8-羟基喹啉两亲配合物的LB膜及其电致发光器件研究

制备了两亲配体N-十六烷基-8-羟基-2-喹啉甲酰胺(HL)十个配合物的LB膜。采用π-A等温线和小角X射线衍射等方法研究了这些LB膜的性质和结构。两亲配合物的单分子占有面积为(1.25±0.06)nm^2和(0.75±0.06)nm^2,分别对应于两亲分子中两个喹啉环平躺和环与环之间以一定的角度倾斜于气/水界面。LB膜内分子排列是二维有序的超晶格结构,双层高度(5.0±0.1)nm;LB膜具有导电各向异性,其平面和垂直直流电导率分别为10^-^5S.m^-^1和10^-^9S.m^-^1;LB膜的高荧光性质使之可以用作为电致发光器件的发光材料。以LaL~2(H~2O)~4Cl的LB膜为发光层的单层电致发光器件的驱动电压为9V,发光亮度330cd/m^2,为黄绿色发光。     

2-对联苯-8-羟基喹啉锌的合成及其应用于新型白光OLED

合成了一种全新的有机发光材料2-对联苯-8-羟基喹啉锌(Zn[2-(p-biPh)-8-Q-O]₂), 通过¹H NMR, UV-Vis等对配合物的结构进行表征. 利用该材料制备了新型白光有机电致发光器件(OLED), 其结构为: ITO/NPB (N,N'-双(1-萘基)-N,N'-二苯基-1,1'-二苯基-4,4'-二胺)/BCP (2,9-二甲基-4,7-二苯基-1,10-菲咯啉)/Zn[2-(p-biPh)-8-Q-O]₂/Al. 通过调节空穴阻挡层BCP的厚度, 实现了NPB(蓝光发射)和Zn[2-(p-biPh)-8-Q-O]₂(黄光发射)作为器件双发光层的有效复合, 并研究了其发光机理. 当BCP层的厚度为2.0 nm时, 获得了稳定的白色发光; 该器件在6 V电压下启亮, 20 V电压时最大发光亮度达到130 cd/m², 电流效率为0.224 cd/A.     

基于N-对甲氧苯基咔唑-2-乙烯基-8-羟基喹啉锌的白色和黄色有机电致发光器件的性能

通过研究新型荧光染料N-对甲氧苯基咔唑-2-乙烯基-8-羟基喹啉锌(MoBCzHQZn)的电致发光(EL)特性, 发现MoBCzHQZn具有较强的发光特性和空穴传输特性, 利用此特性制备了非掺杂型的有机电致白光器件和掺杂型的有机电致黄光器件. 白光器件的结构为ITO/2T-NATA(20 nm)/MoBCzHQZn(25 nm)/NPBX(13 nm)/BCP(8nm)/Alq3(34 nm)/LiF(0.5 nm)/Al, 器件在15 V电压下实现了白光发射, 色坐标为(0.3719, 0.3275), 最大发光亮度为3414 cd·m-2, 在14 V 电压下的最大发光效率为1.69 cd·A-1、黄光器件的结构为ITO/2T-NATA(20 nm)/CBP:6%Ir(ppy)3:10%MoBCzHQZn(25 nm)/TPBi:6%Ir(ppy)3(47 nm)/LiF(0.5 nm)/Al, 器件在15 V电压下实现了黄绿光发射, 色坐标为(0.3590, 0.5787), 最大发光亮度为11073 cd·m-2, 在9 V电压下的最大发光效率为2.51 cd·A-1.     

掺杂meso-四(对葵酰氧基苯基)卟啉铂的饱和红色聚合物发光器件

在聚2,7-(9,9-二辛基)芴(PFO)和30%的2-(对联苯基)-5-(对叔丁基苯基)-1,3,4-噁二唑(PBD)主体材料中掺杂短磷光寿命的meso-四(对正葵酰氧基苯基)卟啉铂（TDPPPt）,制成聚合物基发光器件。 器件结构为：ITO/PEDOT∶PSS/PVK/PFO+30%PBD∶TDPPPt/Ca/Al（ITO:氧化铟锡;PEDOT:聚3,4-乙撑二氧噻吩;PSS：聚苯乙烯磺酸盐;PVK：聚乙烯基咔唑）。 当客体掺杂浓度≥3%时,器件给出饱和的红色发射。 当驱动电压从7 V升高至14 V时,器件发光色度保持不变,CIE(国际发光照明委员会)色坐标稳定在(0.66,0.28）左右。 器件的最大亮度和电流效率分别为1.390 cd/m2和1.34 cd/A。 在电流密度100×10-3和150×10-3 A/cm2时,电流效率分别为1.18和0.99 cd/A,器件在高电流密度下具有良好的稳定性。     

