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1.
WANG Dong-ming Zhang Bu-xin SUN Ling-ling JIANG Xue-yin ZHANG Zhi-lin XU Shao-hong MA Chang-qi WANG Jian-hua ZHANG Bao-wen School of Material Science Engineering Shanghai University Shanghai China Institute of Photographic Chemistr 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionOrganic electrolUminescent (EL) devices have beenexpected tO serve as a new ace of flat display since Tangand co-workerS first reposed high-perfonnance orgallicEL devices.["2] Their success was based on a multilayerstrUctUre which had an emitting layer and a caberdisPOrting layer. F~rmore, Adachi and co-workersdeVeloped the multilayer strUctUre and Proposed threefimdamental strUctUres for orghoc EL devices, namelythe single hetero-A (SH-A), single hetero-B (SH-B) andd… 相似文献
2.
Three types of blue-violet light-emitting devices based on an exciton-confined structure have been prepared, in which different materials were used as emitting layers and hole-transporting layers. They had structures of ITO/CuPc/NPB/CPB/TPBi/Alq3/LiF/Al(DNC), ITO/CuPc/JO3/CBP/TPBi/Alq3/LiF/Al(DJC ) and ITO/CuPc/JO3/FNPD/TPBi/Alq3/LiF/Al(DJF). Here copper phthalocyanine (CuPc) acted as hole-injecting layer( HIL), N, N-bis-(1-naphthyl)-N, N-diphenyl-1. lbiphenyl-4-4-diamine(NPB) and J03 bole-transporting layers ( HTLs), 4,4‘-dicarbazolyl-1,1‘ -biphenyl (CBP) and FNPD as emitting layers( EMLs), N, arylbenzimidazoles (TPBi) as holeblocking layer ( HBL ), and tris(8-quinolinolato ) aluminium complex ( Alq3 ) as electron- transporting layer ( ETL). TPBi applied here is a good confinement to both charges and excitons, which make the devices emit blue-violet light originating from the emitter, CBP and FNPD. Their characteristics have also been investigated. The result shows that the device DNC based on NPB/CBP has the best performance among the three devices. The excellence of DNC is attributed to the better hole-transporting ability of NPB as compared with J03, and the better emitting ability of CBP as compared with FNPD, although the best matching of energy levels is found in the hole-transporting layer and emitting layer of the device DJP. 相似文献
3.
Two types of molecular and polymer devices employing (2-(4′-biphenyl)-5-(4““““““““-tert-butylphenyl)-1,3,4-oxadiazole) (PBD)and poly(N-vinylcarbazole) (PVK) as electron transport and hole transport materials, respectively, have been fabricated. The structures of these two devices are ITO/PVK( 70 nm)/PBD(60 nm)/A1 and ITO/PVK: PBD (1:1 by mass, 70 nm)/A1. The formation of exciplex is evident by comparing the electroluminescence (EL) of a bi-layer device and the photoluminescence (PL) of a PVK and PBD mixed film.The maximum emission energy of exciplex evaluated is consistent with the peak emission of EL. Blue emissions from both devices are obtained. The type of exicplex is interpreted based on the energy level diagram of the bi-layer device. 相似文献
4.
采用真空热蒸镀法,以热活化延迟荧光(TADF)材料为主体材料、发光材料为客体材料制备混合薄膜发光层,以提高蓝色荧光材料的OLED发光效率。当OLED器件结构为ITO/HAT-CN(5 nm)/TAPC(30 nm)/TCTA(10 nm)/Blue-Or:DMAC-DPS(30%,30 nm)/DPEPO(10 nm)/Bphen(30 nm)/LiF(1 nm)/Al(70 nm)时,器件的光电性能最佳。此蓝光TADF-OLED器件的外量子效率为12.39%,电流效率为21.68 cd/A,功率效率为19.44 lm/W。研究发现改变TADF-OLED的掺杂主体材料和添加空穴注入层均可有效地提高器件的光电特性。实验内容与该领域的前沿科学研究相结合,OLED器件的光电性能稳定、实验现象显著,适于引入本科实验课程。通过该综合实验学生可以夯实实验基础、了解研究热点、掌握最新的科研动态。 相似文献
5.
