CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Pengfei Ma,Yixin Hou,Yifan Zheng,Jun Su,Luying Li,Nishuang Liu,Zhi Zhang,Yanan Ma,Yihua Gao
All-inorganic perovskite quantum dots (QDs) are very promising materials for their potential applications in water-related photoluminescence due to their sensitive properties to water. This work initiatively attempts to absorb Cs 4 PbBr 6 QDs into a super-hydrophobic polydivinylbenzene (PDB) porous framework. Under the protection of PDB, the non-luminescent Cs 4 PbBr 6 and luminescent CsPbBr 3 transform reversibly by alternate water treatment (excess or small amount) and removal of water. The extraction of CsBr by water and reinsertion of CsBr by evaporation from/into the QDs make up a reversible phase transformation process. The super-hydrophobic porous structure of PDB not only provides the confined space for dissolved CsBr but also inhibits the overflow of trapped CsBr, thereby reducing the adverse impact of excess water on reversible hydrochromism. This work provided a new perspective to understand the phase conversion between Cs 4 PbBr 6 and CsPbBr 3 . Furthermore, the Cs 4 PbBr 6 @PDB in waterborne luminescent inks by screen printing opens a way in the field of anti-counterfeiting owing to the excellent stability of encryption and decryption.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 35
·21738-21744
·
IF 3.361
Zikuan Shi,Yu Yang,Xin-Yuan Sun,Feng Lang,Yu Xiang,Liangwu Lin
We developed a new ligand and adjuvant dual-assisted room temperature colloidal method for the synthesis of highly luminescent and stable Cs4PbBr6 nanoparticles, in which acetone, oleamine (OM) and oleic acid (OA) were used as precursors, while water and dimethyl sulfoxide (DMSO) were used as adjuvants. In this process, we explored the influencing factors of process parameters (such as the amount of water, the standing time of precursors, and the molar ratio of raw materials), and found that Cs4PbBr6 synthesized by water + DMSO can not only change the morphology and promote crystallization but also improve the lattice strain, reduce the lattice defects and optimize the passivation effect, so as to improve the luminescence properties. Simultaneously, we also found that the pc-LED made of Cs4PbBr6 can still emit bright green light after 4344 h of operation, showing excellent stability and making it promising for solid-state lighting application. This method also provides an important reference value for solving the hydrolysis property of perovskites.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Ding,Yufeng Zhou,Ziyao He,Qingyun He,Xiaojuan Liang,Wei Xia,Weidong Xiang
All-inorganic perovskites have been considered next-generation color converters in the backlit due to their shining optical properties. However, structural instability severely limits their pragmatic applications. Here, CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) were successfully embedded in polydimethylsiloxane (PDMS) films by a facile two-step method. As-prepared PDMS films containing CsPbBr 3 /Cs 4 PbBr 6 MCs (CsPbBr 3 /Cs 4 PbBr 6 @PDMS) obtain high brightness and excellent stability. Meaningfully, the PDMS films not only serve as a double protective matrix that can be used to improve the stability of CsPbBr 3 /Cs 4 PbBr 6 MCs, but also a flexible substrate with high transparency that allows the CsPbBr 3 /Cs 4 PbBr 6 @PDMS films to be used as color conversion materials for backlit displays. To our surprise, when PDMS is coated with CsPbBr 3 /Cs 4 PbBr 6 MCs, the water, thermal and photostability are greatly improved, while the photoluminescence intensity only lost by 10%. Furthermore, by mixing CsPbBr 3 /Cs 4 PbBr 6 MCs with K 2 SiF 6 :Mn 4+ phosphors in PDMS, a monolithic film with high performance was obtained. Its color gamut can reach 127% of the NTSC 1953 standard and 95% of the REC. 2020 standard, exhibiting the bright prospects in the backlit display field.
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
ACS Applied Nano Materials
·
2022
·
IF 6.14
Ying Li,Rong Song,Jiaming Liu,Jun Qian,Xin Wang
Inorganic perovskites show excellent advantages over traditional quantum dots (QDs) and have great potential for application in light-emitting devices, display devices, and other fields. In this paper, CsPbBr3/Cs4PbBr6 QDs with different cesium-to-lead ratios are synthesized in one step at room temperature and in a simple environment without protective measures. Among them, the perovskite powder with a photoluminescence quantum yield (PLQY) of 54% and a series of ink additives are formulated into a perovskite fluorescent ink with high stability and printability. The inks are used not only for printing but also for writing with simple and convenient application conditions in mass production. Finally, the inks are used to combine ZnS:Cu flexible alternative current electroluminescent (ACEL) devices to produce two different structures of light conversion flexible ACEL devices in a full-printing manner. The material loss and cost of the devices are very low. Pattern drawing and printing can be performed selectively. Among them, the P-outside structure ACEL device has a high lumen efficiency of 77.43 lm/W, which shows the application potential of the ink in ACEL devices and promotes the process of perovskite materials from laboratory to industrial applications.
