- Phosphine oxide-functionalized polyfluorene derivatives: Synthesis, photophysics, electrochemical properties, and electroluminescence performance
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A series of phosphine oxide-functionalized polyfluorene derivatives, PFH-PO-40-1 (P1), PFH-PO-20-1 (P2), PFH-PO-10-1 (P3), and PFH-PO-1-1 (P4), were prepared via a palladium-mediated Suzuki cross-coupling reaction. The structures and purities of all polymers were fully characterized by 1H and 13C NMR, UV-vis and photoluminescent spectroscopy, gel permeation chromatography, and TGA/DSC. Their emission features showed single broad peaks at about 445 nm in film, compared with those in dilute solutions, which might be caused by some degree of aggregation in the excited states of the backbones. The best electroluminescence (EL) performance of these polymers with configuration of ITO/PEDOT:PSS/Polymer/Alq3/LiF/Al was obtained from P1 (current efficiency was 4.2 Cd/A at 6V).
- Guo, Zengshan,Liu, Deang,Wang, Cheng,Pei, Jian,Zhou, Zhanglin,Zhao, Lihua,Gibson, Gary,Brug, James,Lam, Sity,Mao, Samuel S.
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- Polytellurophenes with properties controlled by tellurium-coordination
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Coordinated control: Owing to their numerous synthetic challenges, polytellurophenes are a virtually unexplored class of conjugated polymers. A new dihalogenated bitellurophene monomer has been synthesized and its polymerization under palladium-catalyzed conditions was optimized. The resulting polytellurophenes are stable compounds with distinct optoelectronic properties that can be controlled by coordination with bromine (see picture). Copyright
- Jahnke, Ashlee A.,Howe, Graeme W.,Seferos, Dwight S.
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- CdSe/ZnS Nanoparticle composites with amine-functionalized polyfluorene derivatives for polymeric light-emitting diodes: synthesis, photophysical properties, and the electroluminescent performance
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A series of amine-functionalized poly(9,9-dihexylfluorene) (PFH) derivatives, PFH-NH2F39-1 (P1), PFH-NH2F-19-1 (P2), PFH-NH2F-9-1 (P3), and PFH-NH2F-17-3 (P4), and PFH-NH 2F-4-1 (P5), were developed to form organic/inorganic hybrid composites with CdSe/ZnS nanoparticle for polymeric light-emitting diodes (LEDs). The structures and purities of all desired polymers were fully characterized by 1H and 13C NMR, UV-vis and photoluminescent spectroscopy, gel permeation chromatography, elemental analyses. The hybrid nanocomposites were in situ formed through these amino-functionalized polyfluorene derivatives doped with core-shell CdSe/ZnS quantum dots (QDs). The detailed characterizations of their photophysical properties revealed that rapid Foerster energy transfer from the conjugated polymers to the redemitting QDs afforded an efficient red color emission. The preliminary polymeric LEDs fabrication with the configuration of ITO/DB/nanocomposites/Al achieved red emission for the in situ prepared hybrid nanocomposites. The investigation of device performance indicates that these nanocomposites are promising red light-emitting polymeric LED materials with good performance in providing excellent color purity, stability, and robustness. Such strategy provides us a platform to achieve red-emitting hybrid nanocomposites as the active materials for LEDs.
- Guo, Zeng-Shan,Zhao, Lihua,Pei, Jian,Zhou, Zhang-Lin,Gibson, Gary,Brug, James,Lam, Sity,Mao, Samuel S.
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- Molecular Weight Engineering in High-Performance Ambipolar Emissive Mesopolymers
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Mesopolymers with high solubility, free of structural defects, and negligible batch-to-batch variation open a new avenue for organic optoelectronics. Organic light emitting transistors that combine the functions of organic light-emitting diodes and organic field-effect transistors. However, charge transport ability and light emitting strength are contradictory within one conjugated polymer. Herein, three low-molecular-weight mesopolymers with thienopyrroledione–benzothiadiazole repeating units (meso-TBTF) were obtained. The mesopolymers show strong solid-state emission and high ambipolar carrier mobility. The molecular weights of meso-TBTF can be tuned by polymerization temperature. The mesopolymers have photoluminescence quantum yields (PLQY) of about 50 % in solution and 10 % in solid state. Polymer light emitting diodes of this material are fabricated to explore its potential use in optoelectronic devices.