杨惠山 《泉州师范学院学报》2008,26(6):34-36
制备了利用KCl／Al作为负电极的有机电致发光器件,器件结构为IT0／NPB／Alq／KCl／Al,KCl层的加入增强了电子注入,当其厚度为1．5nm时,器件的性能最好．与单层Al电极的同类器件相比,此时器件的开启电压由Al电极时的5V降低到了2．5V。器件的亮度在11V时由231cd／m^2提高到15070cd／m^2,器件的发光效率也增加了10倍,达到2．79cd／A． 相似文献
6.
A new blue electroluminescent material,distyrylarylene(DSA)derivative,4,4‘-bis[2,2-(1-naphthyl,phenyl)vinyl]-1,1-biphenyl(NPVBi)is designed and synthesized.The DSA derivative shows better thermal stability because of its high glass transition temperature.A blue organic light emitting diode(OLED0with the structure ITO/TPD/NPVBi/Alq/LiF/Al is studied.The electroluminescent(EL0spectrum of the OLED exhibits that light emission originates from NPVBi with a peak at 460nm,its Commission Internationale de l‘Eclairage(CIE)color coordinates are x=0.16,y=0.15,and showing independence of CIE color coordinates on current density.The new DSA derivative is expectable as a new candidate for blue light emitter in OLEDs. 相似文献
7.
In order to compare two kinds of blue electroluminescent materials,we have investigated two kinds of blue OLEDs with the similar structure ITO/CuPc/NPB/JBEM:perylene/Alq/Mg:Ag[device(J)] and ITO/CuPc/NPB/DPVBi:perylene/Alq/Mg:Ag[device(D)].The difference of luminance and efficiency was not obvious for the two devices,However,there was remarkable difference for their lifetime.The device(J) achieved longer half lifetime of 1035h at initial luminance of 100 cd/m^2,and that of device(D) was only255h,According to their energy level diagrams,the differentce of their stability may originate from different host materials in the two devices.It may be attributed to the better thermal stability of JBEM molecues than that of DPVBi.It is shown that JBEM may be a promising blue organic electroluminescent material with great stability. 相似文献
8.
金属Yb兼具功函数低、透光度高和化学稳定性相对较高等优点,非常适合作为有机顶部发光器件(TEOLED)的透明阴极材料。计算表明:TEOLED阴极层中加入金属Yb可以有效地抑制器件工作过程中产生的表面等离子体激元振荡(SPs),从而提高器件的相关性能。本文比较性地研究了两种阴极层不同(Yb/Yb:Au和Yb/Yb:Ag)、结构相同(ITO/NPB/Alq3/阴极)的TEOLED。结果表明,直接利用Yb:Au或Yb:Ag共沉积层作为透明阴极的TEOLED的透光度很高,但其电子注入能力较差、发光效率较低;而在Yb:Ag(或Yb:Au)共沉积层和Alq3层之间插入厚度适当的Yb层后,虽然透光度略有下降,但其发光效率得到了显著的提高。 相似文献
9.
杨惠山 《泉州师范学院学报》2008,26(2):44-48
制备一种利用4,4’,4＂-tris（3-methylphenylphenylamino）-triphenylamine（m—MTDATA）作为空穴注入缓冲层的器件．m—MTDATA增加部分从阳极ITO注入到有机层NPB的空穴,从而平衡了空穴和电子的注入．有缓冲层的有机发光器件比没有缓冲层有机发光器件的电流效率有了明显的提高．当缓冲层m-MTDA—TA为25nm时,最大电流效率在7V时达到3．15cd／A．是没有缓冲层器件电流效率的近3．5倍． 相似文献
10.
1Introduction Sincethefirstreportofefficientorganiclightemit tingdevices(OLED)byTang[1],OLEDshavebeen emergingastheleadingcandidateforthenextgenera tionplat paneldisplaysduetotheiradvantagessuchas fastresponsetime,largeviewingangle,highbright ness,lowoperatingvoltageandverythinthickness.Generally,theemissioncolorsoflayeredOLEDscan beabtainedbyselectingfluorescentmaterialswithdif ferentenergylevelsgapordopingtheorganicfilms withhighlyefficientfluorescentdopants.Sometimes,foracertaincombina… 相似文献