Highly efficient and solution-processed iridium complex for single-layer yellow electrophosphorescent diodes

A novel electrophosphorescent material based on a biscyclometalated iridium(m) complex of the N,N-dipheny1-4 ''-(1-phenyl-1H-benzo[d]imidazol-2-yl)[1,1':4',1 ''-terphenyl]-4-amine ligand, named Ir(TPABPBI)(2)(acac), has been synthesized and its application in organic light emitting devices (OLEDs) was studied. Highly efficient, solution-processed, single-layer, electrophosphorescent diodes utilizing the complex have been prepared and characterized. In these devices, the high triplet energy poly(9-vinylcarbazole) (PVK) is used as a host polymer doped with 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) employed for electron transport. When the doping concentration of Ir(TPABPBI)(2)(acac) is up to 4%, devices with a current efficiency of 30.0 cd A(-1) corresponding to an EQE of 15% can thus be achieved, along with the Commission de l'Eclairage 1931 chromaticity coordinates of (0.507, 0.486). More importantly, the yellow phosphorescence can be achieved without the generation of excimer emission. Such devices exhibit a very broad and featureless peak at ca. 568 nm with a wide full spectral width at half maximum (FWHM) of 83 nm. These results render Ir(TPABPBI)(2)(acac) a promising organic phosphor for applications in yellow OLEDs, especially for large-area, highly efficient and cheap yellow PhOLEDs

Significant Enhancement of Polymer Solar Cell Performance via Side-Chain Engineering and Simple Solvent Treatment

Rational design and synthesis of polymeric semiconductors is critical to the development of polymer solar cells (PSCs). In this work, a new series of benzodithiophene？ difuranylbenzooxadiazole-based donor？acceptor co-polymersnamely, PBDT-DFBO, PBDTT-DFBO, and PBDTF-DFBO, with various side groupshave been developed for bulk-heterojunction PSCs. These side-group substituents provide the opportunity to tailor the opto-electrical properties of the polymers. In addition, we show that the reduction of the bandgap of polymers and the enhancement of charge mobility in the devices can be accomplished concurrently by substituting the alkylthienyl side group with its furan counterpart. In the preliminary investigation, one could obtain PSCs with a power conversion efficiency (PCE) of 2.1% for PBDT-DFBO with an alkoxyl side chain, 2.2% for PBDTT-DFBO with an alkylthienyl side group, and 3.0% for PBDTF-DFBO with an alkylfuranyl side group. Further optimizing the performance of the devices was conducted via a simple solvent treatment. The PSCs based on PBDTF-DFBO:PC71BM could even achieve 7.0% PCE, which exhibited an enhancement of 130%. To the best of our knowledge, the value of 7.0% is the highest efficiency for furan-containing PSCs to date and is also comparable with the hitherto reported highest efficiency of the single junction PSCs. Through a combination of testing charge transport by the space-charge limited current (SCLC) model and examining the morphology by atomic force microscopy (AFM), we found that the effects of solvent treatment on the improved performance originate from higher and more balanced charge transport and the formation of fiberlike interpenetrating morphologies, which are beneficial to the increase of short-circuit current density (Jsc) and fill factor (FF). This work demonstrates a good example for tuning absorption range, energy level, charge transport, and photovoltaic properties of the polymers by side-chain engineering and the solvent treatment can offer a simple and effective method to improve the efficiency of PSCs

一种聚噻吩微球及其制备方法

本发明公开了一种聚噻吩微球及其制备方法。本发明提供了一种通过化学氧化聚合法一步制备导电聚合物聚噻吩微球的方法，包括步骤：(a)提供一含有噻吩单体和无机前体的分散体系；(b)在氧化剂存在下，使所述分散体系中的噻吩单体聚合成聚噻吩，并形成聚噻吩微球；和(c)从所述分散体系中分离出聚噻吩微球。通过调控反应分散体系中的溶剂、噻吩单体、氧化剂及其比例，可以实现不同形貌尺寸聚噻吩微球的可控合成。本发明制备方法简单，工艺绿色环保，成本低廉，所制备的聚噻吩微球尺寸均一

