Nanoscale
·
2016
·Vol. 8
·期 22
·11565-11570
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IF 7.76
Dan Wang,Dan Wu,Di Dong,Wei Chen,Junjie Hao,Jing Qin,Bing Xu,Kai Wang,Xiaowei Sun
Compared to organic/inorganic hybrid perovskites, full inorganic perovskite quantum dots (QDs) exhibit higher stability. In this study, full inorganic CsPbX3 (X = Br, I and mixed halide systems Br/I) perovskite QDs have been synthesized and interestingly, these QDs showed highly polarized photoluminescence which is systematically studied for the first time. Furthermore, the polarization of CsPbI3 was as high as 0.36 in hexane and 0.40 as a film. The CsPbX3 perovskite QDs with high polarization properties indicate that they possess great potential for application in new generation displays with wide colour gamut and low power consumption.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2012
·Vol. 4
·期 5
·1598-1605
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IF 5.914
Jing Liu,Yiwu Mao,Jianping Ge
Nonmagnetic polymer colloids have been assembled into colloidal photonic crystals in a ferrofluid by applying an external magnetic field based on the dipole–dipole interactions of “magnetic holes”. The photonic crystal disassembles immediately when the magnetic field is removed. The mechanism of assembly can be explained by two simultaneous processes: phase separation and colloidal assembly. In this work, increasing the size of the building blocks still produces colorful photonic crystals due to their 2nd order diffraction. With a larger building block, the magnetic response between the polymer colloids is greatly enhanced so that an instant and reversible assembly/disassembly can be realized in a much weaker magnetic field and lower ferrofluid concentration. Based on these investigations, a magnetically controlled photonic display unit has been fabricated, which works in a weak magnetic field, has stable reflection signals and possesses fast and reversible on/off switching of reflections.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Xiaoling Niu,Xiaojing Wu,Heng Zhou,Yongliang Liu,Zhen Feng,Min Tian,Shengbo Zhu
A novel aggregation-induced emission (AIE)-active liquid crystal of DC-DBM bearing rod-like dicyanodistilbenic (DC) core and alky chain was synthesized by Knoevenagel condensation reaction. It shows remarkable AIE and liquid crystal properties, and undergoes obvious mechano- and thermo- fluorochromic behaviors. The color of DC-DBM changed from green to light-yellow after grinding, and returned after fuming with organic solvent under UV light. It also took a smart response upon temperature accompanying with obvious change of colors. The force and temperature responsive phenomena were all associated with changes in the modes of molecular packing and phase states. The stimuli-responsive mechanism were unveiled by powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC). Moreover, DC-DBM displayed electro-tunable character of luminescence after mixing it with the nematic liquid crystal of 5CB. The fluorescent emission intensity with voltage showed a linear relationship from 10 to 30 V. The results showed that the AIE-active liquid crystal was a multi-function fluorescence material, which could be used in the fields of mechano-sensors, temperature detectors, security encryption and displays.
研究领域:
材料科学
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光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·Vol. 63
·期 8
·1891-1897
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IF 3.6
WenJie Zhu,Muke Zhang,JianJun Zeng,Yufei Tang,Xin Li,Jinchao Li,Liang Chen,Qin Chen,Aibing Lu,Qianqian Liang,Yaping Zhang
The rapid development of flexible organic light-emitting diode displays has intensified the demand for polyimide (PI) films with enhanced thermal and mechanical properties. In this study, a dibenzimidazole diamine monomer is synthesized, and a series of PI films are fabricated with the molar ratio of diamine monomer adjusted to optimize film performance. The optimized PI-1 film exhibits a low coefficient of thermal expansion (5.0 ppm K −1 ), high glass transition temperature (452 °C) and 5% weight loss temperature (550 °C), improved tensile strength (168 MPa) and a modulus of elasticity (5.2 GPa) that meet the requirements for flexible display applications. The findings of this study provide valuable guidance for fabricating advanced PI films based on monomer composition and rational molecular structural design. Graphical
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 7
·5389-5394
·
IF 3.086
Xiaoming Chen,Zhangping Xu,Sai Mi,Jianming Zheng,Chunye Xu
