Haipeng Ji

Zhengzhou University

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Zhaohui Huang

China University of Geosciences (Beijing)

Deliang Chen

Dongguan University of Technology

Minghao Fang

China University of Geosciences (Beijing)

Shasha Yi

Zhengzhou University

Zongtao Zhang

Zhengzhou University

Conghua Lu

Tianjin Chengjian University

Xiaowen Wu

China University of Geosciences (Beijing)

Yangai Liu

China University of Geosciences (Beijing)

Liying Zhang

Dalian University of Technology

Xue Han

ShanghaiTech University

Cooperative Institutions

Chinese Academy of Sciences

Zhengzhou University

China University of Geosciences (Beijing)

Tianjin University

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Jilin University

Northeastern University

Harbin Institute of Technology

Huazhong University of Science and Technology

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Characterization of anion–cationic surfactants modified montmorillonite and its application for the removal of methyl orange

Chemical Engineering Journal (2011)

Daimei Chen Jian Chen Xinlong Luan Haipeng Ji Zhiguo Xia

Cationic polymerization

Methyl orange

Langmuir adsorption model

10.1016/j.cej.2011.05.013

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Citations (202)

A Negative-Thermal-Quenching Phosphor Achieved by Energy Transfer

Xin Min Cheng‐Yen Lao Haipeng Ji Xiaowen Wu yan'gai liu

Phosphor-converted white light-emitting diodes (pc-wLEDs) are drawing ever-increasing attention towards electronic applications. However, thermal quenching, the intensity decay with increasing temperature, presents a significant challenge for high power operation. We reverse the effect with a negative-thermal-quenching property based on energy transfer from one luminescent center to another center. The LaMgAl11O19: Er3+, Sm3+ (LMA: LaMgAl11O19: Er3+, Sm3+) phosphor has been designed, which shows a positive relationship between emission intensity and operating temperature up to 573 K (300 °C). As the temperature rises, energy transfer from Er3+ to Sm3+ occurs with higher efficiency because of stronger ionic vibration. As a result, the phosphor luminescence intensity at elevated temperatures is enhanced. Our design for negative-thermal quenching phosphor represents a strong candidate for application in high-power pc-wLEDs or lasers at higher temperatures. It also has potential for wide-temperature-sensing-range radiometric optical thermometry applications.

Thermal transfer

10.2139/ssrn.4597036

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Macromol. Rapid Commun. 7/2016

Macromolecular Rapid Communications (2016)

Jixun Xie Chuanyong Zong Xue Han Haipeng Ji Juanjuan Wang

Front Cover: A redox-driven switch between wrinkled and dewrinkled states on polyaniline film is presented. This switch is derived from the reversible transition between the redox states of polyaniline (e.g., emeraldine salt/leucoemeraldine base or emeraldine salt/pernigraniline base) that are involved in different redox environments, coupled with the corresponding volume expansion/shrinkage of polyaniline film. Further details can be found in the article by J. Xie, C. Zong, X. Han, H. Ji, J. Wang, X. Yang, and C. Lu* on page 637.

Base (topology)

Shrinkage

10.1002/marc.201670027

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Mn<sup>4+</sup>-doped Red-emitting Oxyfluoride Phosphors with Intense Zero Phonon Line

Chinese Journal of Luminescence (2023)

Qiao QU Wenrui ZHANG Lulu HE Haipeng Ji

Mn4+离子2Eg→4A2g跃迁是宇称和自旋禁戒跃迁,在Mn4+激活荧光粉中获得该跃迁的强零声子线(Zero Phonon Line,ZPL)荧光既有科学意义又有应用价值。本文对具有强ZPL发射特征的Mn4+激活氟氧化物红光荧光粉的制备、晶体结构和荧光性质进行总结。发现了一些规律:目前强ZPL发射氟氧化物荧光粉中心阳离子有Nb5+/Mo6+/Ta5+/W6+四种,Mn4+在其中掺杂时都为对高价态离子的不等价取代;基质晶格所含八面体形成畸变是获得强ZPL发射的必要条件;Mn4+在部分氟氧化物中ZPL可强于Stokes ν6声子伴峰,而在部分氟氧化物中ZPL又弱于ν6峰强度;强ZPL发射Mn4+激活氟氧化物荧光粉中ZPL波长位于619~628 nm之间,与Mn4+在常见氟化物中的发光能量接近;ZPL与ν6峰的强度比不仅与基质化学组成有关,对于某一荧光粉,该比值也随制备方法的改变而变化。

Line (geometry)

Zero (linguistics)

10.37188/cjl.20220405

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Citations (3)

Microwave-assisted synthesis of hierarchically porous Co3O4/rGO nanocomposite for low-temperature acetone detection

Journal of Colloid and Interface Science (2021)

Yawu Gao Deliang Chen Xinghui Hou Ying Zhang Shasha Yi

Specific surface area

Nanomaterials

10.1016/j.jcis.2021.03.041

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Citations (42)

Valence State Control of Manganese in MgAl₂O₄:Mn⁴⁺ Phosphor by Varying the Al₂O₃ Crystal Form

