lighting application.
Yongsheng ZhuJinyang ZhuHaizhen SongJinshu HuangZhiwen LuGencai Pan
Structures, stabilities, and electronic properties of F-doped Sin (n=1~12) clusters:Density functional theory investigation
2013年
The geometries, stabilities, and electronic properties of FSin (n=1~12) clusters are systematically investigated by using first-principles calculations based on the hybrid density-functional theory at the B3LYP/6-311G level. The geometries are found to undergo a structural change from two-dimensional to three-dimensional structure when the cluster size n equals 3. On the basis of the obtained lowest-energy geometries, the size dependencies of cluster properties, such as averaged binding energy, fragmentation energy, second-order energy difference, HOMO–LUMO (highest occupied molecular orbital–lowest unoccupied molecular orbital) gap and chemical hardness, are discussed. In addition, natural population analysis indicates that the F atom in the most stable FSin cluster is recorded as being negative and the charges always transfer from Si atoms to the F atom in the FSin clusters.
张帅蒋华龙王萍卢成李根全张萍
聚集诱导发光分子在公共安全领域中的应用被引量:3
2022年
对于公共安全中存在的安全隐患及时检测和预防有助于保护公民的身体健康和财产安全。荧光检测技术以其优异的选择性、高的灵敏度、快的响应速度引起了广泛的研究。聚集诱导发光(AIE)材料作为一种与聚集导致发光猝灭(ACQ)材料截然相反的新兴有机荧光材料,实现了发光分子在固态或是聚集态下的高荧光量子产率。而独特的AIE特性,使其不必担心由于分子聚集导致的荧光信号的降低或猝灭,同时由于分子聚集程度的增加引起荧光颜色和强度的变化,可以被用来实现对靶标物的定性和定量分析,为荧光分析检测提供了新的思路和方案。目前基于AIE的荧光检测方法及相关技术已经被广泛应用各个领域,其中在公共安全领域的研究表现突出,并取得较高的研究成果。本文分析总结了近几年来AIE分子在公共安全领域中的应用进展,包括爆炸性物质、指纹识别、毒品检测、食品安全等方面,并对目前存在的问题和应用前景进行了总结和展望。
杜宪超邢小静程新峰邱东方郝红霞
关键词:公共安全聚集诱导发光荧光检测
常化温度对无取向电工钢50W300热轧板组织、织构和磁性能的影响被引量:1
2022年
利用电子背散射(EBSD-electronback-scattingdiffraction)检测分析技术和磁性能测量技术研究高牌号冷轧50W300无取向电工钢2.3mm热轧板低温(820℃)和高温(920℃)常化对其组织、织构和电磁性能的影响。研究发现,920℃2min(45m/min)常化时,电工钢成品的铁损最低,磁感最高。此时,电工钢卷外层晶粒组织发生脱碳并快速生长;次表层晶粒生长较为缓慢,晶粒尺寸较小,且均匀。中心层组织晶粒再结晶时,尺寸均匀。同时织构水平降低,表层织构慢散,次表层和中心层织构近似于冷轧织构,有利于电工钢磁性能的织构比例提高。
叶铁高振宇卢志文仲志国马春华
关键词:无取向电工钢常化织构磁性能
Mechanical and thermodynamic properties of the monoclinic and orthorhombic phases of SiC_2N_4 under high pressure from first principles
2014年
First principles calculations are preformed to systematically investigate the electronic structures, elastic and thermodynamic properties of the monoclinic and orthorhombic phases of Si C2N4 under pressure. The calculated structural parameters and elastic moduli are in good agreement with the available theoretical values at zero pressure. The elastic constants of the two phases under pressure are calculated by stress–strain method. It is found that both phases satisfy the mechanical stability criteria within 60 GPa. With the increase of pressure, the degree of the anisotropy decreases rapidly in the monoclinic phase, whereas it remains almost constant in the orthorhombic phase. Furthermore, using the hybrid density-functional theory, the monoclinic and orthorhombic phases are found to be wide band-gap semiconductors with band gaps of about 2.85 e V and 3.21 e V, respectively. The elastic moduli, ductile or brittle behaviors, compressional and shear wave velocities as well as Debye temperatures as a function of pressure in both phases are also investigated in detail.
苗楠茜濮春英何朝政张飞武卢成卢志文周大伟
流动性试验金属型模具设计及应用被引量:2
2018年
流动性差的合金铸造时难于充型,容易产生浇不足、冷隔等缺陷。为了测定合金在金属型中的流动性,专门设计了金属型流动性试验模具。该模具能一次测量合金在三种不同截面流道中的流动性,而且成本低,操作简便。用该模具测量了ZL101合金在不同条件下的流动性。结果能够反映浇注温度、模具温度和流道截面模数对流动性的影响规律。试验结果能为金属型铸造工艺和工装设计提供参考。
赵亚忠蔡广宇张欣班亚丰
关键词:流动性
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