聚萘乙炔的光致发光与电致发光

用可溶性前聚物法制备的聚１,４－萘乙炔制成单层有机电致发光器件。该器件阳极为ＩＴＯ,阴极为Ｃａ,器件在正向偏压４Ｖ左右时开始发光,发光谱峰值为６０５ｎｍ,最高亮主为１４０Ｃｄ／ｍ＾２。文章分析了ＰＮＶ发光器件的发光机理,并给出了器件的能带模型。     

PPV／ZnS薄膜器件发光及电导的研究

以Ⅱ－Ⅵ族无机半导体ＺｎＳ替代双层有机薄膜电致发光器件的电子传输层,以ＰＰＶ为空穴传输层和发光层制备发光器件,得到发光亮度和效率都比单层ＰＰＶ器件高的电致发光器件。器件结构为ＩＴＯ／ＰＰＶ／ＺｎＳ／Ａｌ。器件的电致发光光谱同单层ＰＰＶ器件的光说基本相同,但启亮电压只有４．５Ｖ,亮度也比单层器件高一个量级。通过ＰＰＶ层自吸收现象可塑料出发光区域在ＰＰＶ／ＺｎＳ界面处。器件的电流密度与电压的二次方式线     

两种聚噻吩类新型电致发光材料的合成与性能

报道了以无水FeCl3为催化剂合成异戊基取代和戊氧基取代聚噻吩的实验过程,两种聚合物稀溶液和薄膜的光发射、光吸收性能和用这两种材料作发光层制作的发光二极管的光电性能的初步研究结果.两种聚合物均具有较高的纯度和分子量.两种材料均显示了较好的发光性能,其电致发光颜色均为红橙色.烷氧基取代聚噻吩均聚物电致发光性能在学术界尚属首次发现.     

烷氧基取代聚对苯乙炔单层电致发光器件

以对甲氧基苯酚为起始原料,用脱氯化氢法得到可溶性的聚（２－甲氧基－５－壬氧基）对苯乙炔（ＰＭＯＮＯＰＶ）,以ＰＭＯＮＯＰＶ为发光层装配了相对稳定的单层电致发光器件,其起亮电压为５伏。研究了ＰＭＯＮＯＰＶ的电致发光（ＥＬ）和光致发光（ＰＬ）性质。     

高效单发光层绿色有机发光二极管的制备与性能研究

为了提升绿色有机发光二极管的效率,设计了阶梯能级结构的器件,使得载流子在器件中更有效传输,进而有效减缓了器件效率的衰减。选择热致延迟荧光材料(4s,6s)-2,4,5,6-四(9-氢咔唑-9-基)间苯二腈(4CzIPN)作为发光材料,并将其掺杂到能级匹配的主体材料1,3-二(咔唑-9-基)苯(mCP)中构成发光层,制备了一系列单发光层的绿色有机发光二极管。在发光材料的掺杂浓度为2%(wt,质量分数),发光层的厚度为20nm条件下,制得的器件性能最佳,其启亮电压为3.4V,其最大亮度、电流效率、功率效率和外量子效率分别为20706cd/m~2、50.49cd/A、41.96lm/W和16.7%。在亮度为1000cd/m~2条件下,其电流效率和外量子效率仍然高达34.06cd/A和11.6%。器件显示主峰位于504nm的4CzIPN特征发射,随着掺杂浓度的提升,越来越多的电子和空穴被4CzIPN分子所俘获,导致主体材料mCP的特征发射峰逐渐减弱。     

具有双掺杂发射层白光OLED器件结构的研究

白光有机电致发光器件是获得全色器件的基础。制备了一种具有双掺杂发射层的白光OLED器件，其结构为ITO／CuPc／NPB／ADN：TBP以ALQ：DCJTB／ALQ，Mg：Ag，将2，5，8，11-tetra-tertbutylperylen-e（TBPe）掺杂到蓝光主体材料ADN中作为蓝色发光层，4-（dicyanome-thylene）-2-t-butyl-6-（1，1,7，7tetramethyljul-olidyl-9-enyl）-4H-pyran（DCJTB）掺杂到AIQ中作为红色发光层，通过实验结果对比，研究了TBPe以及DCJTB的掺杂浓度对器件性能的影响，确定了当TBPe浓度为3％（质量分数），DCJTB浓度为1．8％（质量分数），时，获得的白光器件性能最优。     

