有机薄膜电致发光无源矩阵显示

198 7年美国Ｋｏｄａｋ公司Ｔａｎｇ[1 ] 发表了以薄膜技术及低功函数金属电极为特征的有机薄膜电致发光器件 (ＯＬＥＤ)以来 ,因其发光亮度高、色彩丰富、低压直流驱动、制备工艺简单等在平板显示中具有潜在的应用 ,从而成为国际研究的热点。在不到十年的时间内 ,ＯＬＥＤ已经由研究进入产业化阶段。日本Ｐｉｏｎｅｅｒ[2 ] 、日本Ｓａｎｙｏ和美国Ｋｏｄａｋ[3] 、英国ＣＤＴ和日本Ｓｅｉｋｏ Ｅｐｓｏｎ[4] 等都已分别联合推出了ＯＬＥＤ矩阵显示器样机 ,而且宣称产业化[3] 。ＯＬＥＤ是一种全新的显示技术 ,其显示质量可与薄膜晶体管有…     

RIE技术制备p—n结型GaN蓝光LEDs

自从Ｓ．Ｎａｋａｍｕｒａ等人成功地制备了ＧａＮ／ＧａＩｎＮ／ＡｌＧａＮ蓝、绿光ＬＥＤｓ以来,ＧａＮ及其相关化合物的材料生长和器件工艺得到了广泛地研究．由于ＧａＮ材料不同于传统的Ⅲ－Ⅴ族化合物半导体材料,因此其器件的加工工艺,如欧姆或肖特基接触的形成、...     

低压MOCVD生长GaN p—n结蓝光LED

简要报道了采用一种改进的低压金属有机化物化学气相沉积（ＬＰ－ＭＯＣＶＤ）方法制备ＧａＮｐ－ｎ结蓝光光发射二极管（ＬＥＤ），介绍了ＬＥＤ的基本特性，这种ＬＥＤ具有良好的Ｉ－Ｖ特性和光谱特性，室温下，在正向电压５Ｖ，正向电流３－２０ｍＡ的条件下，峰值波长为依Ｍｇ的掺杂浓度和退火条件的不同而不同，分别在４２５ｎｍ，４３５ｎｍ和４８０ｎｍ附近，发射谱的半峰宽约为５０ｎｍ。     

SiO2-GeO2薄膜二次谐波产生的稳定性研究

利用溶胶－凝胶（ｓｏｌ－ｇｅｌ）方法制备了ＳｉＯ２－ＧｅＯ２薄膜,并测量了薄样品电场极化后光学二次谐波信号的相对大小和时间弛以豫特性,通过对汪同衬底材料及不同温度下电场极化薄膜样品二次谐波信号的时间弛豫特性比较,表明薄膜与衬底之间界面电荷的稳定性受衬底材料体电导率的影响,从而影响了薄薄膜样品二次谐波信号的稳定性。     

M_4S~(6 )(M=Cd,Zn)Clusters的电子结构和光谱性质的SCC-DV-X_α方法的计算研究

通过ＳＣＣ－ＤＶ－Ｘα方法对Ｍ４Ｓ６＋电子结构和光谱性质的计算研究得出Ｃｌｕｓｔｅｒｓ的第一吸收峰；同时，对Ｍ４Ｓ６＋的稳定性、电荷转移及轨道成分对ＬＵＭＯ和ＨＯＭＯ的影响进行了讨论。     

用LiF／Al作阴极的高效率有机发光器件

用ＬｉＦ／Ａｌ作阴极的高效率有机发光器件＊赵伟明刘祖刚唐春玖蒋雪茵张志林许少鸿（上海大学材料科学与工程学院，上海２０１８００）Ａｌ电极是非常好的接触材料，但是Ａｌ的高功函数（４．３ｅＶ）阻碍了它在有机发光二极管（ＬＥＤ）中的应用。近来，有报道在Ａｌ电...     

