用于有机电致发光材料的萘酰亚胺类荧光染料的研究进展

综述了萘酰亚胺类荧光染料及其在电子传输、空穴传输、发光材料等方面应用的研究进展。有24篇参考文献。     

高功函数金属Al作阴极的高效率白光聚合物电致发光

我们用聚电解质PFN做电子注入层,制备了高功函数金属Al做阴极的高效率白光聚合物电致发光。以蓝绿光发光中心的聚合物为主体和掺杂红光磷光染料,通过改变红磷光的掺杂浓度调节器件的电致发光光谱,得到白光发射。并研究了电子传输材料对WILLED器件发光光谱的影响。     

红光区双效发光材料BODIPY的制备及其光谱性质

通过吲哚衍生物与1,8-萘内酰亚胺缩合及氟硼化反应，得到meso位无取代和甲基取代的两种配体（Ⅰ、Ⅲ）及两种氟硼二吡咯（BODIPY）染料（Ⅱ、Ⅳ）。其结构和光学性能经NMR、HRMS、单晶、UV-Vis吸收光谱、荧光发射光谱和固体荧光光谱进行了表征。结果表明，meso位引入甲基后配体Ⅲ较配体Ⅰ的固体荧光发射峰红移了34 nm。BODIPY染料具有较强的双效荧光（溶液和固体荧光），其中BODIPY染料Ⅳ的溶液和固体荧光量子产率分别高达65.8%和76.3%，其固体荧光量子产率较meso位无取代BODIPY染料Ⅱ（14.6%）提高了4.2倍。BODIPY染料Ⅳ较强的双效发光可归因于其固体堆积方式中无C—H…π作用以及层与层之间存在的“头-尾”π-π堆积。不同于其他提高固态荧光的策略，在母体meso位引入小位阻甲基的策略使BODIPY具有双效红光发射性能，也丰富了双效有机发光材料的种类。     

分子型有机空穴传输材料和红色发光材料的设计合成、物化性质及在有机电致发光器件中的应用

有机电致发光器件具有直流电压驱动、主动发光、体积小、无视角限制、响应快 ,以及色彩全、制作工艺简单等优点 ,作为新型显示技术而倍受瞩目 .在构建有机电致发光器件的三大材料中 (空穴传输材料、电子传输材料和发光材料 ) ,空穴传输材料的玻璃化温度(Tg)以及红色发光材料的色纯度和发光效率亟待改进 .本论文通过对分子进行合适的裁剪与修饰 ,设计合成了具有良好应用前景的空穴传输材料和红色发光材料 ,研究了化合物的物化性质与分子结构的关系以及它们在器件上的应用 .1　吡唑啉化合物1,3,5 三芳基 4 ,5 二氢 1H吡唑 (2 吡唑啉 )化合…     

层状蛭石有机荧光染料组装超薄膜

基于有机荧光染料的固体团聚或者堆叠导致荧光猝灭、发光和稳定性减弱，采用剥离与超分子组装的方法，制备固体荧光超薄膜发光体。首先通过剪切剥离制备蛭石纳米片，控制其粒径分布在30~300 nm，再通过与有机荧光染料（罗丹明6G和罗丹明B）层层超分子组装的方法，获得蛭石有机无机荧光薄膜。经对比实验发现，不添加蛭石纳米片，无法获得均匀发光的荧光薄膜。蛭石有机无机荧光薄膜的SEM显示，有机荧光染料和蛭石分布均匀，克服有机荧光染料团聚或者堆叠的荧光猝灭，实现荧光亮度可控。     

微波合成西佛碱络合物的电致发光性能

利用微波固相反应,合成了水杨醛-己二胺-锌Schiff碱络合物,通过时络舍物进行热分析,发现由己二胺合成的金属络合物具有较高的热稳定性,可用作电致发光材料。不加空穴转移层的器件发光亮度较低,而加入二胺作为空穴转移层材料器件的亮度可达1 390 cd/m2。     

含腈基的三苯胺基二苯乙烯化合物的合成及其电致发光性能研究

本文成功地合成了集空穴传输基因三苯胺和电子受体基团腈基于一个分子中的腈基取代的三苯胺基二苯乙烯系列化合物,获得电子和空穴都能够高效注入和传输的新型电致发光材料,由于这种材料制备的电致发光器件的性能稳定,启动电压显著降低,发光为黄绿色。     

有机电致发光器件中几种常用组分的荧光光谱研究

利用荧光光谱对电致发光器件(OLED)中几种常用化学组分的荧光猝灭和光诱导电子转移问题进行了研究．发现两种常用的空穴传输材料NPB和TPD与常用电子传输材料AlQ3在光的帮助下可发生电子转移、根据荧光猝灭的Stern—Volmer作图和用单光子记数法测得的荧光寿命而计算得到的猝灭速度常数和扩散速度常数相对应，明确地表明这里的猝灭具有电子转移特征、并对所得的结果进行了讨论。     