分层优化薄膜电致发光器件预热层的研究

在本文的工作中，我们比较了以ＳｉＯ２／Ｙ２Ｏ３和ＳｉＯ２／Ｔａ２Ｏ５为复合预热层及以ＳｉＯ为预热层的电致发光器件的发光亮度和传导电流，我们发现ＳｉＯ作为预热层的器件发光亮度优于其它两种器件。利用数值模拟的方法，推导出热电子能量，结果表明，ＳｉＯ为预热层的电致发光器件的热电子能量也明显高于另外两种器件。     

单发光层结构的白色有机电致发光器件的研究

在研究了合成并提纯的蓝光材料Liq和黄光染料Rubrene发光特性的基础上,采用高效的荧光染料Rubrene作为掺杂剂掺杂在母体材料Liq中,制备了单发光层结构的有机电致发光器件.当掺杂摩尔分数为1.0%时,器件得到了近白色发光(色度x=0.29,y=0.34),在驱动电压为24V 时,器件的亮度达到了2804cd/m2,在驱动电压为16V时,器件的效率达到了4.6cd/A.     

TMEP作为缓冲层增加有机发光器件的效率的研究

在有机发光器件中的发光层和阴极之间插入了稳定性好、有良好电子传输能力的苝酸四甲酯(TMEP)新型缓冲层,改善了有机电致发光器件的亮度和发光效率.在电流密度为200mA/cm2时,有缓冲层的器件B效率为0.82cd/A,没有缓冲层的器件A效率为0.14cd/A.     

9,9′-联蒽的合成及其白色有机电致发光器件的研制

详细叙述了利用9-溴蒽为原料制备高纯蓝色有机发光材料9,9′-联二蒽的方法,在研究了此材料和黄光染料Rubrene发光特性的基础上,采用高效的荧光染料Rubrene作为掺杂剂掺杂在母体材料9,9′-联蒽中,制备了单发光层结构的有机电致发光器件。当掺杂摩尔分数为1.0%,驱动电压为12V时,器件得到了近白色发光(色坐标x=0.328,y=0.342)。在驱动电压为23V时,器件的亮度达到了7843cd/m2,在驱动电压为13V时,器件的效率达到了3.45cd/A。     

A new precursor to electroconducting conjugated polymers: synthesis and opto-electrical properties of luminescent devices based on these PPV derivatives

A variety of novel conjugated PPV-related polymers have been synthesised using a synthetic approach that allows the tailoring of the chemical structure of the polymer backbone. In this way we have been able to prepare not only poly(p-phenylene vinylene) (PPV) (1), but also some electron-rich PPV derivatives such as poly(2,5-dimethyl-1,4-phenylene vinylene) (PDMetPV) (2) and poly(2,5-dimethoxy-1,4-phenylene vinylene) (PDMeoPV) (3) and PPV derivatives with an enlarged aromatic system, poly(4,4′-bisphenylene vinylene) (PBPV) (4) and poly(2,6-naphtaln vinylene) (PNV) (5). These materials were characterised in terms of molecular weight (GPC), elimination temperature (TGA, FT-IR), optical properties (UV-VIS), photoluminescence (PL) and device characteristics of the LEDs.     

Bulk heterojunction organic solar cell based on a novel fluorescent fluorine–boron complex

The photovoltaic properties of solar cells were investigated via spin coating the poly (2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and a newly synthesized n-type difluoro [2-(2-pyridinyl)-1H-indene-1,3(2H)-dionato-N2, O1]-(T-4)-boron (PIDB) with lower LUMO level as active layers. The active layers were characterized in solid state by means of absorption and photoluminescence (PL) spectra with three mixtures ratios in weight. Compared to the pure MEH-PPV, the results showed the blend of MEH-PPV and PIDB enhanced the light intensity as well as broadened the wavelength range of absorption; the intensities of PL spectra of the blends are quenched and confirmed the electron transferred from the photoexcited MEH-PPV backbone to PIDB. Much higher power conversation efficiency was achieved when their mixtures were with a ration of 1:1 by weight. The improved performance of device is attributed to the reduction of contact resistance, which derived from the impedance analysis.     

聚(2,5-二丁氧基)对苯乙炔的合成、表征及发光性能研究

用强碱诱导的脱氯化氢法合成了发光聚合物聚（2，5－二丁氧基）对苯乙炔（PDBOPV），并与前聚物路线合成法进行了比较。脱氯化氢法具有反应时间短和产率高等优点，而且不需要进行高温处理，有利于相关器件的制备。用紫外、红外光谱和^1H-NMR对聚（2，5－二丁氧基）对苯乙进行了表征，测定了荧光（PL）光谱，讨论了烷氧基取代对聚合物光学性质和可溶性的影响。     

Blue emitting diodes based on self-assembled multilayers of cationic oligo(p-phenylene vinylene) and sulfonated polyaniline

Boladication form oligo(p-phenylene vinylene) (OPV) was synthesized and mixed boladication–polyanion multilayer thin films have been self-assembled by a process based on electrostatic interaction. Electroluminescent spectral fine structures of these self-assembled thin films showed differences in vibronic coupling intensity and space. The poly(aniline-co-N-propane-sulfonic acid aniline) (PAPSAH) provided better charge transport ability than poly(sulfonated styrene) (PSS) and the turn-on voltage of the device based on boladication OPV/PAPSAH multilayer thin films is lower than that of the PSS counterpart.     