Novel spray-processable red-to-transmissive electrochromic polymers poly[3,4-di(2-ethylhexyloxy)thiophene-co-thiophene-co-3,4-di(methoxy)thiophene] with different monomer ratios have been synthesized and the electrochromic properties such as optical contrast, switching speed and long term switching stability were characterized. The incorporation of the simple thiophene unit into the polymer with the monomer ratio DEHOT : Th : DMOT = 1 : 0.2 : 0.8 successfully improves the switching speed (t95 = 1.6 s) with a high optical contrast ΔTmax = 56% at 518 nm, which constitutes a forward step toward the dynamic electrochromic displays.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 11
·2008453
·
IF 18.808
Pai Liu,Yajun Lou,Shihao Ding,Wenda Zhang,Zhenghui Wu,Hongcheng Yang,Bing Xu,Kai Wang,Xiao Wei Sun
InP quantum dots (QDs) are emerging as promising materials for replacing cadmium-based QDs in view of their heavy metal-free and tunable luminescence. However, the development of InP QD materials still lags due to the expensive and flammable phosphorus precursors, and also the unsatisfactory repeatability caused by the fast nucleation rate. Adopting lowly reactive P precursor aminophosphine can overcome this issue, but their low photoluminescence quantum yield (PLQY) and widening line widths do not apply to the practical application. Through engineering, the core-shell structure of QD, significantly promoted green emissions of QDs were obtained with PLQY of 95% and full width and half maximum (FWHM) of 45 nm, which demonstrated the highest PLQY record obtained from the aminophosphine system. Moreover, due to the residue halogen atoms on the QD surface as inorganic ligands to prevent further oxidization, these InP QDs demonstrated the ultra-long operational lifetime (over 1000 h) for QDs based color enhancement film. By optimizing the device structure, an inverted green InP quantum dot light-emitting diode (QLED) with external quantum efficiency (EQE) of 7.06% was also demonstrated, which showed a significant promise of these InP QDs in highly effective optoelectronic devices.
研究领域:
材料科学
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纳米技术
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光电材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53082
·
IF 3.057
Yuanhao Zhang,Yubo Zhou,Zhen Wang,Jingling Yan
Colorless polyimide (CPI) films showed great potential for flexible display applications due to their unique combination of excellent optical transparency, and outstanding thermal and mechanical properties. Herein, a series of colorless poly(amide-imide)s were prepared via a conventional two-step method, using 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl)benzidine (TFMB), and 4,4′-diaminobenzanilide (DABA) as the monomers. The thermal, mechanical, and optical properties of these copolymers were optimized by adjusting the molar ratios of these monomers. The amide linkages significantly improved the mechanical properties and dimensional stability of the resultant CPI films due to strong hydrogen bonding interactions. In particular, CPI-f films with monomer compositions of TFMB (50 mol%), DABA (50 mol%), 6FDA (50 mol%), and CBDA (50 mol%) exhibited tensile strength of 177 MPa, modulus of 5.5 GPa, coefficient of thermal expansion value of 18 ppm K −1 , and glass transition temperature of 394°C. Furthermore, the optical properties of these copolymers were well balanced due to the adoption of CBDA, which can suppress the formation of charge transfer complexes. Specifically, these CPI films displayed transmittance at 550 nm of >88%, b * values of <5.5, haze values of <1%. The aforementioned results revealed that copolymerization is an effective strategy to achieve CPIs with excellent comprehensive properties.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12302-12307
·
IF 7.059
Xuyuan Bao,Mingze Li,Jing Zhao,Zhiguo Xia
CsPbI3 perovskite nanocrystals (NCs) are generally unstable, with low photoluminescence quantum yield (PLQY) and show deep red emission not suitable for optoelectronic applications. Herein, we propose a facile postsynthetic anion exchange method to enhance PLQY and stability via the controlled addition of ZnBr2 solution, in which the emission peak is adjusted from 690 nm to 550 nm and the PLQY was enhanced from about 50% to near unity (98%). We further unveiled the ion exchange kinetics of the rapid transitions between two phases (CsPbI3 and CsPbBrI2) within 40 minutes, and also demonstrated that the electron trap and hole trap transformed mutually with the increase of halogen enabling the variable PLQYs. Moreover, the as-prepared CsPbBrI2 NCs exhibit enhanced stability under UV irradiation and in water compared with that of pristine CsPbI3 NCs. The good stability and highly efficient narrow-band emission centered at 630 nm for CsPbBrI2 NCs show its potential application-possibility in liquid-crystal display backlight. It is suggested that the postsynthetic ZnBr2 halogen ion exchange method demonstrated here opens a new door for the synthesis of high-performance halide perovskite nanocrystals and the development of illumination and display applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Xiankan Zeng,Qiming Yin,Lunyao Pan,Yongjian Chen,Chenglong Li,Maolin Mu,Qungui Wang,Wen Li,Weiqing Yang