- Guo, Xiaofei,Zhang, Yihan,Hu, Yongxu,Yang, Jiaxin,Li, Yang,Ni, Zhenjie,Dong, Huanli,Hu, Wenping
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supporting information
p. 14902 - 14908
(2021/06/11)
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- An ultra-highly sensitive and selective self-enhanced AIECL sensor for public security early warning in a nuclear emergencyviaa co-reactive group poisoning mechanism
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The worldwide application of nuclear power has created the potential risk of a nuclear accident, which has been a challenge to public security. In nuclear leakages, I2radioisotopes would cause rapid, global pollution. Therefore, highly sensitive and selective I2sensors exhibit their significance in nuclear accident early warnings and treatments. Herein, a conjugated polymer was developed for I2vapor monitoring with an ultra-low limit of detection (LOD). This polymer, modified with a tertiary amine as a co-reactive group, exhibits aggregation-induced electrochemiluminescence (AIECL) and self-enhanced ECL behaviors. It is noteworthy that the tertiary amine also acts as I2vapor capturing and sensing groups to give a LOD of 0.13 ppt. Excellent selectivity was obtained in various interfering atmospheres. A new mechanism was discovered for designing vapor sensors, which is summarized as co-reactive group poisoning (CGP). To meet the high efficiency requirement of nuclear emergency monitoring, an I2sensor modified screen printed carbon electrode was used due to its low cost, lack of need for pretreatment and suitability for mass production. A matching upwardly photosensitive ECL dark box was further designed. This study reports ECL vapor monitoring for the first time and provides a novel strategy for early warning of a nuclear emergency, suggesting its significance in environmental and public security fields.
- Hua, Daoben,Liu, Peng,Pan, Jian-Bin,Wang, Ziyu,Wu, Xinqi,Xu, Jing-Juan,Xu, Meiyun,Zhang, Nan
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supporting information
p. 12584 - 12592
(2021/06/14)
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- Fluorene derivative fluorescent material, preparation method thereof, and application of fluorene derivative fluorescent material in detecting gas-phase phthalate plasticizers
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The invention provides a fluorene derivative fluorescent material as shown in a formula (I), a preparation method thereof, and an application of the fluorene derivative fluorescent material in detecting gas-phase phthalate plasticizers, wherein the fluore
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Paragraph 0106-0107; 0111
(2020/02/14)
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- [n]-Cyclo-9,9-dibutyl-2,7-fluorene (n=4, 5): Nanoring Size Influence in Carbon-Bridged Cyclo-para-phenylenes
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For the last ten years, ring-shaped π-conjugated macrocycles possessing radially directed π-orbitals have been subject to intense research. The electronic properties of these rings are deeply dependent on their size. However, most studies involve the flag
- Sicard, Lambert,Lucas, Fabien,Jeannin, Olivier,Bouit, Pierre-Antoine,Rault-Berthelot, Jo?lle,Quinton, Cassandre,Poriel, Cyril
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supporting information
p. 11066 - 11072
(2020/05/04)
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- NITROGEN-CONTAINING COMPOUND AND COLOR CONVERSION FILM COMPRISING SAME
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The present specification relates to a compound containing nitrogen, and a color conversion film, a backlight unit, and a display device, including the same.
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Paragraph 0137-0138
(2019/08/02)
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- Synthesis and properties of dicarbazolyltriphenylethylene-substituted fluorene derivatives exhibiting aggregation-induced emission enhancement
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Two novel dicarbazolyltriphenylethylene-substituted fluorene derivatives DctF and Dct2F were synthesized by the Wittig-Horner and Suzuki coupling reactions. It was reasoned that introducing linear alkyl chains into the fluorene structure could facilitate the deposition of high-quality films by an economical and simple process. The thin solid films of DctF and Dct2F show strongly enhanced emissions in comparison to their dilute solutions, which indicate the aggregation-induced emission enhancement (AIEE). Their decomposition temperatures (Td) exceed 400°C and the glass transition temperature (Tg) of DctF is 105°C. The maximum fluorescence emission wavelengths are in the region of 458-469 nm.
- Zhang, Qiang,Huang, Tian,He, Xing,Zhao, Zhuo-Ran,Zhao, Xin
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- Stepwise Bay Annulation of Indigo for the Synthesis of Desymmetrized Electron Acceptors and Donor-Acceptor Constructs
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A selective stepwise annulation of indigo has been demonstrated as a means of providing both monoannulated and differentially double-annulated indigo derivatives. Disparate substitution of the electron accepting bay-annulated indigo system allows for fine control over both the electronic properties as well as donor-acceptor structural architectures. Optical and electronic properties were characterized computationally as well as through UV-vis absorption spectroscopy and cyclic voltammetry. This straightforward method provides a modular approach for the design of indigo-based materials with tailored optoelectronic properties.
