Synthesis of two crown ether surfactants, n-decatyl-12-crown-4 and n-decatyl-15-crown-5. Their structures have been identified by IR, MS and? 1?HHMR. Crown ether surfacants are expected to be used not only to separtbe and richen metal ons, such as IA, IIA and rare earth metals, but also phase transfer catalyst and capsule catalyst.

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Novel efficient green electroluminescent conjugated polymers based on fluorene and triarylpyrazoline for light-emitting diodes

Journal of Materials Chemistry (2004)

Qiang Peng Zhiyun Lu Yan Huang Minggui Xie Dan Xiao

A series of novel light-emitting conjugated polymers based on fluorene and triarylpyrazoline were synthesized in good yields through Suzuki coupling reactions. The resulting polymers were characterized by NMR, FT-IR, elemental analysis, DSC, TGA and GPC. These polymers possess excellent thermal stability with glass transition temperatures (Tg) of 80–162 °C and onset decomposition temperatures (Td) of 376–387 °C. Cyclic voltammetry studies revealed that these polymers have good hole and electron transporting properties with LUMO energy levels of −2.97 to −2.98 eV and HOMO energy levels of −5.71 to −5.81 eV. All the polymers emit green fluorescence with very high photoluminescence (PL) quantum yields of 45–59%. Polymer light-emitting diodes (PLEDs) with the configuration ITO/PEDOT/polymer/Ba/Al were fabricated. All these devices showed bright green emission peaking at 494–500 nm with high maximum external quantum efficiencies of 0.6–2.53% and low turn-on bias voltages. The good light-emitting properties indicate that these polymers are new and promising candidates for electroluminescent materials that can be used to fabricate efficient polymer light-emitting diodes.

HOMO/LUMO

Polyfluorene

Quantum Efficiency

Thermal Stability

Green-light

10.1039/b313160b

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Synthesis of diaza-crown-ether cholesteric liquid crystals

Liquid Crystals (1996)

Minggui Xie Shi-Kui Liu Gang-Liu Long-Zhang Li Qing Jiang

Abstract Five diaza-crown-ethers were synthesized and four of them shown to have smectic liquid crystalline properties. Their properties were determined by DSC and polarized microscopy. This type of smectogenic diazacrown ether has not been reported so far. A novel lyotropic crown ether liquid crystal was obtained from the thermotropic crown ether liquid crystal 7.

Thermotropic crystal

Lyotropic

Lyotropic liquid crystal

Polarized light microscopy

10.1080/02678299608032839

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New series of highly phenyl‐substituted polyfluorene derivatives for polymer light‐emitting diodes

Journal of Polymer Science Part A Polymer Chemistry (2004)

Qiang Peng Minggui Xie Yan Huang Zhiyun Lu Dan Xiao

Abstract A new series of highly phenyl‐substituted polyfluorene derivatives were synthesized and characterized. The resulting polymers were amorphous and showed excellent solubility in common organic solvents, such as chloroform, tetrahydrofuran, xylene, toluene, chlorobenzene, and so forth. All possessed satisfied thermal stability with glass‐transition temperatures ( T g 's) in the range of 79–115 °C. They emitted blue light with photoluminescent (PL) maximum peaks at about 408–412 nm in thin films. The PL efficiencies of the polymer films were measured around 30–33%. The highly phenylated pendants improved the T g of polyfluorene without forming defects in the polymers and reduced their tendency to form aggregate/excimers. Polymer light‐emitting diodes were fabricated from these polymers with the configuration of indium tin oxide/polyethylenedioxythiophene:polystyrene sulfonic acid/polymer/Ba/Al, which emitted bright blue light with maximum peaks at 418–420 nm. The maximum external quantum efficiencies of these devices were 0.41–0.6%. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2985–2993, 2004

Polyfluorene

Polystyrene

Chlorobenzene

Thermal Stability

Tetrahydrofuran

10.1002/pola.20111

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Conjugated polymer materials and their light-emitting diodes

Chemical Research and Application (2004)

Minggui Xie

Conjugated polymers are promising organic semi-conducting materials.This article reviews the development of conjugated polymer light-emitting materials,introduces the principle of polymer light-emitting diodes (PLEDs),and discusses the development prospect and exciting problems of PLEDs.

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Novel conjugated polymers containing fluorene and 1-(2-benzothiazolyl)-3,5-diphenylpyrazoline Unit with Efficient Photoluminescence

Polymer Bulletin (2006)

Huaxi Zhang Hao Chen Ying Li Qing Jiang Minggui Xie

Thermal Stability

Spin Coating

10.1007/s00289-006-0541-3

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Novel light-emitting polymers derived from fluorene and maleimide

Journal of Materials Chemistry (2003)

Qiang Peng Zhiyun Lu Yan Huang Minggui Xie Dan Xiao

A series of novel soluble light-emitting polymers derived from fluorene and maleimide were synthesized by a palladium-catalyzed Suzuki coupling reaction. The resulting polymers were characterized by NMR, FT-IR, elemental analysis, DSC, TGA and GPC. These polymers show very strong yellow PL emission and good solubility in common organic solvents, such as CH2Cl2, CH3Cl, toluene and xylene. DSC and TGA studies reveal that the novel polymers possess excellent thermal stability with high glass transition temperatures (Tg) and onset decomposition temperatures (Td). Cyclic voltammetry measurements demonstrated that the polymers have high electron affinity and good hole and electron transporting properties. Light emitting diodes (LEDs) with the configuration ITO/PEDOT : PSS/polymer/Mg:Ag were fabricated. All the LEDs show low turn-on voltages and good electroluminescence properties with yellow emission.

Maleimide

Thermal Stability

Suzuki reaction

10.1039/b304613c

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Citations (32)