JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 10
·
IF 1.866
Fei Fang,Fan Kong,Xueqin Zhang,Mengqi Lin,Yichi Zhang,Shounian Ding
A series of amphiphilic poly(N-vinyl carbazole) (PVK) block copolymers containing tris(8-hydroxyquinoline) aluminum (Alq 3 ) have been synthesized via reversible addition-fragmentation chain transfer (RAFT) radical polymerization with trithiocarbonate terminated polyethylene glycol (PEG) as a RAFT agent. The chemical structures of the block copolymers have been identified by 1 H nuclear magnetic resonance and Fourier transform infrared spectrometer. The analysis of gel permeation chromatography indicates that the polydispersity indices of the block copolymers are lower than 1.30. The results of thermogravimetric analysis show that the decomposition temperatures of the copolymers are higher than 330 ° C . The optical properties of the copolymers have been investigated and the obviously enhanced emission from Alq 3 has been found due to resonance energy transfer from PVK to Alq 3 . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44573.
研究领域:
高分子化学
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材料科学
·
光电子学
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纳米功能材料
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聚合物合成
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荧光材料
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能量转移
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Hao-Feng Lin,Xiao-Xu Yang,Song Chen,Ya-Ru Kang,Jue Wang,Zhen-Yu Jiang,Woochul Yang,Shulai Huang,Yan Xi,Xue-Dong Wang,Wan-Feng Xie
It has been demonstrated that organic semiconductor micro-/nanocrystals with multicolor emission/waveguide characterizations would be widely utilized as ideal building blocks for the next generation of miniaturized optical, electronic and logic operation devices. However, rational synthesis of one dimensional micro-/nanocrystals with multicolor emission and optical waveguide performances are highly desirable and still remain a challenge. Here, the DCM doped Alq 3 single-crystalline microrods are fabricated via a facile solution-exchange method. It is found that a redshift in light-emission frequency is extremely sensitive to the doping concentration of 4-(dicyano-methylene)-2-methyl-6-(4-dimethylamino-styryl)-4Hpyran (DCM) guest molecule. The green emission at 527 nm of Alq 3 is the main emitting peak when doping concentration of DCM in Alq 3 :DCM is less than 150:1. Then, when the doping concentration of DCM in Alq 3 :DCM is larger than 100:2 such as 100:10, the red emission at 635 nm becomes the dominant emitting peak, the redshift amounts can reach to roughly 108 nm. In addition, the DCM-doped Alq 3 microrods exhibit a lower optical loss of 0.019 dB/μm as a multicolored waveguide material. Therefore, it is demonstrated that the DCM-doped organic micro/nano crystals can be utilized as a promising building block for various optoelectronic components.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
·
2022
·
IF 2.358
Peng Zhang,Emmanuel Jacques,Laurent Pichon,Olivier Bonnaud
An organic ambipolar charge trapping non-volatile memory device is proposed based on tris(8-hydroxy quinoline) aluminum(Alq 3 )/ fullerene(C 60 )/pentacene double heterojunctions. The double heterojunctions were analyzed and compared with the sole heterojunction. Even though the Alq 3 /pentacene sole heterojunction shows a negative threshold voltage shift for programming under negative biasing, light illumination is required to efficiently erase. In contrast, for C 60 /pentacene sole heterojunction, the negative shift of threshold voltage is observed even with a positive erasing voltage. By combining the two trapping layers, a large memory window with fully-electrical programming and erasing is obtained. The efficient programming and erasing of the double heterojunctions structure are analyzed, sufficient electrons can be injected that enables the electrical erasing, and the negative shift of the threshold voltage under positive erasing voltage for the C 60 /pentacene structure is suppressed due to the suppression of the large built-in potential for the sole heterojunction, which can be verified by a large positive shift for the pentacene/C 60 /pentacene double heterojunctions.