咔唑及其衍生物在蓝光OLED中的运用

近年来,人们对咔唑的研究十分关注,其在医药、染料和农药等中的应用也越来越广泛,而咔唑及其的衍生物具有特有电学、电化学和光物理等性能,其不仅能够当作良好空穴传输的材料,且在咔唑的化合物内不同的位置进行电子传输的修饰基团引入,能够使电子与空穴更易注入,对两者平衡进行有效调节,因此其也被当作用于蓝光荧光的重要材料,下面,本文就针对咔唑及其衍生物在蓝光OLED中的运用进行分析,来对其进行深入的了解。     

用于有机电致发光材料的萘酰亚胺类化合物的研究进展

介绍了用于有机电致发光材料的萘酰亚胺类化合物分子结构特点与荧光的关系,综述了其在电子传输、空穴传输、发光材料及其他方面的应用的研究进展,并对其未来的发展做了展望。     

具有不同取代基的吡唑啉衍生物的光致发光和电致发光

在合成两种具有不同取代基的吡唑啉衍生物ＰＤ１和ＰＤ２的基础上,研究了不同取代基效应对其光致发光和电致发光性质的影响。结果表明甲氧基取代的化合物ＰＤ２较Ｎ,Ｎ－二甲氨基取代的化合物ＰＤ１具有更高的荥光量子产率。而在作为有机电致发光器件的掺杂染料,光其器件结构为ＩＴＯ／ＴＰＤ／ＴＰＢＩ：２％ＰＤ／ＴＰ－ＢＩ／Ｍｇ：Ａｇ时,ＰＤ１掺杂染料却有着较ＰＤ２更高的电致发光效率。光器件的电流密度为４２０ｍＡ／ｃ     

Novel white-light-emitting polyfluorenes with benzothiadiazole and Ir complex on the backbone

Novel white-emitting polyfluorenes were synthesized by mixing fluorescence and phosphorescence emission. Benzothiadiazole(BT) and iridium(III)bis(2-(1-naphthalene)pyridine-C^2′,N)-2,2,6,6-tetramethyl-3,5-heptanedione[(1-npy)₂Ir(tmd)] units were incorporated into polyfluorene backbone as green and red chromophores by Suzuki polycondensation. The device from PFG03-IrR07 shows a maximum luminous efficiency (LE) of 5.3 cd/A, a maximum luminance of 9900 cd/m² at a current density of 453 mA/cm² and a CIE coordinate of (0.32, 0.34) with the configuration: ITO/PEDOT:PSS/PVK/emissive layer/CsF/Al. Besides, the EL efficiencies decline slightly with increasing the current density. All emissions located very close to the equi-energy white point (0.33, 0.33) when applied voltage change from 9 to 14 V. Furthermore, the white emission of devices based on these materials shows very good color quality, with high color rendering index range between 84 and 89. Our results indicate that, by incorporation of singlet and triplet species into polymer backbone, the obtained white-emitting materials and devices are promising candidates for display and solid-state-lighting purpose.     

Hole-limiting conductive vinyl copolymers for AlQ3-based OLED applications

A series of soluble conductive vinyl copolymers containing a hole-transporting N-(4-methoxyphenyl)-N-phenylnaphthalen-1-amine (MeONPA) moiety and an electron-transporting/hole-blocking 2,5-diphenyl-1,3,4-oxadiazole (OXA) moiety at different composition ratios were synthesized and characterized. The copolymers were applied as the hole-transporting layer (HTL) for a series of heterojunction Organic Light-emitting Diodes (OLEDs) employing the commonly used green emitter tris(8-hydroxyquinolinato)aluminum (AlQ₃) as the electron-transporting layer. AlQ₃ is known to have inferior electron mobility compared to most typical hole-transporting materials. As a result, oxidative degradation of the AlQ₃ emitters caused by the excessive holes accumulated at the interface led to deterioration of the device over time. From the measurement of hole current only devices using electron blocking gold as cathode (ITO/PEDOT:PSS/copolymer/Au), it was found that the hole current for the copolymers reduced as the OXA composition increased. Optimum performance for the AlQ₃-based OLED (ITO/PEDOT:PSS/copolymer/AlQ₃/Ca/Al) was achieved for a 82/18 (molar ratio) (MeONPA/OXA) copolymer. The maximum current efficiency and luminance were 4.2 cd/A and ca 24,000 cd/m² respectively for the charge-balanced copolymer compared to 3.5 cd/A and 6600 cd/m² for similar device employing a homopolymer P(MeONPA) as the HTL.     

