利用PtOEP掺杂改善Spiro发光器件的发光效率

为了利用有机三线态发光提高有机发光器件的发光效率,用磷光材料掺杂到聚合物主体中作为发光层,制备有机电致发光器件.在测量器件的电流-电压特性、发光亮度-电压特性和电致发光谱的基础上,计算了器件的外量子效率,研究了磷光材料的掺杂浓度对器件发光效率的影响.结果表明,对特定的材料体系,适当控制掺杂浓度,可以同时观察到荧光和磷光光谱,使掺杂器件的外量子效率在纯聚合物发光器件的基础上得到明显提高.     

压力对Zr46.75Ti8.25 Cu7.5Ni10Be27.5大块非晶合金玻璃转变和晶化动力学的影响

利用X射线衍射和差示扫描量热分析研究了高温高压下Zr46.75Ti8.25Cu7.5Ni10Be27.5大块非晶合金的玻璃转变和晶化行为,结果发现压力降低了该大块非晶合金中的自由体积、热焓和晶化激活能.     

Lyot型双折射调谐滤光片特性研究

本文利用 Muller矩阵和 Stoks参量 ,从理论上分析 L yot可调双折射滤光片的透射率、通带半宽度等性能 ,并首次讨论了λ/ 4波片的精度对滤光片性能的影响。分析结果表明 L yot双折射调谐滤光片具有较好的可调性 ,可调范围较宽 ;λ/ 4波片的精度不会对滤光片的通带半宽度产生影响 ,但能引起透射光谱的移动。     

The effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors

We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron-hole pairs,and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field.The field dependence,the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron-hole pairs.The simulated magnetoresistance shows good consistency with the experimental results.     

压力对Zr46.75Ti8.25Cu7.5Ni10Be27.5大块非晶合金玻璃转变和晶化动力学的影响

利用X射线衍射和差示扫描量热分析研究了高温高压下Zr_46.75Ti_8.25Cu_7.5Ni₁₀Be_27.5大块非晶合金的玻璃转变和晶化行为，结果发现压力降低了该大块非晶合金中的自由体积、热焓和晶化激活能. 关键词： 大块非晶合金 高压 差示扫描量热分析 玻璃转变     

利用PtOEP掺杂改善Spiro发光器件的发光效率

为了利用有机三线态发光提高有机发光器件的发光效率,用磷光材料掺杂到聚合物主体中作为发光层,制备有机电致发光器件.在测量器件的电流-电压特性、发光亮度-电压特性和电致发光谱的基础上,计算了器件的外量子效率,研究了磷光材料的掺杂浓度对器件发光效率的影响.结果表明,对特定的材料体系,适当控制掺杂浓度,可以同时观察到荧光和磷光光谱,使掺杂器件的外量子效率在纯聚合物发光器件的基础上得到明显提高.     

液晶调谐滤光片的设计

利用液晶的电光效应设计了液晶调谐滤光片,从实验结果上分析了其调谐性能,发现它具有较宽的调谐范围、较高的透射比、通带并宽度小、调谐电压较低等优点。     

Micropolarizer of Ordered Ni Nanowire Arrays Embedded in Porous Anodic Alumina Membrane

A micropolarizer of nickel nanowire arrays within an anodic alumina membrane(AAM) was fabricated by anodization of pure Al and electrodeposition of Ni,resperctively,X-ray diffraction,scanning electron microscopy and transmission-electron microscopy reveal that the nanowires are polyscrstal and have an average diameter of 70nm.Spectrophotometer measurements show that the nickel nanowire arrays embedded in the AAM can only transmit polarized light vertical to the wires.An extinction ratio of 25 to 30dB and an average insertion loss of 1.07dB in the wavelength range of 1-2.5um were obtained ,respectively.Thus,Ni nanowire/AAM can be used as a wire grid type micropolarizer.