Organic Electroluminescence Using TPD as the Emitting Layer

Organic electroluminescent thin film using TPD as an emitting layer with structure of Glass/ITO/TPD/Al is fabricated. Its V-I curve, V-B curve and electroluminescent spectra are measured and analysed.The blue emission with luminance of 0.74 cd/m 2 and luminous efficiency of 1.35×10 -3 lm/W is achieved at DC voltage of 24 V.     

Efficient Organic Multi—quantum Well Electroluminescent Devices Using Aluminum as Cathodes

Organic green light emitting devices(LEDs)with multi-quantum well(MQW)structure were fabricated.Aromatic diamine(TPD)was used as holetransporting layer and potential barrier layer;Tris(8-hydroxyquinoline)aluminunum(Alq3)was acted as electron-transporting emitter and MQW green emitter.Airstable aluinum(Al)was used as electron-injection contact.The influence of the thickness of potential barrier layer and the number of quantum well on the electroluminescent(EL)efficiencies of the devices was investigated.The organic LEDs with two quantum wells showed enhanced EL efficiencies.Maximum external quantum efficiency and brightness were 1.04% and 7000cd/m^2,respectively.     

Tris（8—Hydroxyquinoline）Aluminum／2—（4—Biphenylyl）—5—（4—Tertbutylphenyl）—1,3,3—O—xadiazole Organic Multiple Quantum Wells for Electroluminescent Devices

Organic multiple quantum wells(OMQWs) consisting of alternating layers of organic materials have been fabricated from tris(8-hdroxyquinoline) aluminum(Alq)and 2-(4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,3-oxadiazole(PBD)by a multisource-type high-vacuum organic molecular deposition.From the small-angle X-ray diffraction patterns of Alq/PBD OMQWs,a periodically layered structure is confirmed through the entire stack.The Alq layer thickness in the OMQWs was varied from 1 nm to 4 nm.From the optical aborption, photoluminescence and electroluminescence measurements,it is found that the exciton energy shifts to higher energy with decreasing Alq layer thickness,The changes of the exciton energy could be interpreted as the confinement effects of exciton in the Alq thin layers.Narrowing of the emission spectrum has also been observed for the electroluminescent devices(ELDs)with the OMQWs structure at room temperature.     

Control of the Interface between Tris（8—quinolinolato）Aluminium and Aluminum Layers in an Organic Electroluminescent devices

A bilayer Al2O3/Al is used as a cathode for organic electroluminescent devices,Six times higher electroluminescent efficiency is obtained without increasing the threshold voltage.The improvement is believed to be due to increasing injecting electron density,which improves the balanced injection of carriers,and declines the exciton-quenching and carrier-trapping centers that are intrinsic to the interface between of emitting layer and catode.     

稀土有机配合物电致发光器件的研究进展

概述了稀土有机配合物电致发光薄膜器件的材料、结构、发光机理以及目前研究的状况、出现的问题和研究的发展趋势.     

ZnS：Mn交流薄膜电致发光陶瓷灯

报道了一种直接用５０Ｈｚ，２００Ｖ市电驱动的ＺｎＳ：Ｍｎ薄膜电致发光器件，使用高介电常数，低损耗的反铁电陶瓷片作为器件的绝缘层，同时也作为器件的基片，它具有功耗低，亮度较高，呈薄片状国经，性能稳定，寿命长耐压高，使用安全可靠等优点，是新一代的节能型中等亮度的平面显示器件。     

有空穴传输层的双层有机薄膜电致发光器件

制备了由有机空穴传输层和有机发光层组成的双层有机薄膜电致发光器件,器件的发光亮度相对于单层器件有了很大的提高。并用不同深度区域的掺杂方法,对其电致发光机理作了探讨。对单、双层器件的不同的亮度电流关系、不同的发光区域进行了分析和讨论.     

有机电致发光薄膜的电流输运机理的分析

用TPD作空穴传输层、8－羟基喹啉锌作发光层,制备了有机薄膜器件,测量了其电致发光特性。分析了该器件的电流输运机理,认为该有机薄膜器件在电致发光时流过器件的电流受热电子注入效应、空间电荷限制效应、隧穿效及器件电阻效应的影响。     

两种不同结构及掺杂的白色有机发光二极管

白色有机发光器件由于在其上加彩色滤光片可容易地达到全彩效果而备受关注,本文通过两种不同结构及掺杂的器件,实现了白色有机电致发光,一种为具有空穴锁定层并在其中掺杂的器件;另一种为蓝色染料和红色染料分别加在发光层与电子传输层中的普通3层结构器件。结构分别为ITO／NPB／TPBi;Rubrene/Alq/Mg;Ag和ITO/NPB/DPVBi;Perylene/Alq :DC JTB/Mg:Ag。具有空穴锁定层的器件和普通型器件的最大亮度、最大流明效率、色度分别为8635cd/m^2、0.851m/W、（x=0.31,y=0.32)10倍,空穴锁定层的器件寿命远小于普通型的。此文对此差异进行了分析。     

新型交流薄膜电致发光器件的研究

本文介绍了根据加速电子,激发中心在空间上分开,利用低场预热和高场加速的设想,设计并研制的一种新型交流薄膜电致发光器件。     

薄膜电致发光器件中电子的输运规律

本文用Monte Carlo法,研究了电场、温度和带电中心对薄膜电致发光器件中电子输运过程的影响。随着电场的增加以及温度的带电中心浓度的降低,电场对电子的加速效果将更加显著。     

Eu3+配合物红色有机电致发光器件

合成了一种新型的Ｅｕ＾３＋配合物－Ｅｕ（ＢＡ）２（ＭＡＡ）（Ｐｈｅｎ）,并将其作为红光发射材料制备了结构为Ｇｌａｓｓ／ＩＴＯ／Ｅｕ（ＢＡ）２（ＭＡＡ）（Ｐｈｅｎ）／Ａ１ｒ的有机电致发光薄膜器件。这种材料具有很强的荧光和很好的单色性且比较强的电致发光。器件的开戾电压为１２Ｖ。在电压为２６Ｖ的正向驱动下,器件的亮度为１５ｃｄ／ｍ＾２,发光效率为０．２５１ｍ／Ｗ。结合测量粉末、薄膜状态下的荧光光谱、激发     

8-羟基喹啉锂蓝色有机电致发光器件

合成了蓝色有机薄膜电致发光材料8-羟基喹啉锂(Liq),8-羟基喹啉锂薄膜的PL光谱峰位于475nm^2分析了8-羟基喹啉锂发射光谱蓝移的原因^2制备了两种结构的蓝色发光器件,其最高亮度分别为1200cd／m^2和2000cd／m^2,EL峰位于490nm^2用能级图比较和分析了两种器件的特性。