CsCu2I3 light-emitting diodes (LEDs) have attracted tremendous interest due to their environmental friendliness, low-cost processing, and broadband luminescence properties. However, their hole injection efficiency usually towers over electron injection efficiency owing to the intrinsic Cu vacancy-mediated excess hole concentration and wide bandgap of CsCu2I3, generating severe charge imbalance. Here, we designed an inorganic interfacial dipole layer (IDL) based on lithium chloride to exert a hole delayed-release effect for charge balance in CsCu2I3 LEDs by selectively modulating the energy levels of the contact layers. Accordingly, the IDL-based CsCu2I3 LEDs exhibit a record champion brightness of 2620 cd/m2 along with a three times enhanced peak external quantum efficiency of 3.73% at 565 nm. Meanwhile, the universality of the hole delayed-release effect of inorganic IDLs is verified by demonstrating enhanced CsCu2I3 LEDs incorporated with other alkali metal salt-based IDLs. This work provides a comprehensive guideline for optimizing the charge transport of lead-free LEDs by charge delayed-release effect of IDLs toward next-generation eco-friendly display applications.
研究领域:
材料科学
·
光电技术
·
能源与环境
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Chun Sun,Zhiyuan Gao,Hanxin Liu,Le Wang,Yuchen Deng,Peng Li,Huanrong Li,Zi-Hui Zhang,Chao Fan,Wengang Bi
Blue-emitting perovskite nanocrystals (NCs) are known to exhibit low photoluminescence (PL) quantum yield (QY) compared to green- and red-emitting counterparts, which is due to the presence of localized trap states on the surface. Here, we demonstrate a new method to synthesize high-efficiency blue-emitting perovskite NCs by anion exchange of 0D and 3D perovskite NCs. The remarkable enhancement of the PL QY is caused by surface reconstruction and subsequent suppression of nonradiative recombination centers of 3D perovskite NCs during the anion exchange. Remarkably, these high-efficiency NCs have two appealing applications. First, they can be applied in backlight display, where the GaN light-emitting diode is usually used as the blue emission source. We found that the as-prepared NCs were facile to tune their emission peaks and possessed narrow linewidths. As a downconverter, the NCs realize an ultrapure blue light for backlight display. Second, benefiting from the existence of 0D perovskite, anticounterfeiting inks can also be achieved based on these blue-emitting perovskite NCs. The encoding/reading strategy relies on the conversion of 0D perovskites. These findings provide new opportunities for blue-emitting perovskite NCs and broaden their application.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2002130
·
IF 9.926
Qinggang Zhang,Weilin Zheng,Qun Wan,Mingming Liu,Xiuping Feng,Long Kong,Liang Li
For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr 3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr 3 /MS@SiO 2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yuanjie Wang,Tengfei Cao,Zhihuang Xu,Liwang Ye,yingui Gao,Xinxin Zhuang
Mn 2+ -based halides show great promise for solid-state lighting and display applications owing to their structural flexibility and excellent luminescence properties. Herein, three hybrid manganese halides (N-AEP)[MnBr 3 (H 2 O) 3 ] 2 ·Br ( 1 ), [(N-AEP) 2 MnBr 6 ]·2Br ( 2 ) and [(N-AEP) 2 MnBr 4 ]·3Br(H 2 O) ( 3 ) with the same organic ligand have been successfully synthesized by adjusting various HBr level or temperature of growth solutions. Systematic characterizations of halides including crystal structure, thermal and photophysical properties were carried out. Their distinct inorganic groups lead to the various luminescence colors: purple-red light in 1 , orange-red light in 2 and green light in 3 . Some interesting physicochemical features, for 1 the temperature-dependent emission properties, 2 the satisfactory thermostability with higher PLQY (13.36%), and 3 the weak ferromagnetic coupling effect, broaden their application prospects. This paper offers sufficient synthetic experiences for Mn 2+ -based halides with different inorganic groups in detail, and provides a reasonable research scheme for their optical properties .
研究领域:
材料科学
·
化学
·
光电
·
固态照明
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）