共查询到20条相似文献,搜索用时 161 毫秒
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PPV/ZnS薄膜器件发光及电导的研究 总被引:1,自引:0,他引:1
以Ⅱ-Ⅵ族无机半导体ZnS替代双层有机薄膜电致发光器件的电子传输层,以PPV为空穴传输层和发光层制备发光器件,得到发光亮度和效率都比单层PPV器件高的电致发光器件。器件结构为ITO/PPV/ZnS/Al。器件的电致发光光谱同单层PPV器件的光说基本相同,但启亮电压只有4.5V,亮度也比单层器件高一个量级。通过PPV层自吸收现象可塑料出发光区域在PPV/ZnS界面处。器件的电流密度与电压的二次方式线 相似文献
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Ⅱ-Ⅵ族半导体纳米晶与聚合物的复合物在光电器件领域的应用近年来成为国内外研究的热点。综述了近几年来半导体纳米晶/共轭聚合物在有机/无机复合电致发光器件和太阳能电池方面的应用进展情况,着重强调了其发展历程,并对其存在的问题进行了分析,展望了其发展前景。 相似文献
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稀土离子注入的硅材料MOS结构高效率电致发光器件 总被引:1,自引:0,他引:1
本文介绍了在稀土离子Re(Re=Er、Eu、Tb、Ce和Gd)注入的SiO2金属-氧化物-硅(MOS)结构高效率电致发光器件的研究进展情况。通过将不同的稀土离子注入到SiO2薄膜,相继获得了发射光谱峰值分别位于红外(1.54μm)、可见光(618 nm5、43 nm、440 nm)至紫外(316 nm)光谱范围的MOS结构电致发光器件,并系统研究了SiO2:Re薄膜中稀土离子的电致发光特性。在SiO2:Re有效发光层的厚度为50 nm,掺杂浓度为1-3%的条件下,稀土Er、Tb和Gd离子注入掺杂的硅材料MOS结构电致发光器件在红外、绿光和紫外的量子效率分别达到14%、16%和5%,接近了商品化III-V族半导体发光二极管的水平。 相似文献
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聚合物电致发光材料的研究现状及应用前景 总被引:3,自引:0,他引:3
聚合物电致发光材料是近几年来取得很大进展而倍受关注的新型功能材料。电致发光薄膜器件激发电压低、发光效率高、易得到彩色显示 ,而且容易实现大屏幕平板化。本文综述这类薄膜电致发光器件的发光原理、发光材料、器件的制备方法以及改善器件特性的方法 相似文献
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针对有机电致发光器件在显示器领域内的蓬勃发展和广泛应用,本论文对有机电致发光器件封装材料的制备进行了分析研究,首先分析介绍了有机电致发光的优点以及常用的封装方法,在此基础上重点探讨了封装材料的制备工艺,给出了防潮等关键技术措施,对于进一步提高有机电致发光器件封装材料的制备工艺水平具有一定借鉴指导意义。 相似文献
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<正>LED(Light Emitting Diode)是一种借外加电压激发电子而发光的光电半导体组件,其基本结构是将一块电致发光器件置于一个有引线托架上,四周用环氧树脂密封并保护内部芯线。 相似文献
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广泛用于电致发光器件测量的装置及其自动化控制 总被引:1,自引:0,他引:1
通过Vb程序平台编制了一套控制及数据处理系统,对测量电致发光器件的装置进行了自动化程序控制,使用户可以极为方便的获取不同偏压下电致发光器件的Ⅳ特性曲线及光学参数.该套系统已成功地用于中科院理化所、化学所,中国电子科技大学,北京大学等单位,是一种广泛用于评价电致发光器件的系统方案. 相似文献
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通过Vb程序平台编制了一套控制及数据处理系统,对测量电致发光器件的装置进行了自动化程序控制,使用户可以极为方便的获取不同偏压下电致发光器件的IV特性曲线及光学参数。该套系统已成功地用于中科院理化所、化学所,中国电子科技大学,北京大学等单位,是一种广泛用于评价电致发光器件的系统方案。 相似文献
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有机/高分子电致发光器件是当前国内外平板显示器技术领域的研究热点,8-羟基喹啉金属配合物(8HQM)以其优良的电致发光性能成为研制高效率的有机/高分子电致发光器件的首选材料.针对近十年来8HQM电致发光材料的研究状况,对其电致发光机制、分子结构及发光性能的关系、分子种类及其最新研究进展,进行综述,展望了其发展趋势. 相似文献
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蒸发式冷凝器发展和应用 总被引:26,自引:0,他引:26
本文介绍了冷凝器型式特点及应用现状,比较了不同型式的冷凝器,着重阐述了蒸发式冷凝器的结构、原理及其优点,分析了蒸发式冷凝器的发展及应用现状,总结了蒸发式冷凝器使用中存在的问题并提出了解决问题的方法,展望了蒸发式冷凝器的发展方向和应用前景。 相似文献
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Summary In this paper, a simple layer potential and a double layer potential are suggested to solve the curved crack problem. The
complex potentials in the simple layer case are formulated on the distributed dislocation along the curve. Meantime, the complex
potentials in the double layer case are formulated on the crack displacement opening distribution. Behaviors of the complex
potentials, for example the behaviors of increments of some physical quantities around a large circle, are analyzed in detail.