稀土配合物的光致和电致发光性能的研究

合成了一种新型的稀土配合物Tb(acac)3dad, 讨论了其光致发光的性质 . 以其为发射层制备了结构为ITO/TPD (50 nm)/Tb(acac)3dad (75 nm)/PBD (50 nm)/Al (400 nm) 的电致发光器件, 该器件的启动电压为7 V, 18 V时得到了最大亮度为62 cd·m -2, 发现器件的电致发光光谱与配合物Tb(acac)3dad的光致发光光谱有明显不同.     

聚(对-苯撑乙烯)衍生物蓝色发光二极管及平面显示

成功地合成了柔性脂肪链段和刚性发光链段相互交替的共聚物,并对其进行了表征.发现该聚合物的荧光随柔性链段的增长而增强的实验结果.用所合成的共聚物作发光层,研制出了发光亮度可达190cd/m~2,最小开启电压为15V的发蓝色光的聚合物发光二极管及平板显示屏.讨论了(口恶)二唑衍生物(PBD)和8-羟基喹淋铝(Alq_3)电子输运层的引入对器件的发光亮度和稳定性的影响.     

铽配合物[Tb(m-MBA)3phen]2·2H2O的有机电致发光

将稀土铽配合物[Tb(m MBA)3phen]2·2H2O作为发光材料应用于有机电致发光。把铽配合物掺杂在PVK中经甩膜制得发光层,并分别用AlQ和PBD作为电子传输层制作了两类有机电致发光器件。器件1:ITO PVK:[Tb(m MBA)3phen]2·2H2O PBD LiF Al;器件2:ITO PVK:[Tb(m MBA)3phen]2·2H2O AlQ LiF Al,研究了两种器件的电致发光性能,并通过选择AlQ的厚度得到了发光性能较好的用AlQ作为电子传输材料的器件,其最大亮度在20V时达到140cd·m-2。     

p型结构的高效有机白光器件

制备了一种高效的p型结构的红光有机发光器件.对比发现这种p型结构的器件在亮度、电流密度以及效率等方面都优于普通的器件.将这种p型结构应用到白光器件上,使用红、绿、蓝三种发光材料作为发光层,通过调节它们各自的发射强度来实现白光发射.优化条件后,制得白光器件的最大电流效率和功率效率分别为19.3cd.A-1和12.1lm.W-1,最大亮度可达到31770cd.m-2,在5到11V驱动电压范围内为较纯正的白光,器件的可重复性好.     

抗菌医药左氧氟沙星在有机电致发光二极管中的应用

左氧氟沙星(LOFX)是一种知名的抗菌药物, 它的价格非常便宜, 且有成熟的合成和纯化技术. 本文中首次将LOFX作为一种蓝光发光材料和电子传输材料应用于有机电致发光器件(OLED)中. 通过热重分析、UVVis吸收光谱、发射光谱以及循环伏安曲线详细地表征了LOFX的热学及光物理特性. LOFX有高的分解温度,为327 ℃; HOMO、LUMO能级分别为-6.2 和-3.2 eV, 光学带隙为3.0 eV. 以LOFX作为客体材料, 掺杂在主体材料4,4'-二(9-咔唑)联苯(CBP)中制备了蓝光OLED, 该器件的电致发光(EL)发射峰位于452 nm, 最大亮度为2315 cd·m^-2. 进一步, 选择8-羟基喹啉铝(Alq₃)作为参考材料, 分别以LOFX和Alq₃作为电子传输材料制备了结构相同的单载流子器件和绿色磷光OLED. 在相同的电压下, 以LOFX作为电子传输材料的单载流子器件的电流密度比以Alq₃作为电子传输材料的单载流子器件更高. 同时, 以LOFX作为电子传输材料的绿色磷光OLED获得更高的器件效率. 从这些EL性能可以看出, LOFX同时也是一很好的电子传输材料.     

