共查询到20条相似文献,搜索用时 93 毫秒
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白光有机电致发光器件在显示和照明领域有着极大的应用前景,受到人们广泛的关注。本文对白光有机电致发光器件的结构、工作原理、工艺流程、存在的问题等进行了简单的概述,力求总结出制备白光有机发光器件的新途径。 相似文献
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有机发光显示被认为是下一代最理想的显示技术,具有自主发光、功耗小、视角宽、成本低和响应速度快等优点。本文在简述有机电致发光器件的电极结构和发光材料的基础上,重点介绍了有机显示器件的驱动技术和面板的研发成果,并展望未来发展的前景。 相似文献
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通过改进阳极和阴极,研制成功了高效顶部发光有机电致发光显示器件,为减少不必要的微腔效应,并获得广谱白光,涂镀CFx于银阳极上,以调整反射率,并在Ca/Ag阴极上涂折射率匹配材料(SnO2),获得最大透过率80%。基于蓝光和黄光发射体的双层结构的顶部发光白光有机电致发光器件在20mA/cm^2的电流密度下,在7.3V驱动电压下,最高电致发光效率达到22.2cd/A(9.61m/W)。CIE色坐标为(x=0.31,y=0.47)。 相似文献
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有机发光显示器具有自主发光、功耗小、驱动电压低、视角宽、响应速度快等优点,已成为平板显示技术新的研究热点.在介绍有机电致发光器件结构和发光原理基础上,系统介绍了有机显示器件的三个核心部分-有机发光材料、显示面板和驱动技术的研究进展,分析了有机发光显示器的市场前景及可能的应用领域,最后指出有机发光显示器在产业化进程中所需要解决的问题. 相似文献
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Ran Ding Feng‐Xi Dong Ming‐Hui An Xue‐Peng Wang Mo‐Ran Wang Xian‐Bin Li Jing Feng Hong‐Bo Sun 《Advanced functional materials》2019,29(12)
Organic single crystals with much higher carrier mobility and stability compared to the amorphous organic materials have shown great potential in electronic and optoelectronic devices. However, their applications in white organic light‐emitting devices (WOLEDs), especially the three‐color‐strategy WOLEDs, have been hindered by the difficulties in fabricating complicated device structures. Here, double‐doped white‐emission organic single crystals are used as the active layers for the first time in the three‐color‐strategy WOLEDs by co‐doping the red and green dopants into blue host crystals. Precise control of the dopant concentration in the double‐doped crystals results in moderately partial energy transfer from the blue donor to the green and red dopants, and thereafter, simultaneous RGB emissions with balanced emission intensity. The highest color‐rendering index (CRI) and efficiency, to the best of the authors' knowledge, are obtained for the crystal‐based WOLEDs. The CRI of the WOLEDs varies between 80 and 89 with the increase of the driving current, and the luminance and current efficiency reach up to 793 cd m?2 and 0.89 cd A?1, respectively. The demonstration of the present three‐color organic single‐crystal‐based WOLED promotes the development of the single crystals in optoelectronics. 相似文献
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《Electron Device Letters, IEEE》2002,23(7):401-403
Polymer dispersed liquid crystal (PDLC) is a promising liquid crystal for reflective displays in low power mobile applications. However, it is difficult to obtain full color PDLC displays. Color sequential PDLC is one solution but this requires short PDLC switching times. It is demonstrated that the PDLC switching times can be reduced to color sequential levels by changing the orientation of the electric field (field-oriented addressing). By choosing the right pixel geometry, this can be done at relatively low switching voltages compared to the classic addressing method which is based on changing the magnitude of the electric field 相似文献
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《Electron Devices, IEEE Transactions on》1971,18(9):733-738
Cholophors are passive polarization-switched color display elements suitable for use with lasers or white light. Their hybrid structure, consisting of a thin layer of cholesteric liquid crystal over a layer of photoluminescent phosphor, provides properties of particular interest for large-screen optically scanned multicolor display applications. Cholophors permit more efficient use of available laser power while providing a solution to the problem of color registration for two-primary displays and a partial solution for three-primary displays. Two-primary or Land-color displays can be obtained with only one color of laser light and three-primary displays with only two colors. A three-primary cholophor display using a single argon ion laser would have over 7 times the efficiency of a typical state-of-the-art system using an argon-krypton mixed-gas laser. The liquid crystal layer provides polarization selectivity, and the phosphor layer produces the additional color not furnished by the laser. The liquid crystal transmits one sense of laser polarization while totally reflecting the other, thereby permitting polarization selective excitation of the underlying phosphor. The color selection information is coded into the polarization of the incident laser beam. 相似文献