Continuity and discontinuity of some physical quantities in the normal direction of the curve are analyzed, which are key
points for formulating the integral equations of the problems. One weaker singular, two singular and one hypersingular integral
equations are suggested to solve the problems. The relations between the kernels in different integral equations are addressed.
Similarly, a simple layer potential and a double layer potential are suggested to solve the curved rigid line problem. The
complex potentials in the simple layer case are formulated on the distributed forces along the curve. Meantime, the complex
potentials in the double layer case are formulated on the resultant force function. One weaker singular, two singular and
one hypersingular integral equations are suggested to solve the problems. When the resultant forces and moment are applied
on the deformable line, the constraint equations are suggested. For more general cases, for example, in the case that the
tractions applied on the two crack faces are not same in magnitude and opposite in direction, a singular integral equation
is suggested. The equation is obtained by a superposition of two kinds of single layer potentials. 相似文献
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Jean Spitz 《Thin solid films》1977,45(1):31-41
High performance, low cost, selective surfaces which are chemically and thermally stable are a key limiting problem in the development of the thermal applications of solar energy. This review deals with selective coatings that withstand high temperatures. After indicating the comparative advantages of selective over black-body absorbers, the different ways of generating selectivity are briefly investigated. The physicochemical requirements that must be met, in addition to the specific optical properties that are needed, are established, and criteria for the choice of materials are given. Finally several examples of selective surfaces are described and some trends for further research in the field are discussed. 相似文献
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叙述了复合材料用于建筑物加固修复的重要性、优越性和应用前景。在分析大量文献资料的基础上,结合作者近期的研究工作,归纳并阐述了建筑物加固修复用复合材料技术的主要内容。较详细地介绍了加固修复用复合材料增强体技术与树脂体系技术,给出了多种纤维片材的特性,提出了相应树脂体系的工艺要求与性能要求。同时,对复合材料-混凝土界面粘结机理作了分析。联系国内情况,提出了该领域亟待开展的研究工作。 相似文献
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The factors causing problems in sputter deposition of thin films are analysed and possible design solutions are offered. ZnO sputtered films are used as a probe for studying problems. The physical parameters of the discharge that have influence on the sputtering processes are described and related to the sputtering parameters. A comparison of discharges used in Diode, Magnetron, and Triode arrangements with respect to their system performances results in the conclusion that Magnetrons are superior to Diodes and that Triodes are better than Magnetrons, in spite of the fact that Triodes' discharges are of the supported kind and their deposited layers are difficult to reproduce. 相似文献
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Camera calibration is a two-step process where first a linear algebraic approximation is followed by a nonlinear minimization. The nonlinear minimization adjusts the pin-hole and lens distortion models to the calibrating data. Since both models are coupled, nonlinear minimization can converge to a local solution easily. Moreover, nonlinear minimization is poorly conditioned since parameters with different effects in the minimization function are calculated simultaneously (some are in pixels, some in world coordinates, and some are lens distortion parameters). A local solution is adapted to parameters, which minimize the function easily, and the remaining parameters are just adapted to this solution. We propose a calibration method where traditional calibration steps are inverted. First, a nonlinear minimization is done, and after, camera parameters are computed in a linear step. Using projective geometry constraints in a nonlinear minimization process, detected point locations in the images are corrected. The pin-hole and lens distortion models are computed separately with corrected point locations. The proposed method avoids the coupling between both models. Also, the condition of nonlinear minimization increases since points coordinates are computed alone. 相似文献