Journal of Inorganic Materials (2020)

Zhaowu Wang Haipeng Ji Feixiang Wang Xinghui Hou Shasha Yi

调控 Al 2 O 3 晶型控制 MgAl 2 O 4 :Mn 4+ 荧光粉中 Mn 价态研究(1. 郑州大学材料科学与工程学院, 郑州 450001; 2. 东莞理工学院材料科学与工程学院, 东莞 523830)紫外-可见-近红外漫反射光谱技术来表征所合成荧光粉中 Mn 离子的价态及其演变。研究发现, 高 α/(α+γ)比铝源促进 Mn 2+ 形成, 而低 α/(α+γ)比铝源促进 Mn

10.15541/jim20200386

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Citations (4)

Large-Area Patterning of Polyaniline Film Based on in Situ Self-Wrinkling and Its Reversible Doping/Dedoping Tunability

Macromolecules (2015)

Jixun Xie Xue Han Chuanyong Zong Haipeng Ji Conghua Lu

Here we report a simple one-pot yet robust approach to fabricate large-scale wrinkle patterns with reversible acid-doping/base-dedoping tunability. A novel swelling-induced self-wrinkling mechanism is responsible for the in situ growth of wrinkled polyaniline (PANI) film on polydimethylsiloxane (PDMS) substrate. The spontaneously formed wrinkles with controlled microstructures such as the wavelength, spatial orientation, and location have been well regulated by PANI film thickness (via polymerization time and monomer concentration) and PDMS substrate modulus as well as the boundary conditions imposed by the substrate. The results indicate that the in situ self-wrinkling is highly desirable for patterning PANI film over large areas with the instability-driven morphologies, even in the case of curved surfaces employed. Interestingly, taking advantage of the swelling/deswelling capability via the unique acid doping/base dedoping of PANI, we have further realized unprecedented reversible modulation between the wrinkled and dewrinkled states. The involved physics underlying the complicated in situ self-wrinkling and the reversible doping/dedoping tunability has been revealed.

Polydimethylsiloxane

In situ polymerization

10.1021/ma5015287

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Citations (38)

Fe(NO3)3-assisted large-scale synthesis of Si3N4 nanobelts from quartz and graphite by carbothermal reduction–nitridation and their photoluminescence properties

Scientific Reports (2015)

Shuyue Liu Minghao Fang Zhaohui Huang Juntong Huang Haipeng Ji

Abstract The large-scale synthesis of Si 3 N 4 nanobelts from quartz and graphite on a graphite-felt substrate was successfully achieved by catalyst-assisted carbothermal reduction–nitridation. The phase composition, morphology and microstructure of Si 3 N 4 nanobelts were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy and high-resolution transmission electron microscopy. The Si 3 N 4 nanobelts were ~4–5 mm long and ~60 nm thick and exhibited smooth surfaces and flexible shapes. The Si 3 N 4 nanobelts were well crystallized and grow along the [101] direction. The growth is dominated by the combined mechanisms of vapor–liquid–solid base growth and vapor–solid tip growth. The Fe(NO 3 ) 3 played a crucial role in promoting the nanobelt formation in the initial stage. The room-temperature photoluminescence spectrum of Si 3 N 4 nanobelts consists of three emission peaks centered at 413, 437 and 462 nm, indicating potential applications in optoelectronic nanodevices.

Carbothermic reaction

10.1038/srep08998

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Citations (37)

Polarization‐Dependent Ultrasensitive Dynamic Wrinkling on Floating Films Induced by Photo‐Orientation of Azopolymer

Angewandte Chemie (2022)

Enping Liu Xiaoliang Zhang Haipeng Ji Qifeng Li Lele Li

Abstract Ubiquitous surface wrinkling has been well‐studied theoretically and experimentally. How to modulate the stress state of a liquid‐supported system for the unexploited wrinkling capabilities remains a challenge. Here we report a simple linearly‐polarized‐light illumination to spatiotemporally trigger ultrasensitive in situ dynamic wrinkling on a floating azo‐film. The smart combination of the liquid substrate with photoresponsive azo‐moieties leads to the light‐induced ultrafast wrinkling evolution, accompanied by unprecedented sequential wrinkling orientation conversion (from polarization‐parallel to polarization‐perpendicular). The involved different polarization‐dependent sequential photo‐orientation for azo side chains and azo‐grafted main chains of azopolymers is disclosed experimentally for the first time. Meanwhile, programmable dynamic wrinkling with all‐optical switchable surface topographies is available, which has wide application potentials in photoresponsive soft photonics.

10.1002/ange.202203715

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Citations (4)

Cyan-emitting LiBaBO3:Eu2+ phosphor: Crystal structure and luminescence property comparison with LiSrBO3:Eu2+

Chemical Physics Letters (2015)

Zhaohui Huang Haipeng Ji Minghao Fang Maxim S. Мolokeev Shuyue Liu

Cyan

Monoclinic crystal system

Rietveld Refinement

10.1016/j.cplett.2015.04.004

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Citations (18)