全彩色LED显示屏的色度计算

全彩色ＬＥＤ显示屏可以用来显示电视画面。目前没有专门用于ＬＥＤ彩色大屏幕的图像源及其标准,所以都是将送给ＣＲＴ显像管的图形信号源送到ＬＥＤ彩色大屏幕进行显示。针对把送给ＣＲＴ的信号送到ＬＥＤ屏进行显示会引起彩色失真这种情况,本文给出ＬＥＤ大屏幕系统的色度公式,为准确控制ＬＥＤ管的发光亮度提供理论依据,并给出产例。     

波长1O64nm脉冲激光高阈值反射膜的研制

研究 Ｈｆ Ｏ２／ Ｓｉ Ｏ２ 高反射膜的制备工艺及其激光诱导损伤阈值的比较测试,分别采用了反应蒸镀 Ｈｆ Ｏ２、反应离子辅助蒸镀 Ｈｆ Ｏ２、反应离子辅助蒸镀金属 Ｈｆ 的源材料形成 Ｈｆ Ｏ２ 薄膜。采用这三种工艺制备了 Ｈｆ Ｏ２ ／ Ｓｉ Ｏ２ 高反射膜,在中心波长 １０６４ｎｍ 处,反射率 Ｒ≥９９．５％ ,其中反应蒸镀 Ｈｆ Ｏ２ ／ Ｓｉ Ｏ２ 高反射膜损伤阈值最高,可达 ６０ Ｊ／ｃｍ ２（１０６４ｎｍ ,５ｎｓ）。     

M4S^6＋（M=Cd,Zn）Clusters的电子结构和光谱性质的SCC—D…

通过ＳＣＣ－ＤＶ－Ｘα方法对Ｍ４Ｓ＾６＋电子结构和光谱性质的计算研究得出Ｃｌｕｓｔｅｒｓ的第一吸收峰；同时，对Ｍ４Ｓ＾６＋的稳定性，电荷转移及轨道成分对ＬＵＭＯ和ＨＯＭＯ的影响进行了讨论。     

影响杂化钙钛矿太阳能电池稳定性的因素探讨

自从2009年首次报道采用有机-无机杂化钙钛矿作为吸光材料用于太阳能电池以来, 钙钛矿太阳能电池效率的快速提升引起了人们广泛的关注, 这类电池同时具有制备工艺简单、成本低廉等优点, 引发了钙钛矿电池的研究热潮. 目前研究工作大多数集中在如何提高电池的光电转化效率, 但钙钛矿电池要真正实现产业化应用, 急需要解决材料及器件的稳定性问题. 本文探讨影响钙钛矿材料及器件的稳定性因素, 从温度及湿度等方面分析了材料的稳定性, 从传输材料及其界面问题讨论了器件的稳定性.     

Theoretical study on optical and electronic properties of bis-dipolar 1,8-naphthalimide derivatives

A series of donor–π–acceptor type of 1,8-naphthalimide derivatives with ethylene as π-conjugated bridges have been designed to explore their optical and electronic properties as luminescent materials for organic light-emitting diodes (OLEDs). The frontier molecular orbital analysis turned out that the vertical electronic transitions of absorption and emission are characteristic as intramolecular charge transfer. The calculations showed that their optical and electronic behaviours are clearly affected by the aromatic substitute groups, but not significantly to the stability of molecules. The calculated results suggest that all the selected candidates are promising as luminescent materials for OLEDs.     

有机电致发光白光器件的研究进展

在十多年的时间里,有机电致发光二极管(Organic Lightemitting Diodes,OLEDs)的研究和应用取得了长足的进展。有机电致发光器件具有许多优点,例如:自发光、视角宽、响应快、发光效率高、温度适应性好、生产工艺简单、驱动电压低、能耗低、成本低等,因此有机电致发光器件极有可能成为下一代的平板显示终端。有机电致发光白光器件因为可以用于全彩色显示和照明,已成为OLED研究中的热点。介绍了有机电致发光白光器件的研究进展,按发光的性质将白光器件分为荧光器件和磷光器件两类,按发光层数将白光器件分为单层和多层器件,对相关材料、器件结构、发光机理等方面进行了讨论。     

聚芴类有机电致发光的材料和器件

综述了聚芴类有机电致发光领域中材料和器件的研究现况和展望.主要围绕有机电致发光的基本原理、近年来聚芴类有机电致发光的材料制备、器件改进情况和有机电致发光的应用前景三方面内容进行了评述.     