一种高光转化率的含氟聚噻吩光电材料及其制备方法

本发明公开了一种高光转化率的含氟聚噻吩光电材料及其制备方法。本发明高光转化率的含氟聚噻吩光电材料具有含氟聚噻吩受体-聚噻吩-聚噻吩给体的三嵌段高分子结构，其中含氟聚噻吩受体是含氟烷基链的聚噻吩。与现有技术相比，本发明含氟聚噻吩光电材料在聚噻吩结构中引入了强吸电子的含氟基团，提高了电子接受能力；利用可控分步催化剂转移聚合法，合成结构规整的含氟聚噻吩受体-聚噻吩-聚噻吩给体的三嵌段聚噻吩高分子结构，具有缺陷少、载流子损失率低和光转化率高的特点，因而可以用于有机薄膜太阳能电池领域，为制备出高光转化率的太阳能电池提供了一种理想的材料

新型给体-受体型聚合物的合成及其在本体异质结聚合物太阳能电池中的应用

设计、合成了侧链含有强吸电结构的丙二酸二丁酯受体单元与苯并[1,2-b:4,5-b′]二噻吩给体单元交替共聚物 PBDTDT, 研究了其热学、光学、电化学性质以及与受体PC71BM ([6,6]-苯基C71 丁酸甲酯)共混作为活性层制备成本体 异质结聚合物有机太阳能电池的光伏性质, 考察了PBDTDT 与PC71BM 不同比例时的光伏性能, 当聚合物PBDTDT 和 PC71BM质量比为1∶3 制备的器件, 其开路电压达到了0.82 V, 能量转换效率(PCE)为0.90%, 短路电流为3.25 mA/cm2, 填充因子FF 为0.338, 同时将其与同等工艺制备的poly(3-hexylthiophene) (P3HT)太阳能电池的光伏性能进行比较, 相 同工艺下制备的P3HT电池的开路电压仅为0.55 V, 由PBDTDT制备的电池开路电压比P3HT电池的开路电压高出0.29 V, 同时分析了PBDTDT 能量转换效率较P3HT 低的原因

Synthesis, crystal structure, and polymerization of butterfly-shaped thieno[3,2-b]thiophene oligomers

A series of new butterfly-shaped thieno[3,2-b]thiophene oligomers with phenyl and thiophene units were synthesized through Suzuki coupling and Stille coupling reactions. The optical and thermal properties of these materials can be tuned by varying both substituents and the conjugation length. The crystal structures have been determined and showed a syn- or anticlinal conformation in the crystal of molecule 4. The electronic properties of the monomers and their electropolymerization ability are discussed and rationalized as a function of their molecular structure. Moreover, stable cross-linked conjugated polymers were formed by electropolymerization

Enhanced photovoltaic performance of inverted polymer solar cells by tuning the structures of titanium dioxide

Inverted polymer solar cells using TiO2 film as electron transporting layer were fabricated with the structure of fluorine-doped tin oxide/TiO2 films/poly(3-hexylthiophene): [6,6]-phenyl-C61-butyric acid methyl ester/Poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate)/Ag. By tuning the crystalline structure of TiO2 films, the photovoltaic performance of the deviceswas remarkably enhanced. TiO2 was prepared by sol-gel method and their structures, morphologies and transmittance were characterized by X-ray diffraction, scanning electron microscope, and UV-visible spectrophotometer. Interestingly, for TiO2-3 film, which was prepared with tetrabutyl titanate, acetyl acetone and ethanol in a ratio of 1:0.5:6, the open-circuit voltage and fill factor of the device were up to 0.6 V and 64.8%, respectively, and the power conversion efficiency of TiO2-3 film was achieved up to 3.56% with the current density of 9.18 mA/cm2 under an AM 1.5 G (100 mW/cm2) irradiation intensity. In the meanwhile, the stabilities of these devices were also studied and results showed that our work was better than the corresponding devices of conventional structure

一种含氟菲并咪唑类衍生物及其合成方法和应用

本发明提供了一种含氟菲并咪唑类衍生物，及其制备方法与应用，具体地，本发明提供了一种具有式I结构的化合物：其中，R的定义如说明书中所述。本发明的化合物可以用于制备发光材料，或用于制备电致发光器件，具有稳定性好，高性能、高效率的特点，尤其适用于制备红、绿、蓝、黄四种颜色光的电致发光器件。<img file="DDA0000418366830000011.GIF" wi="584" he="440" -