研究领域:
材料科学
·
光电设备
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 7
·1-13
·
IF 2.02
Yang Liu,Li Dongmei,Wang Cong,Yao Wei,Wang Hao,Huang Kaixiang
Currently, all-inorganic cesium lead-halide perovskite nanocrystals have attracted enormous attentions owing to their excellent optical performances. While great efforts have been devoted to CsPbBr 3 nanocrystals, the perovskite-related Cs 4 PbBr 6 nanocrystals, which were newly reported, still remained poorly understood. Here, we reported a novel room-temperature reaction strategy to synthesize pure perovskite-related Cs 4 PbBr 6 nanocrystals. Size of the products could be adjusted through altering the amount of ligands, simply. A mixture of two good solvents with different polarity was innovatively used as precursor solvent, being one key to the high-yield Cs 4 PbBr 6 nanocrystals synthesis. Other two keys were Cs + precursor concentration and surface ligands. Ingenious experiments were designed to reveal the underlying reaction mechanism. No excitonic emission was observed from the prepared Cs 4 PbBr 6 nanocrystals in our work. We considered the green emission which was observed in other reports originated from the avoidless transformation of Cs 4 PbBr 6 into CsPbBr 3 nanocrystals. Indeed, the new-prepared Cs 4 PbBr 6 nanocrystals could transform into CsPbBr 3 nanosheets with surface ligands mediated. The new-transformed two-dimensional CsPbBr 3 nanosheets could evolve into large-size nanosheets. The influences of surface ligand density on the fluorescent intensity and stability of transformed CsPbBr 3 nanosheets were also explained. Notably, the photoluminescence quantum yield of the as-transformed CsPbBr 3 nanosheets could reach as high as 61.6% in the form of thin film. The fast large-scale synthesis of Cs 4 PbBr 6 nanocrystals and their ligand-mediated transformation into high-fluorescent CsPbBr 3 nanosheets will be beneficial to the future optoelectronic applications. Our work provides new approaches to understand the structural evolution and light-emitting principle of perovskite nanocrystals.
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研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yufeng Zhou,Jing Ding,Ze Wang,Yao Tong,Xiaojuan Liang,Juan Du,Wei Xia,Zhengzheng Liu,Weidong Xiang
In recent years, perovskite nanocrystals (NCs) have been considered novel and potentially valuable optical gain materials that can generate relatively low thresholds and stable stimulated emissions in various external environments. Here, for the first time, an ethylene vinyl acetate copolymer (EVA) film-protected metal halide perovskite (Cs 4 PbBr 6 ) solid powder was successfully synthesized, and its photoluminescence quantum yield (PLQY) value was as high as 61%. In addition, because the Cs 4 PbBr 6 @EVA composite film has excellent optical gain performance, this work explored the optical gain of the Cs 4 PbBr 6 @EVA composite film under 800 nm femtosecond (fs) laser excitation. The experimental results show that the Cs 4 PbBr 6 @EVA composite film has a low threshold (0.89 mJ/cm 2 ) and stable stimulated emission and generates amplified spontaneous emissions (ASEs) at 544 nm. In addition, the application of Cs 4 PbBr 6 @EVA composite film in the field of white light-emitting diodes (WLEDs) has also been studied. The color gamut of this Cs 4 PbBr 6 @EVA composite film is as high as 124.7% of the National Television Standards Committee (NTSC) 1953 standard color gamut and covers 92.8% of the Rec. 2020 standard color gamut. This work proposes a simple method to solve the problem of the poor stability of perovskite solid powder, and the prepared Cs 4 PbBr 6 @EVA composite film shows significant promise in WLED and laser applications.
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
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 9
·5374-5383
·
IF 4.682
Qin Wenjing,Zheng Kai,Liu Hengchao,Chu Jingting
The CsPbBr 3 /Cs 4 PbBr 6 perovskite composite material has received wide attention due to its good stability and photoelectric properties, and it is promising to appear in various photoelectric applications. However, there are still some challenges in how to control the synthesis of this material and obtain the balance between high fluorescence efficiency and well stability. In this study, we proposed a rapid anti-solvent vapor-assisted method to prepare CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) with hexagonal tower structure. It is found that oleic acid and oleamine can effectively control the morphology, grain size and optical properties of the material. This unique hexagonal tower structure CsPbBr 3 /Cs 4 PbBr 6 MCs has excellent optical properties, showing strong green emission at 514 nm and PLQY of 78.4 ± 4.3%, with a narrow full width at half maximum value of 20 nm. In addition, environmental stability experiments have shown that after 6 months of storage under 50% relative humidity, the PL strength loss is lower than 20%. Graphical Abstract
研究领域:
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·355
·
IF 5.3
Longshi Rao,Bin Sun,Yang Liu,Guisheng Zhong,Mingfu Wen,Jiayang Zhang,Ting Fu,Shuangxi Wang,Fengtao Wang,Xiaodong Niu
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr3/Cs4PbBr6composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr3/Cs4PbBr6composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs4PbBr6matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6-LP are significantly improved compared to CsPbBr3quantum dots and CsPbBr3/Cs4PbBr6composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr3/Cs4PbBr6-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr3/Cs4PbBr6-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC.Keywords:ultrasonication;liquid paraffin;CsPbBr3/Cs4PbBr6;white-light-emitting diodes;visible light communication
