- Dual roles for promoting monomers to polymers: A conjugated sulfonium salt photoacid generator as photoinitiator and photosensitizer in cationic photopolymerization
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An efficient strategy for comprehensive utilization of the conjugated sulfonium salt photoacid generator (PAG), namely, 3-{4-[4-(4-N,N′-diphenylamino)-styryl]phenyl}phenyl dimethyl sulfonium hexafluoroantimonate, was developed through photoinitiated cationic photopolymerization (CP) of epoxides and vinyl ether upon exposure to near-UV and visible light-emitting diodes (LEDs; e.g., 365, 385, 405, and 425 nm). Photochemical mechanisms were investigated by UV–vis spectra, molecular orbital calculations, fluorescence, cyclic voltammetry, and electron spin resonance spin-trapping analyses. Compared with commercial PAGs, the prepared conjugated sulfonium salt generated H+, which can be used as photoinitiator. Moreover, the fluorescent byproducts from photodecomposition can be used as photosensitizer of commercial iodonium salt in the photoinitiating systems of CP. These novel D-π-A type sulfonium-based photoinitiating systems are efficient (epoxide conversion = 85–90% and vinyl conversion >90%; LEDs upon exposure to 365–425 nm) even in low-concentration initiators (1%, w/w) and low curing light intensities (10–40 mW cm?2).
- Jin, Ming,Wu, Xingyu,Malval, Jean Pierre,Wan, Decheng,Pu, Hongting
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Read Online
- Aniline metallofullerene derivative and preparation method thereof and regulation method for lifetime of excited-state aniline metallofullerene derivative
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The invention discloses an aniline metal fullerene derivative and a preparation method thereof and a regulation method for the lifetime of an excited-state aniline metallofullerene derivative. The preparation method of the aniline metallofullerene derivat
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Paragraph 0064
(2017/12/06)
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- Conjugated type sulfonium salt photoinitiator with double functions of photoinitiator and photosensitizer, preparation method and application of conjugated type sulfonium salt photoinitiator
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The invention relates to a conjugated type sulfonium salt photoinitiator with double functions of a photoinitiator and a photosensitizer, a preparation method and an application of the conjugated type sulfonium salt photoinitiator. The conjugated type sulfonium salt photoinitiator is applicable to excitation from near ultraviolet regions with wavelength of 313 nm, 365 nm, 385 nm, 405 nm and 425 nm to a visible region, so that efficient polymerization of various monomers is initiated; synthesis steps of the photoinitiator are simple, the purification is easy, the yield is high, and in the region of 300 nm-425 nm, the optical absorption property is good and the initiation efficiency is high; a product obtained after decomposition can further be taken as the photosensitizer and combined with commercial photoinitiators such as iodonium salt, sulfonium salt and the like to form an efficient photosensitization-initiated binary polymerization system, and the polymerization efficiency is higher; according to the application of the conjugated type sulfonium salt photoinitiator and photosensitizer to a photopolymerization system, cheap LEDs can be taken as excitation light sources in the near ultraviolet region-visible region, the initiating system has the advantages of low addition quantity, high initiation efficiency and wide light source application range, and resource conservation can be realized.
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- Superior upconversion fluorescence dopants for highly efficient deep-blue electroluminescent devices
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In this study, we revealed a new approach for the development of new triplet-triplet annihilation (TTA) materials with highly efficient deep-blue fluorescence via the incorporation of a styrylpyrene core and an electron-donating group. The resulting deep-blue emitters (PCzSP, DFASP, and DPASP) exhibit intramolecular charge transfer emissions with remarkably high emission quantum yields. The electroluminescent devices based on these three fluorophores as dopants using CBP as a host exhibit very high device efficiencies; in particular, the DPASP-doped device reveals an extremely high EQE of 12%, reaching the limit of a TTA-based device. The EL characteristics of DPASP-doped CBP-based devices at various doping concentrations (0-5%) suggest that the dopant DPASP is responsible for the TTA-type delayed fluorescence in the device; no delayed fluorescence was observed for the device using CBP as the host emitter. Moreover, when using DMPPP with ambipolar characteristics as the host, the deep-blue DPASP-doped device also gives outstanding performance with an EQE of nearly 11% with an extremely small efficiency roll-off, which was ascribed to the excellent charge balance in the emitting layer of the EL device. The TTA process of the SP-based dopants accounts significantly for the superior efficiencies of the EL devices.
- Chen, Yi-Hsiang,Lin, Chih-Chun,Huang, Min-Jie,Hung, Kevin,Wu, Yi-Ching,Lin, Wei-Chieh,Chen-Cheng, Ren-Wu,Lin, Hao-Wu,Cheng, Chien-Hong
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p. 4044 - 4051
(2016/07/07)
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- Linkage effects of linear D-π-A-π-D type diketopyrrolopyrrole- triphenylamine based solution-processable organic small molecule photovoltaic materials
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Four novel D-π-A-π-D-type small molecules (SMs) were synthesized and their π-linkage effects were investigated. Among them, SM2 with vinylene as the π-linkage exhibited better molecular coplanarity, reaching a relatively higher power conversion efficiency (PCE) of 3.76%. SM3 and SM4 with acetylene and acrylonitrile as π-linkages exhibited relatively higher open-circuit voltages (VOC) of 0.93 V and 0.90 V, respectively, owing to their deep-lying HOMO levels. These results gave an important guide for developing new materials in solution-processed small molecule solar cells.
- Ji, Changyan,Yin, Lunxiang,Wang, Lihui,Jia, Tao,Meng, Shixiang,Sun, Yingji,Li, Yanqin
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p. 4019 - 4026
(2014/05/20)
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- D-π-A-π-D type benzothiadiazole-triphenylamine based small molecules containing cyano on the π-bridge for solution-processed organic solar cells with high open-circuit voltage
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Two novel D-π-A-π-D structured small molecules composed of benzothiadiazole and triphenylamine were designed and synthesized. BDCTBT with cyano on the π-bridge exhibited a deep HOMO energy level, resulting in an impressive VOC of up to 1.04 V with a PCE of 3.85%, while non-cyano substituted BDETBT yielded a VOC of 0.94 V and a PCE of 1.99%.
- Zeng, Shaohang,Yin, Lunxiang,Ji, Changyan,Jiang, Xueying,Li, Kechang,Li, Yanqin,Wang, Yue
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supporting information
p. 10627 - 10629
(2012/11/07)
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