Carbazole/fluorene copolymers with dimesitylboron pendants for blue light-emitting diodes

A series of random and alternating carbazole/fluorene copolymers with various dimesitylboron-containing carbazole derivative contents were synthesized by Suzuki polymerization for use as a light-emitting layer in blue light-emitting diodes. Two carbazole derivatives, CzPhB and CzPhThB consisted of a carbazoyl group as the donor and a dimesitylboron group as the acceptor group, separated by phenyl and phenyl-thiophene groups π-conjugated systems, respectively. The copolymers exhibited good thermal stability and blue emission in both solution and the solid state. Moreover, the CzPhB/fluorene and CzPhThB/fluorene copolymers exhibited a higher PL quantum efficiency than the fluorene-based homopolymer (POF). Higher brightness and larger current efficiency were observed for the CzPhB/fluorene and CzPhThB/fluorene copolymer-based devices compared to the POF-based device. Additionally, the CzPhThB/fluorene copolymer-based devices had better EL performances than the CzPhB/fluorene copolymer-based devices. The turn-on voltage, maximal brightness, and highest luminescence efficiency of the carbazole/fluorene copolymer-based devices were found to be 4.5-8.5 V, 436 cd/m², and 0.51 cd/A, respectively.     

Enhancing the electroluminescence properties of novel blue light emitting polymer and MEH‐PPV based white light emitting polymer devices by processing condition optimization

A series of triarylaminooxadiazole‐containing tetraphenylsilane light emitting polymer (PTOA) and poly(2‐methoxy, 5‐(2′‐ethyl‐hexyloxy)‐p‐phenylene‐vinylene) (MEH‐PPV) based white light emitting polymer devices (PLEDs) were fabricated to study blue and orange–red emitter composition and light emitting layer processing effects on white emission electroluminescence properties. Color purity, current turn‐on voltage, brightness, and current efficiency were strongly determined by MEH‐PPV content and the thin film processing condition. The intensity of PTOA blue emission was equal to that of MEH‐PPV orange–red emission when the device was fabricated by a polymer composite film containing 10 wt % of MEH‐PPV. Color purity [Commission Internationale de L'Eclairage (CIE_x,y) coordinates (0.26,0.33)] was nearly white emission under applied 8 V. The brightness and current efficiency of PTOA‐MEH‐PPV composite film based devices increased as MEH‐PPV content increased. Furthermore, white emission blue shifted with increasing spin‐rate of thin film coating and applied voltage. Low turn‐on voltage, high current density, and high brightness were obtained for the device fabricating with light emitting layer coating with high spin‐rate. Moreover, low current efficiency was obtained for the PLED with a thinner light‐emitting layer. A white emission CIE (0.28,0.34) was obtained for PTOA‐MEH‐PPV based white PLED. White PLED brightness and efficiency can be as high as 700 cd/m² and 0.78 cd/A, respectively. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Enhancing the electroluminescence performances of blue polymer light emitting devices via carriers transporting materials incorporation

A series of polymer light emitting devices (PLEDs) based on the composite films of N‐arylbenzimidazoles trimer (TPBI), poly (n‐vinylcarbazole) (PVK), and a triarylaminooxadiazole‐containing tetraphenylsilane light emitting polymer (PTOA) were investigated. Electroluminescence (EL) performance is enhanced with doped TPBI into the light‐emitting layer for the PTOA‐based devices. A deep blue emission (Commission Internationale de L'Eclairage (CIE_x,y) corodinates (0.16,0.06)) is obtained for the TPBI‐PTOA‐based device. Brightness and current efficiency of the TPBI‐PTOA‐based device can be as high as 961 cd/m² and 1.85 cd/A, respectively. The EL performances of TPBI‐PTOA composite film‐based devices are further enhanced by inserting a TPBI layer into the light emitting layer and cathode interface for a better electron and hole charge balance. Doping TPBI into the light‐emitting layer of PVK‐PTOA is not favorable for enhanced EL performances. Brightness and current efficiency reduced with increasing TPBI content for the TPBI‐PVK‐PTOA‐based devices. Similar results are obtained for devices based on the TPBI‐PVK‐PTOA/TPBI bi‐layer composite solid film. Morphology and charge balance effects on EL performances of TPBI‐PTOA and TPBI‐PVK‐PTOA composite films based PLEDs are discussed in detail. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Properties of polymer light‐emitting diodes coated on surface‐treated ITO/glass substrates