Combinatorial fabrication and screening of organic light-emitting device arrays

The combinatorial fabrication and screening of 2-dimensional (2-d) small molecular UV-violet organic light-emitting device (OLED) arrays, 1-d blue-to-red arrays, 1-d intense white OLED libraries, 1-d arrays to study Förster energy transfer in guest-host OLEDs, and 2-d arrays to study exciplex emission from OLEDs is described. The results demonstrate the power of combinatorial approaches for screening OLED materials and configurations, and for studying their basic properties.     

不同电极对蓝光有机电致发光器件性能的影响

利用高真空多源型有机分子沉积系统分别制备了不同负电极为Al、LiF/Al和Mg:Ag的有机小分子多层电致发光器件,比较了不同负极对以五苯基环戊二烯（PPCP）为发光层的蓝光有机电致发光器件性能的影响,发现以LiF/Al作负极的器件在综合性能上优于其它器件。其中器件ITO／TPD／PPDP／Alq/LiF/Al蓝光发射的最大发光亮度达2375cd/m^2,最大发光效率为0.26lm/W.     

Near infrared organic light-emitting diodes based on acceptor-donor-acceptor (ADA) using novel conjugated isatin Schiff bases

Fabrications of a single layer organic light emitting diodes (OLEDs) based on two conjugated acceptor-donor-acceptor (ADA) isatin Schiff bases are described. The electroluminescent spectra of these materials range from 630 to 700 nm and their band gaps were measured between 1.97 and 1.77 eV. The measured maximum external quantum efficiencies (EQE) for fabricated OLEDs are 0.0515% and 0.054% for two acceptor-donor-acceptor chromophores. The Commission International De L’Eclairage (CIE) (1931) coordinates of these two compounds were attained and found to be (0.4077, 0.4128) and (0.4411, 0.4126) for two used acceptor-donor-acceptor chromophores. The measured I-V curves demonstrated the apparent diode behavior of two ADA chromophores. The turn-on voltages in these OLEDs are directly dependent on the thickness. These results have demonstrated that ADA isatin Schiff bases could be considered as promising electroluminescence-emitting materials for fabrication of OLEDs.     

Considerable improvement in the stability of solution processed small molecule OLED by annealing

We investigated the annealing effect on solution processed small organic molecule organic films, which were annealed with various conditions. It was found that the densities of the spin-coated (SC) films increased and the surface roughness decreased as the annealing temperature rose. We fabricated corresponding organic light emitting diodes (OLEDs) by spin coating on the same annealing conditions. The solution processed OLEDs show the considerable efficiency and stability, which were prior or equivalent to the vacuum-deposited (VD) counterparts. Our research shows that annealing process plays a key role in prolonging the lifetime of solution processed small molecule OLEDs, and the mechanism for the improvement of the device performance upon annealing was also discussed.     

Development of organic light‐emitting diodes for electro‐optical integrated devices

Organic light‐emitting diodes (OLEDs) are discussed for electro‐optical integrated devices that are used for optical signal transmission. Organic optical devices including polymeric optical fibers are used for optical communication applications to realize polymeric electro‐optical integrated devices. The OLEDs were fabricated by vacuum process, i.e. the organic molecular beam deposition (OMBD) technique or a solution process on a polymeric or a glass substrate, for comparison. Optical signals faster than 100 MHz have been created by applying pulsed voltage directly to the OLED utilizing rubrene doped in 8‐hydoxyquinolinum aluminum (Alq₃), as an emissive layer. OLEDs fabricated by solution process utilizing rubrene doped in carrier‐transporting materials have also discussed. OLEDs utilizing polymeric materials by solution process are also fabricated and discussed. Moving‐picture signals are transmitted utilizing both vacuum‐ and solution‐processed OLEDs, respectively.     

互混型有机电致发光器件

通过共蒸镀空穴传输材料TPD和电子传输材料Alq₃,在普通双层器件的异质结界面引入了均匀互混层,并研究了互混层的厚度变化对器件光电性能的影响。互混层的引入在一定程度上改善了普通双层器件的异质结界面由于高浓度载流子积聚导致的高电场和界面缺陷对器件主要性能(效率和寿命)的负面影响。我们发现一定厚度的互混层使器件的性能有所提高。