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Studies on phosphorescent organic light emitting devices (PhOLEDs) with phosphorescent emitter, fac-tris (2-phenylpyridine) iridium (Ir(ppy)(3)), show that the lifetime of triplet exciton is modified by surface plasmon coupling of Au nanoparticles (NPs). Interactions between the triplet exciton and gold (Au) nanoparticles (NPs) lead to a decrease in the exciton lifetime and result in the spontaneous emission decay rate of triplet exciton faster as the distance between the phosphorescent material and the Au NPs becomes smaller. This interaction reduces the efficiency roll-off of Au NPs containing device. These results provide new guides for device design to improve efficiency performance. 相似文献
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Guifen Zhu Wanwan Li Peiyun Wang Guohao Cheng Letian Chen Kaige Zhang Xiang Li 《Journal of separation science》2020,43(3):639-647
A novel green hydrophilic levofloxacin imprinted polymer was presented via one‐step polymerization in water using ionic liquid 1,6‐hexa‐3,3′‐bis‐1‐vinylimidazolium bromine with multiple hydrophilic groups and 2‐hydroxyethyl methacrylate as a co‐functional monomer. Adsorption experiment revealed that the ionic liquid significantly improved the water compatible of imprinted polymer, and the excellent recognition of molecularly imprinted polymer for levofloxacin in water corresponds to the synergetic effect of H‐bonding and the electrostatic and π–π interactions between the levofloxacin and co‐functional monomer. Furthermore, the adsorption process of the imprinted material towards levofloxacin fitted the Langmuir model, and the maximum binding amount of levofloxacin onto the imprinted and corresponding non‐imprinted polymer were 16.45 and 6.82 mg/g at 25°C, respectively. After optimizing the parameters affecting solid phase extraction performance, an enrichment and determination system was achieved to separate and detect levofloxacin from water and sediment samples with recoveries that ranged from 83.67 to 101.33% and relative standard deviation of less than 5.59%. 相似文献
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The plane strain compression of a rectangular block is numerically investigated for the study of dynamic shear band development
in thermo-elasto-viscoplastic materials from an internal inhomogeneity. As expected, it plays an important role in triggering
the onset of shear, localization as well as thermal softening. And the competition between the strain, strain-rate hardening
and thermal softening exists throughout the process. It is found that shear band develops at a 45-degree angle to the compression
axis. In the light of given patterns of deformation and temperature, shear band evolution accelerated by thermal softening
is retarded by the inertial effects. Interestingly, a similar temperature band is also formed along the trajectory of the
localized deformation band. The calculations also show the energy evolution during the coupled thermo-mechanical process of
shear band propagation. Finally, the mesh effect is discussed in terms of the numerical results from two different meshes.
The project is supported by the National Natural Sciences Foundation of China. 相似文献
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An experimental study of spallation in phenolic-resin based woven roving glass fibre reinforced composite material under uniaxial
strain condition is reported in this paper. Experiments were carried out with a 101 mm bore single-stage light gas gun. The
stress waves induced by plate impact propagate along the normal to glass fibre mats. The experiments show that the threshold
of incipient spallation in this material depends strongly on the duration of stress wave and that this incipient spallation
appears essentially in one layer. The criterion of spallation in this material given in this paper is in good agreement with
experimental results. Besides, the spallation in phenolic-resin based obliquely laminated woven roving glass fibre reinforced
composite material is also discussed in this paper. 相似文献
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Guoping Li Bingjie Zhang Jianwei Wang Hongyang Zhao Wenqiang Ma Letian Xu Weidong Zhang Kun Zhou Yaping Du Gang He 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(25):8556-8561
A series of electrochromic electron‐accepting poly(chalcogenoviologen)s with multiple, stable, and reversible redox centers were used as anodic materials in organic radical lithium‐ion batteries (ORLIBs). The introduction of heavy atoms (S, Se, and Te) into the viologen scaffold significantly improved the capacity and cycling stability of the ORLIBs. Notably, the poly(Te‐BnV) anode was able to intercalate 20 Li ions and showed higher conductivity and insolubility in the electrolyte, thus contributing to a reversible capacity of 502 mAh g?1 at 100 mA g?1 when the Coulombic efficiency approached 100 %. The charged/discharged state of flexible electrochromic batteries fabricated from these anodic materials could be monitored visually owing to the unique electrochromic and redox properties of the materials. This study opens a promising avenue for the development of organic polymer‐based electrodes for flexible hybrid visual electronics. 相似文献
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By adopting a phosphorescent host/guest system consisting of blue iridium complex as host and a series of phosphorescent dyes as guest, efficient and low-voltage monochromic organic light-emitting devices(OLEDs) were fabricated. The devices with blue iridium host have higher power efficiency than the device with the conventional host 4,4'-N,N'-dicarbazole-biphenyl. The enhancement of the maximum power efficiency in green phosphorescent device can reach 37.2%. Dichromatic white OLED could be achieved by simply adjusting the concentration of the orange dyes. At a brightness of 1000 cd/m2, the power efficiency of the white device is 8.4 lm/W with a color rendering index of 76. 相似文献
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A microring resonant wavelength demulti/multiplexer (MRRWDM) based on UV-written technology is designed. By using a double smooth octagon microrings structure, a 1 × 8 device around the central wavelength of 1550.918 nm with the wavelength spacing of 1.4 nm is presented. Analytical results based on coupled mode theory show that the 3 dB bandwidth is about 0.22 nm, the insertion loss is less than 0.7 dB, and the crosstalk is below ?47 dB for every output channel of the designed device without tolerances. 相似文献
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Yunpeng Sun Letian Cui Qiurong Li Pengfei Tang Yongyi Li Wenjun Xu Jun Luo Lingyi Kong 《中国化学快报》2022,33(1):516-518
Mufolinin A(1), a ring A-seco rearranged limonoid with an unprecedented ethyl at C-10 and novel 6/6/6/5 fused-ring skeleton, together with three new potential precursors(ring A-seco limonoids, 2–4) were isolated from Munronia unifoliolata. Their structures and absolute configurations were confirmed by nuclear magnetic resonance(NMR), high resolution electrospray ionization mass spectroscopy(HRESIMS), X-ray crystallography, electronic circular dichroism(ECD) calculations and NMR calculations with... 相似文献