研究领域:
材料科学
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电子工程
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2013
·Vol. 22
·期 11
·117805
·
IF 1.148
Zhang Xiao-Jin,He Zhi-Qun,Wang Jing,Mu Lin-Ping,Zhao Huan,Liang Chun-Jun,Zhuang Qi-Xin,Han Zhe-Wen
In this work, we report the preparation of a series of electroluminescent (EL) devices based on a high-performance polymer, poly(p-phenylene benzobisoxazole) (PBO), and their optoelectronic properties, which have been rarely explored. The device structure is optimised using a complex cathode structure of tris-(8-hydoxyquinoline) aluminium (Alq3)/LiF/Al. By tuning the thickness of the Alq3 layer, we improve the device efficiency dramatically in an optimized condition. Further analysis reveals that the Alq3 layer in the complex cathode structure acts as a hole blocker in addition to its electron-injection role. A green light emission with a maximum brightness of 8.7 × 103 cd/m2 and a moderate current efficiency of 4.8 cd/A is obtained. These values are the highest ever reported for PBO devices. The high operational stability demonstrated by the present device makes it a promising tool for display and lighting applications. A new material is added to the selection of polymers used in this field up to now.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Rongrong Guo,Xiaoyun Xu,Songmei Li,Yangyang Cheng,Junwei An,Mei Yu,Jinyan Zhong,Juan Du,Shubin Yang,Bin Li
Lithium bis((trifluoromethyl)sulfonyl)azanide (LiTFSI) based electrolytes have become the preferred electrolytes for lithium metal batteries (LMBs) due to their exceptional anode stability and ionic conductivity. However, challenges including unstable cathode electrolyte interface (CEI) formation and aluminum current collector (AlCC) corrosion have hindered the application of LiTFSI-based electrolyte in high-voltage LMBs. In this work, a universal passivation strategy is proposed and achieved with additive 8-hydroxyquinoline (8-HQ) in LiTFSI based electrolyte (ED-HQ). The 8-HQ additive preferentially decomposes on the cathode surface to generate Li 3 N, inducing the formation of inorganic-rich CEI with a uniform thickness of only 10 nm. The dense and homogeneous inorganic-rich CEI enables the cycling stability of the cathode. Meanwhile, the 8-HQ additive shows strong adsorption on the AlCC surface, which promotes the formation of a composite passivation layer consisting of an Aluminum-8-hydroxyquinoline (Alq 3 ) chelate layer and an AlF 3 /LiF inorganic layer, increasing the stable operating voltage of AlCC to 4.9 V and reducing the corrosion current density to one tenth. As a result, the joint effects enable Li||LiFePO 4 cells with ED-HQ electrolyte to achieve 89.8% capacity retention after 500 cycles at an elevated cutoff voltage of 4.5 V, demonstrating a viable pathway toward stable high-voltage LMB operation.
研究领域:
电化学
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储能
·
材料科学
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电池技术
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 29
·7083-7092
·
IF 5.066
Yajiao Song,Jianhua Lü,Bingxin Liu,Changli Lü
Thermo-responsive block copolymer brushes of PNIPAM-b-P(MQ-co-GMA) were successfully grafted from graphene oxide (GO) by consecutive reversible addition–fragmentation chain transfer (RAFT) polymerization based on the monomers of N-isopropylacrylamide (NIPAM), 5-(2-methacryloyl-ethyloxymethyl)-8-quinolinol (MQ) and glycidyl methacrylate (GMA). The 8-hydroxyquinoline units in the polymer brushes could coordinate with Al3+ to form green luminescent copolymer brushes containing tris(8-hydroxyquinoline)aluminum (Alq3) on the GO surface. The resulting fluorescent hybrid could be used as a nano-platform for the sensitive and robust detection of 2,4,6-trinitrophenol (TNP). The green fluorescence of the polymer brush modified GO hybrid in aqueous solution could be quenched by TNP via charge transfer and the observed linear fluorescence intensity change allowed the quantitative detection of TNP with a detection limit down to 2.38 × 10−9 M. The fluorescent nanohybrids exhibited a robust temperature-responsive behavior as a result of the conformation change in PNIPAM chains of polymer brushes.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）