基于Zn(Q-Ph)2与DCJTB非掺杂型OLED的制备及其电致发光性能研究

合成了有机发光材料2-苯基-8-羟基喹啉锌Zn(Q-Ph)2, 通过1H NMR, UV-Vis及MS等手段对配合物进行了结构表征. 利用该材料与高效的红光染料DCJTB复合制备出全新结构的非掺杂型OLED器件, 其结构为ITO/NPB/DCJTB/Zn(Q-Ph)2/AlQ3/Al. 将DCJTB超薄层的厚度调节到0—2.0 nm范围内, OLED器件的发光色调经历了黄光、红光和橙光的转变, 并且探讨了DCJTB厚度对OLED发光机理以及发光复合区域的影响. 当DCJTB的厚度为0.5 nm时, 获得了稳定的红光发射, 该器件在5.5 V电压下启亮, 在25 V外加电压下发光亮度达到420 cd/m2, 对应的电流密度为250 mA/cm2.     

Organic electroluminescent device based on electropolymerized polybithiophene as the hole-transport layer

An ultrathin film of polybithiophene (PBTh), used in organic electroluminescent (EL) devices, was generated by an electrochemical method with a conducting indium tin oxide (ITO) glass as the working electrode. The light-emitting layer could be deposited directly onto the PBTh by using spin coating for fabrication of the organic EL devices. It was found that the film of PBTh as the hole-transport layer for the EL device could effectively raise the EL intensity and efficiency. The EL intensity of the ITO/PBTh/emitting layer/Al device is about 100 times as strong as that of the ITO/emitting layer/Al device at the same current density of 50 mA/cm².     

Enhancing electroluminescence performance of MEH-PPV based polymer light emitting device via blending with organosoluble polyhedral oligomeric silsesquioxanes

Organosoluble polyhedral oligomeric silsesquioxanes (POSS) blending effect on electroluminescence properties of MEH-PPV based polymer light emitting device was investigated. Excellent compatibility and surface morphology of organosoluble POSS and MEH-PPV based composite films were observed using AFM spectroscopy. The surface roughness of POSS:MEH-PPV composite film increased with increasing POSS content. Interfacial area between the light-emitting layer and cathode was favorably enhanced for cathode electron-injection. MEH-PPV blended with POSS would create a better balance between the electron and hole fluxes for POSS:MEH-PPV composite film based devices. This led to greater current efficiency of the POSS:MEH-PPV composite film based device as compared to one with a light emitting layer of MEH-PPV. Organosoluble POSS concentration effects on the PL spectra and EL performances were also studied for the POSS:MEH-PPV composite film based polymer light emitting devices.     

8－羟基喹啉铝掺杂聚乙烯基咔唑薄膜的光致发光及电致发光

８－羟基喹啉铝掺杂聚乙烯基咔唑薄膜的光致发光及电致发光马於光,唐建国,沈家骢,刘式墉（吉林大学分子光谱与分子结构开放实验室,集成光电子学国家联合重点实验室,长春,１３００２３）关键词聚合物,光致发光,电致发光,８－羟基喹啉铝某些有机染料作为波长转换介...     

有机金属聚合物/多酸纳米杂化LB膜的制备与光电性质研究

以含有共轭大π键的有机金属聚合物(OMP)作有机组分, 以Keggin结构和Dawson结构钨(钼)磷杂多酸作无机组分, 以十八胺为辅助成膜剂, 用LB技术制备了3种新型有机金属聚合物/十八铵/杂多阴离子OMP/ODA/HPA (HPA＝PMo₁₂, PW₁₂, P₂Mo₁₈)杂化LB膜. 用π-A曲线﹑UV-vis吸收光谱﹑荧光光谱﹑原子力显微镜(AFM)﹑扫描隧道显微镜(STM)和表面光电压谱(SPS)对标题LB膜的成膜性能及光电性质进行了研究, 结果表明标题杂化LB膜的崩溃压为26.8 mN/m, 在可见光区有较强的光电压响应, 并有好的发光性质. 当电压为±8.0 V时, 隧道电流是－0.1～－2.3 nA.     

Influence of Poly(methylmethacrylate) on 8-hydroxyquinoline Derivative-Metal Complexes Electroluminescence

A new method is presented of enhancing the organic electroluminescent(EL) efficiency by using poly (methylmethacrylaie) (PMMA) as barrier layers which play the role of controlling the electron-hole recombination in the organic EL materials. The organic EL device with one layer of 8-hydroxyquinoline derivalive-metal complexes-(Alq3, Znq2) as the EL-emitting layers, and two layers of EL emitting materials deposited on PMMA Langmuir-Blodgett films (PMMA/Alq3, PMMA/Znq2) sandwiched between indium/tin oxide (ITO) and aluminum electrodes have been fabricated, respectively. The evidence reveals that the LB film takes an importance to raising the 8-hydroxyquinoline derivative-metal complexes EL efficiency.     