- Kolaczkowski, Matthew A.,He, Bo,Liu, Yi
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supporting information
p. 5224 - 5227
(2016/11/02)
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- Star-Shaped Single-Polymer Systems with Simultaneous RGB Emission: Design, Synthesis, Saturated White Electroluminescence, and Amplified Spontaneous Emission
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A three-armed star-shaped single-polymer system comprising tris(4-(3-hexyl-5-(7-(4-hexylthiophen-2-yl)benzo[c][1,2,5]thiadiazol-4-yl)thiophen-2-yl)phenyl)amine (TN) as red emissive cores, benzothiadiazole (BT) as green emissive dopants, and polyfluorene (
- Liu, Cheng-Fang,Jiu, Yuanda,Wang, Jianyun,Yi, Jianpeng,Zhang, Xin-Wen,Lai, Wen-Yong,Huang, Wei
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p. 2549 - 2558
(2016/05/10)
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- Using low generation dendrimers as monomers to construct dendronized hyperbranched polymers with high nonlinear optical performance
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By combining the structure of hyperbranched polymer and dendrimer, two second-order nonlinear optical (NLO) dendronized hyperbranched polymers, PG1 and PG2, were prepared with satisfactory yields through the Suzuki coupling reaction using low generation d
- Wu, Wenbo,Xu, Zhen,Li, Zhen
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supporting information
p. 8122 - 8130
(2015/05/20)
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- ORGANIC SEMICONDUCTOR MATERIAL, PREPARATION METHODS AND USES THEREOF
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Disclosed are organic semiconductor material, preparation methods and uses thereof. The organic semiconductor material is shown as the following formula (P), in which R1, R2, R3, m, n, x and y are defined as the description. The said organic semiconductor material can be used in organic solar cell, organic field effect transistor, organic electroluminescence element, organic optical storage, organic non-linear material or organic laser element.
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Paragraph 0049; 0057-0061
(2013/11/19)
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- Synthesis and electroluminescence properties of white-light single polyfluorenes with high-molecular weight by click reaction
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We reported a new way to synthesize single-chain white light-emitting polyfluorene (WPF) with an increased molecular weight using azide-alkyne click reaction. Four basic polymers with specific end-capping, which exhibited high-glass transition temperatures (Tg > 100 °C) and excellent thermal stability, were used as foundations of the WPF's synthesis; a blue-light polymer (PFB2) end-capped with azide groups can easily react with acetylene end-capped polymers (PFB1, PFG1, and PFR1, which are emitting blue-, green- and red-light, respectively) to form triazole-ring linkages in polar solvents such as N,N-dimethylforamide/toluene co-solvent at moderate temperature of 100 °C, even without metal-catalyst. Several WPFs that consist of these four basic polymers in certain ratios were derived, and the polymer light-emitting diode device based on the high-molecular weight WPF was achieved and demonstrated a maximum brightness of 7551 cd/m2 (at 12.5 V) and a maximum yield of 5.5 cd/A with Commission Internationale de l'Eclairage coordinates of (0.30, 0.33) using fine-tuned WPF5 as emitting material.
- Lo, Chih-Nan,Hsu, Chain-Shu
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p. 3355 - 3365
(2012/05/04)
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- On the degradation process involving polyfluorenes and the factors governing their spectral stability
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This study deals with an investigation of the spectral stability of differently structured polyfluorenes (PFs), deprived of 9-H defects, embodying 9,9-dialkylfluorene (P1), 9,9-diarylfluorene (P2), or 9,9-diarylfluorene/9,9- dibenzylfluorene units in a 1:1 alternating fashion (P3). Thermal annealing or UV irradiation carried out on films of P1-P3 in air revealed that their typical blue photoluminescence is invariably stained, independently of their 9-substitution, by the appearance of the low-energy band (g-band) pointing out a remarkable effect of light on the degradation process. A more comprehensive picture of the degradation pathway is proposed, including as key step a light-promoted formation of a PF radical cation generated by aerobic oxidation (photoluminescence test) or p-doping (cyclic voltammetry test). The blue emission of P1-P3 could successfully be preserved by dispersing them into a higher band gap matrix, such as polyvinylcarbazole (PVK), indicating a fundamental role of the intermolecular interactions between PF chains in the appearance of the low-energy emission band. Comparison between the optical behavior of suitably prepared PFs containing either fluorenone moieties (PFK) or 9-(bis-methylsulfanyl-methylene)fluorene moieties (PFS) holds regions of planarity within the PF backbone (inducing local intermolecular interactions) and not the fluorenone charge-transfer emission as responsible of the g-band of degraded PFs.
- Grisorio, Roberto,Allegretta, Giovanni,Mastrorilli, Piero,Suranna, Gian Paolo
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p. 7977 - 7986
(2012/04/23)
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- Synthesis and energy-transfer properties of hydrogen-bonded oligofluorenes
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A set of fluorene oligomers has been synthesized by stepwise palladium-catalyzed (Suzuki) couplings of fluorene monomers. Ureidopyrimidinones (UPy), functional groups that can dimerize via quadruple hydrogen bonds, were attached to both ends of the oligof
- Dudek, Stephen P.,Pouderoijen, Maarten,Abbel, Robert,Schenning, Albertus P. H. J.,Meijer
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p. 11763 - 11768
(2007/10/03)
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