We fabricated blue polymer light‐emitting diodes (PLEDs) with indium tin oxide (ITO)/PEDOT : PSS/PVK/PFO‐poss/LiF/Al structures. All of the organic film layers were prepared by the spin‐coating method on plasma and heat‐treated ITO/glass substrates. The dependences of the optical and electrical properties of the PLEDs on the plasma and heat treatment of the ITO film and the introduction of poly(N‐vinylcarbazole) (PVK) layer were investigated. The AFM measurements indicated that the surface roughness of the ITO transparent film was improved by the plasma and heat treatment. In the emission spectra, the intensity of the excimer peaks of the PFO‐poss [polyhedral oligomeric silsesquioxane‐terminated poly(9,9‐dioctylfluorene)] emission layer were decreased for the PLED device with the PVK film layer compared with the one without the PVK layer. The maximum current density, luminance and current efficiency of the PLEDs were found to be about 470 mA/cm², 486 cd/m² at an input voltage of 12 V and 0.55 cd/A at 100 cd/m² in luminance, respectively. The color coordinates (CIE chart) of the blue PLEDs were in the range of x = 0.17 ～ 0.20, y = 0.13 ～ 0.16, and the peak emission spectrum was about 430 nm, showing a good blue color. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Blue organic light-emitting diodes using novel spiro[fluorene-benzofluorene]-type host materials

Deep blue colored, fluorescent, spiro-type host materials, 5-[4-(1-naphthyl)phenyl]-spiro[fluorene-7,9′-benzofluorene] and 5,9-bis[4-(1-naphthyl)phenyl]-spiro[fluorene-7,9′-benzofluorene] were designed and successfully prepared by the Suzuki reaction. The electroluminescence characteristics of the two compounds as blue host materials doped with blue dopant materials, diphenyl[4-(2-[1,1;4,1]terphenyl-4-yl-vinyl)phenyl]amine and 1,6-bis[(p-trimethylsilylphenyl)amino]pyrene (SPP) were evaluated. The device used comprised ITO/N,N′-bis-[4-(di-m-tolylamino)phenyl]-N,N′-diphenylbiphenyl-4,4′-diamine)/bis[N-(1-naphthyl)-N-phenyl]benzidine/Host:5% dopant/tris(8-hydroxyquinolinato)aluminium/Al–LiF. The device obtained from 5-[4-(1-naphthyl)phenyl]-spiro[fluorene-7,9′-benzofluorene] doped with 1,6-bis[(p-trimethylsilylphenyl)amino]pyrene displayed high color purity (0.138, 0.138) and high efficiency (3.70 cd/A at 7 V).     

Electroluminescence performance of a series of fluorene/2,5-di(2-thienyl)-1H-pyrrole polymers

In this article, a series of fluorene/2,5-dithenyl-1H-pyrrole-based electroactive polymers (HS-X) with different feed ratio of SC12F/OF were synthesized via Suzuki coupling reactions. Chemical characterization of polymers was elucidated by ¹H NMR and Fourier-transform infrared spectroscopy. Electrochemical and electrophysical characterization of the synthesized polymers were investigated by cyclic voltammetry, UV-vis spectroscopy, and fluorescence spectroscopy. Thermal stability of polymers were studied with differential scanning calorimetry and manipulation of the Tg values of HS-X polymers was managed by increasing the numbers of the spiroalkylated fluorene (SAF) moieties incorporated into the polymer backbone. Five different conjugated polymers (HS-1, HS-2, HS-3, HS-4, and HS-5) were used as hole transport layer material in the fabrication of organic light-emitting diode (OLED) devices. The energy levels of the highest occupied molecular orbital as well as the lowest unoccupied molecular orbital and photoluminescence intensities were independent of the number of SAF units. OLED devices based on HS-X polymers were fabricated according to ITO/PEDOT:PSS/HS-X/Alq3/LiF:Al device configuration. Their electroluminescence performances were investigated and the best performance were obtained with the polymer containing 20% SC12F (HS-4) in an OLED device with a turn on voltage of 11.8 V, a maximum luminance of 1202 cd/m² and a maximum luminous efficiency of 0.30 cd/A compared to other polymers with different feed ratio.     

Electroluminescent Characteristics of DBPPV–ZnO Nanocomposite Polymer Light Emitting Devices

We have demonstrated that fabrication and characterization of nanocomposite polymer light emitting devices with metal Zinc Oxide (ZnO) nanoparticles and 2,3-dibutoxy-1,4-poly(phenylenevinylene) (DBPPV). The current and luminance characteristics of devices with ZnO nanoparticles are much better than those of device with pure DBPPV. Optimized maximum luminance efficiencies of DBPPV–ZnO (3:1 wt%) before annealing (1.78 cd/A) and after annealing (2.45 cd/A) having a brightness 643 and 776 cd/m² at a current density of 36.16 and 31.67 mA/cm² are observed, respectively. Current density–voltage and brightness–voltage characteristics indicate that addition of ZnO nanoparticles can facilitate electrical injection and charge transport. The thermal annealing is thought to result in the formation of an interfacial layer between emissive polymer film and cathode.