2-(N-十六烷基氨基甲酰基)-8-羟基喹啉镉配合物的电致发光

本文首次报道了采用2-(N-十六烷基氨基甲酰基)-8-羟基喹啉镉配合物作为一种新型发光材料，通过LB膜技术来制备发光层所制得的电致发光器件。在室温下，当直流正向偏压为6.5 V时，可于暗室中用肉眼观察到发光。当电流密度为35 mA/cm²时，可得稳定的发光，其电致发光图谱峰值在490 nm处。     

Electrochemically deposited organic luminescent films: the effects of deposition parameters on morphologies and luminescent efficiency of films

The electropolymerization behaviors of an electroactive and luminescent compound TCPC as precursor are studied. The resultant electrochemical deposition (ED) films are characterized by cyclic voltammetry (CV), UV-vis, fluorescence spectra, scanning electron microscopy (SEM), and atomic force microscopy (AFM). Under the CV mode with potential range of -0.5 to 0.85 V vs Ag/Ag(+), the coupling reactions between the carbazole units of TCPC are very efficient, while the fluorescent trifluorene segment in TCPC is chemically inert in this potential range, which results in a highly fluorescent film formation on indium tin oxide (ITO) electrode. The deposition parameters for preparing the TCPC-based ED films are optimized, and the best ED film gives the fluorescence efficiency of 45.5% with surface roughness of 2.8 nm and morphologic stability as heating to 180 degrees C. The light-emitting devices (LEDs) using this ED film as light emitting layer with structure ITO/ED film (approximately 100 nm)/Ba/Al achieve maximum luminescence and external quantum efficiency of 4224 cd/m(2) at 17 V and 0.72% at 11.5 V, respectively, which are better than the device using TCPC spin-coating films as emitting layer. The technique provides a facile route toward a patternable luminescent film and device because such luminescent ED films can be manipulatively deposited on the electrified electrode.     

嵌入花生酸镉单层中的卟啉-紫精分子聚集行为的研究

本文制备了卟啉-紫精与花生酸镉混合LB膜, 用紫外可见光谱研究了膜中卟啉基团的聚集及取向, X射线衍射说明混合LB膜具有层状有序的周期结构。扫描电镜结果表明: 通过调节膜的表面压可使聚集成"微畴"的卟啉-紫精均匀分布在花生酸镉单分子层中, 随膜表面压的增大, 小的"微畴"相互连接形成更大的"微畴"。电子衍射说明混合膜中两组份分相存在, 且都为六角对称的有序结构。     

Microstructure and Ion Exchange in Stearic Acid Langmuir-Blodgett Films Studied by Fourier Transform Infrared-Attenuated Total Reflection Spectroscopy

Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectra have been recorded of 11-layer Langmuir-Blodgett (LB) films of stearic acid deposited at various surface pressures (0.1, 15, and 35 mN/m), and the molecular orientation angles were evaluated quantitatively, which supplied insight into the molecular order with the alkyl chains tightly packed like crystal in the LB films deposited at the zero and higher surface pressures. These experimental results indicate that, in the Langmuir film as the precursor of LB films, stearic acid molecules self-aggregate to form two-dimensional crystalline domains already even at the zero surface pressure, which results in the inhomogeneity of monolayer. The analysis of dependence of nu(C=O) intensity on the surface pressure, surface density, and subphase temperature leads to the conclusion that the defects in LB films originate from the Langmuir film and be conserved upon deposition. Annealing below 50 degrees C and cooling could improve the monolayer homogeneity, and thus a defect-free or low-defect LB films can be deposited. Furthermore, ion exchange conducted in the LB films, on the other hand, confirms the existence of structure defects in LB films of stearic acid. The polar plane microstructure, lateral transport along the polar planes and the coordination types of stearic acid/cation system may be the rate-limiting process. The results have implication on the possible uses of stearic acid LB films as ion-exchange materials or sensors. Copyright 2001 Academic Press.     

多孔硅表面钝化对其发光性能的影响

报道多孔硅（PS）的表面钝化对其光致发光（PL）和电致发光（EL）的影响。PL和EL谱表明,经钝化处理的PS的PL和EL强度明显增强,且发光峰位较大蓝移;存放实验表明,经钝化处理的PS的PL和EL发光强度和发光峰位具有较好的稳定性;I～V曲线显示,经钝化处理的PS发光器件具有较低的启动电压。这些结果表明：用钝化处理的方法是提高PS的PL和EL强度和稳定性及改善其器件性能的有效途径。