Tin oxide as a transparent electrode material for light-emitting diodes fabricated with poly (p-phenylene vinylene)

We have fabricated light emitting diodes (LED) with poly (p-phenylene vinylene) (PPV) as the emissive layer and tin oxide (TO) as the transparent conducting positive electrode and aluminium as the negative electrode. The fabrication conditions are optimized for visible light emission in these TO/PPV/Al LEDs. The threshold voltage for substantial charge injection for visible light emission in these LEDs lies below 10V. The device fabrication and electrical characterization of TO/PPV/Al LEDs are discussed in this communication.     

Preparation of single conjugated polymer nanofibers with high opto-electric response

Single pristine poly(p-phenylene vinylene) (PPV) nanofibers were prepared by electrospinning. The fibers were characterized by fluorescence microscopy, scanning electron microscopy, and polarized fluorescence spectra. The results indicated that the fibers were stretched and oriented toward to rollup direction during the electrospinning process and PPV polymer molecules were oriented with their conjugated backbones along the PPV fiber direction. The parallel array of countable PPV nanofibers was assembled into a photoconductor device. The device shows much higher sensitivity to photo detection than device with PPV film, indicating efficient carrier transport in the well-oriented polymer fibers. This facile, easily operated method for the fabrication of well-oriented fibers indicates its potential application in optoelectronic devices.     

Synthesis of novel coumarin-terminated poly (<Emphasis Type="Italic">p</Emphasis>-phenylene vinylene)s for application in LEDs

Novel coumarin-terminated poly (p-phenylene vinylene)s were synthesized successfully via Gilch methodology. The resulting coumarin end-capped poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene (CT-MEH-PPV) film gives yellow photoluminesence with a maximum intensity at 560 nm, which is noticeably blue-shifted about 40 nm from that of MEH-PPV (598 nm). Light-emitting diode based on a double-layer structure (ITO/PEDOT/CT-MEH-PPV/Ba/Al) showed yellow emission with a maximum brightness of 956 cd m^{– 2} at 8.8 V and an external quantum efficiency of 0.28% at 49.5 mA cm^{– 2}. The coumarin-terminted poly(2,3-diphenyl-5-hexyl -1,4-phenylene vinylene (CT-DPH-PPV), however, has similar emission spectrum with that of DPH-PPV, but its photoluminescence efficiency (0.78) is much more improved than that of DPH-PPV (0.55). The electroluminescent device (ITO/PEDOT/CT-DPH-PPV/Ba/Al) gave green emission peaked at 510 nm with a maximum brightness of 350 cd m^{– 2} at 18 V and an external quantum efficiency of 0.04% at 61 mA cm^{– 2}. These results suggest that it is a convenient way to modify the structure of conjugated polymers by terminating to tune the emission color and improve photoluminescent and electroluminescent efficiencies as well.     

Influence of oxygen deficiency in indium tin oxide on the performance of polymer light-emitting diodes

We investigated effects of oxygen deficiency in the indium tin oxide (ITO) on the performance of poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV)-based polymer light-emitting diodes, in which the ITO anode was deposited by radio frequency magnetron sputtering at different oxygen flow rates. We found that the degree of oxygen deficiency in the ITO films can affect the device performance significantly and is a source of current leakage. At the optimal oxygen flow rate, the leakage current of devices can be reduced and the balance between hole and electron fluxes can be promoted in the MEH-PPV layer to improve device efficiency.     

合成方法对导电高分子聚取代PPV性能的影响

采用４种不同方法合成了导电高分子聚（２，５－二甲氧基对苯乙炔）（ＰＰＶ），并对性能进行了研究。实验结果表明，不同合成方法影响前聚物的产率、分子量及其分布、以及微观结构。由４种方法所得导电聚合物的结构也有差别，由此影响产物的光致发光效率、导电率。并对合成方法的适用性进行了比较，筛选出适宜的方法以制备高质量的聚（２，５－二甲氧基对苯乙炔）。