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I-Yin Li Jean-Fu Kiang 《Electron Devices, IEEE Transactions on》2008,55(2):533-539
Design constraints on field-sequential color liquid crystal displays (LCDs) are proposed and compared with those of conventional color filter LCDs. Application of these constraints to the design of LCD screens is demonstrated. 相似文献
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《Display Technology, Journal of》2008,4(3):290-295
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液晶盒边界效应对胆甾相液晶电控螺距的影响 总被引:1,自引:1,他引:0
研究了共面转换(IPS)液晶盒处于强锚定及弱锚定两种边界状态时横向电场与平面织构胆甾相液晶螺距的关系,探讨了液晶盒表面锚定对胆甾相液晶电控螺距的影响。理论结果表明,共面转换模式下电场可以调谐胆甾相液晶的反射光颜色,而边界锚定效应对电场调谐螺距有显著影响。这一结果为基于电控螺距原理的胆甾相液晶反射式彩色显示方案提供了理论上的依据。 相似文献
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Manipulation of Charge and Exciton Distribution Based on Blue Aggregation‐Induced Emission Fluorophors: A Novel Concept to Achieve High‐Performance Hybrid White Organic Light‐Emitting Diodes 下载免费PDF全文
Baiquan Liu Han Nie Xingbang Zhou Shiben Hu Dongxiang Luo Dongyu Gao Jianhua Zou Miao Xu Lei Wang Zujin Zhao Anjun Qin Junbiao Peng Honglong Ning Yong Cao Ben Zhong Tang 《Advanced functional materials》2016,26(5):776-783
The aggregation‐induced emission (AIE) phenomenon is important in organic light‐emitting diodes (OLEDs), for it can potentially solve the aggregation‐caused quenching problem. However, the performance of AIE fluorophor‐based OLEDs (AIE OLEDs) is unsatisfactory, particularly for deep‐blue devices (CIEy < 0.15). Here, by enhancing the device engineering, a deep‐blue AIE OLED exhibits low voltage (i.e., 2.75 V at 1 cd m?2), high luminance (17 721 cd m?2), high efficiency (4.3 lm W?1), and low efficiency roll‐off (3.6 lm W?1 at 1000 cd m?2), which is the best deep‐blue AIE OLED. Then, blue AIE fluorophors, for the first time, have been demonstrated to achieve high‐performance hybrid white OLEDs (WOLEDs). The two‐color WOLEDs exhibit i) stable colors and the highest efficiency among pure‐white hybrid WOLEDs (32.0 lm W?1); ii) stable colors, high efficiency, and very low efficiency roll‐off; or iii) unprecedented efficiencies at high luminances (i.e., 70.2 cd A?1, 43.4 lm W?1 at 10 000 cd m?2). Moreover, a three‐color WOLED exhibits wide correlated color temperatures (10 690–2328 K), which is the first hybrid WOLED showing sunlight‐style emission. These findings will open a novel concept that blue AIE fluorophors are promising candidates to develop high‐performance hybrid WOLEDs, which have a bright prospect for the future displays and lightings. 相似文献
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High luminous efficiency and high color rendering index (CRI) are both the foremost factors for white organic light-emitting diodes (WOLEDs) to serve as next generation solid-state lighting sources. In this paper, we show that both luminous efficiency and CRI can be improved by adjusting the green/red spectra of WOLEDs. With green emission spectra matching with the human photopic curve, the WOLEDs exhibit higher luminous efficiency and higher CRI. Theoretical calculation shows that by tuning the white emission spectra to maximally match with the human photopic curve, the luminous efficiency can be improved by 41.8% without altering the color coordinates, the color correlated temperature (CCT) and the external quantum efficiency (EQE) of the WOLEDs. 相似文献