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan Chen,Ying Liu,Junhao Li,Chunli Zhao,Yougui Yang,Ling He,Meng Wu,Qi Wang,Yong Yang,Chunjian Wang,Dacheng Zhou,Jianbei Qiu
Hydrochromic materials have received much attention in anticounterfeiting due to their reversible photoemission properties toward water. However, existing hydrochromic materials usually suffer from slow hydrochromic response and limited stability, repeatability, and color tunability. This paper found for the first time that CsPbBr 3 /Cs 4 PbBr 6 composites with quantum-limited domain effects had reversible hydrochromism. CsPbBr 3 /Cs 4 PbBr 6 composites were successfully synthesized in molecular sieve MCM-41 using an improved mechanochemical method. The composites underwent a reversible phase transition from Cs 4 PbBr 6 /CsPbBr 3 to CsPbBr 3 upon treatment with a trace amount of water, the photoluminescence colors underwent a change from blue to green, and reversion occurred due to heating. Mechanistic investigation revealed that quantum dots underwent soft agglomeration due to van der Waals forces in polar solvent environments, affecting the action of quantum domain-limiting effects. Therefore, organic solvents with different polarities can cause different degrees of reversible discoloration of the material. This study provides new ideas for understanding the phase transition and agglomeration of metal halide perovskite quantum dots in polar solvent environments. Additionally, it offered new options for aqueous color-changing materials and organic solvent polar detection materials.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·69
·
IF 2.533
Song Rong,Li Ying,Qian Jun
Perovskite has shown attractive optoelectronic performances and is a potential material in lighting, anti-counterfeiting, sensor, and other optoelectronic devices. Recently, spin-coating has been widely used in fabricating high-performance perovskite films, but it is difficult to process and apply in practice. In this paper, the CsPbBr 3 /Cs 4 PbBr 6 composite perovskite quantum dots with photoluminescence quantum yield of 36% and high storage stability were prepared by using room temperature ligand-assisted precipitation method and controlling the proportion of CsBr/PbBr 2 . In addition, the composite perovskite was ground and dispersed in the inks system. After adjusting the composition and ratio of the resin components, the inks were suitable for screen printing with a viscosity of 2439 mPa•s, an initial dryness of 25 mm/30 s, and a thorough dryness of 100 s/100 μm. By printing, the perovskite films exhibited high coverage, strong green emission, and outstanding fluorescence recovery ability after exposure to water. Screen printing perovskite inks have the characteristic of being patternable, which provides a solution for preparing a perovskite film in the application.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
印刷电子
·
荧光材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 72
·42430-42437
·
IF 3.049
Shangxuan Huang,Sen Yang,Qi Wang,Ruirui Wu,Qiuju Han,Wenzhi Wu
Cs4PbBr6/CsPbBr3 perovskite composites are fabricated by room-temperature one-pot mixing synthesis, which is short in time, free from inert gases and delivers a high product yield. Temperature-dependent photoluminescence shows that a larger exciton binding energy of 291.1 meV exhibits better thermal stability compared with that of pure Cs4PbBr6 and CsPbBr3 materials. The CIE chromaticity coordinates (0.1380, 0.7236) of green LEDs designed with Cs4PbBr6/CsPbBr3 perovskite composites show almost no variation under driving current changing from 5 to 30 mA. Furthermore, the ground Cs4PbBr6/CsPbBr3 perovskite composites mixed with red emitting K2SiF6:Mn4+ phosphor are dropped and casted on a blue-emitting InGaN chip. The white light emitting diodes (WLEDs) are presented, which have good luminous efficiency of 65.33 lm W−1 at 20 mA, a correlated color temperature of 5190 K, and the white gamut with chromaticity coordinate of (0.3392, 0.3336). According to the state of art, these excellent characteristics observed are much superior to the reported results of conventional perovskite-based WLEDs, which demonstrate the immense potential and great prospect of Cs4PbBr6/CsPbBr3 perovskite composites to replace conventional phosphors in lighting devices.
研究领域:
材料科学
·
光学工程
·
半导体技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APL Materials
·
2020
·Vol. 8
·期 7
·
IF 3.819
Jiang Jintian,Wang Daoyuan,Wu Mingfang,Peng Ping,Li Fang-Fang,Liu Faqian,Jing Renwei,Ma Xuedan,Chao Yan,Xiao Zhili,Jiang Qinglong
Cs 4 PbBr 6 crystals have been synthesized by an ultrasonication-assisted trace amount polar solvent method. The prepared green Cs 4 PbBr 6 material was found to have high photoluminescence (PL) brightness and 10 ns PL lifetime. The prepared green light emitting device can achieve the maximum brightness of 3.8 × 10 9 cd/m 2 , which is nearly 100 times higher than a wick. The white light emitting device based on Cs 4 PbBr 6 crystals has better performance than commercial products, which can cover 32.3% of the color gamut and achieves 107.3% coverage for International Commission on Illumination (CIE)1931 and 84.8% coverage for CIE1976.
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
危险品化学品经营许可证（带存储）