OPTICAL MATERIALS
·
2022
·
IF 3.754
Chenfei Wang,Canyun Zhang,Fengchao Wang,Jin Chen,Enliang Ren,Jinfang Kong,Lan Li,Jiayue Xu,Yan Zhang
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted enormous attention owing to their excellent optical properties such as ultrahigh photoluminescence quantum yield (PLQY), narrow full width at half maximum (FWHM) and broad emission spectra tunability. In this study, we reported the synthesis of colloidal perovskite NCs based on CsPbBr 3 @Cs 4 PbBr 6 composite structure. With the assistance of Tetraoctylammonium bromide (TOAB) ligands, the prepared CsPbBr 3 @Cs 4 PbBr 6 NCs show high PLQY of 94.7% and enhanced stability. The crystal morphology and phase structure of the CsPbBr 3 @Cs 4 PbBr 6 NCs were investigated by HRTEM and XRD measurements. In addition, the crystal morphology of CsPbBr 3 @Cs 4 PbBr 6 NCs presents cubic and circular particles with an average size of 9.3 nm. Compared with CsPbBr 3 NCs, the diphase CsPbBr 3 @Cs 4 PbBr 6 composite materials can perform higher optical properties due to the in-situ passivation of the generated Cs 4 PbBr 6 NCs. Furthermore, the fabricated LED device exhibits bright white light emission with a color coordinate of (0.335, 0.337), the corresponding color temperature of 5390 K and a color rendering index of 82.1 under the injection current of 30 mA. These results demonstrate that the obtained CsPbBr 3 @Cs 4 PbBr 6 NCs have a potential application in white light-emitting and display devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
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 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
Coatings
·
2022
·Vol. 12
·期 4
·512
·
IF 3.236
Song Wang,Yan Xu,Renjie Chen,Mengmeng Zhu,Muyi Wang,Mengmeng Cao,Yunpeng Liu,Haojie Ding,Shulan Zhang,Jueyao Bai,Jun Ren,Tongtong Xuan,Huili Li
All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 6
·期 12
·2100654
·
IF 7.848
Ze Wang,Yaqian Zhang,Xiaodong Liu,Yanxia Yu,Fucai Xu,Jing Ding,Xiaojuan Liang,Keqin Yang,Weidong Xiang
In this study, a simple low-temperature self-assembly strategy is used to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepared CsPbBr 3 /Cs 4 PbBr 6 nanocomposite exhibits the reversible luminescence phenomenon by simply applying the wetting and drying process. This abnormal phenomenon is due to the internal phase transformation of the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite. The potential application of the nanocomposite in anti-counterfeiting has been demonstrated. This work facilitates the production and application of inorganic metal halide perovskite-based functional materials.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 25
·45376-45392
·
IF 3.833
Longshi Rao,Longshi Rao,Bin Sun,Bin Sun,Qing Zhang,Qing Zhang,Mingfu Wen,Mingfu Wen,Jiayang Zhang,Jiayang Zhang,Guisheng Zhong,Guisheng Zhong,Guisheng Zhong,Ting Fu,Xiaodong Niu,Xiaodong Niu,Yong Tang
Benefit from their near-unity photoluminescence quantum yield (PL QY), narrow emission band, and widely tunable bandgap, metal halide perovskites have shown promising in light-emitting applications. Despite such promise, how to facile, environmentally-friendly, and large-scale prepare solid metal halide perovskite with high emission and stability remains a challenging. Herein, we demonstrate a convenient and environmentally-friendly method for the mass synthesis of solid CsPbBr3/Cs4PbBr6 composites using high-power ultrasonication. Adjusting key experimental parameters, bright emitting CsPbBr3/Cs4PbBr6 solids with a maximum PL QY of 71% were obtained within 30 min. XRD, SEM, TEM, Abs/PL, XPS, and lifetime characterizations provide solid evidence for forming CsPbBr3/Cs4PbBr6 composites. Taking advantage of these composites, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6 are much improved compared to CsPbBr3. We further demonstrated CsPbBr3/Cs4PbBr6 use in flexible/stretchable film and high-power WLEDs. After being subjected to bending, folding, and twisting, the film retains its bright emission and exhibits good resistance to mechanical deformation. Additionally, our WLEDs display a superior, durable high-power-driving capability, operating currents up to 300 mA and maintaining high luminous intensity for 50 hours. Such highly emissive and stable metal halide perovskites make them promising for solid-state lighting, lasing, and flexible/stretchable display device applications.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chenxu Wang,Lihe Yan,Jinhai Si,Tianyu Huo,Xun Hou
All-inorganic lead halide perovskites nanocrystals (NCs) have been demonstrated to be promising candidates for optoelectronic devices, but preparing perovskite NCs with high photoluminescence quantum yields (PLQYs) and excellent stability has been a challenge. In this work, CsPbBr 3 /Cs 4 PbBr 6 core/shell NCs with a PLQYs of 87.23% and long-term stability in ambient environments was prepared by room temperature inverse microemulsion method. The excellent stability of the sample was attributed to the protection of Cs 4 PbBr 6 , and higher PLQYs could be owing to the passivation effect of the core/shell structure. To illustrate the distribution of photogenerated carrier in the core/shell structure, a confined excitons model was proposed based on time-resolved PL and temperature dependent PL measurements. Femtosecond time-resolved transient absorption spectra measurements were performed upon different excitation wavelength to unveil the photogenerated carrier dynamics in core/shell NCs. Upon 300 nm excitation, a carrier transfer process with the time of 3.18 ps from shell to core layer was observed. Furthermore, both two- and three-photon absorption PL was discovered in core/shell NCs, further verifying the carrier transfer process.
研究领域:
材料科学
·
光电
·
纳米技术
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Jinlei Zhang,Cihui Liu,Shuyi Wu,Yunsong Di,Fangjian Xing,Zhiyuan Ren,Xiao Zhang,Lun Yang,Chunlan Ma,Zhixing Gan
Deep insight into the ultrafast charge carrier dynamics is fundamentally significant for the development of high-performance optoelectronic devices. The CsPbBr3/Cs4PbBr6 nanocomposite, as an important member of the perovskite family, has attracted extensive research interest. However, the underlying ultrafast carrier dynamics is still elusive. Herein, an endeavor has been made to investigate the impact of Cs4PbBr6 encapsulation on the ultrafast carrier dynamics of CsPbBr3 nanoinclusions. The hot-carrier cooling time is about 190–302 fs, relying on the pump fluence, which is relatively shorter than that of pure CsPbBr3. Thus, the encapsulation of Cs4PbBr6 shortens the hot-carrier cooling time, which is attributed to the participation of longitudinal optical (LO) phonons from Cs4PbBr6 and dissipation of the energy via coupling to surface encapsulation. The biexciton binding energy is estimated to be 69 meV, with a biexciton lifetime of 40 ps. The biexciton binding energy is a relatively high value compared to those of CsPbBr3 nanostructures with similar biexciton lifetimes, which is mainly due to the smaller sizes of the CsPbBr3 inclusions in the composites.
研究领域:
光电子学
·
材料科学
·
纳米技术
·
光物理
·
钙钛矿半导体
✓ 已验证
DOI
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
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 16
·5670-5678
·
IF 4.099
Xiao Chen,Daqin Chen,Junni Li,Gaoliang Fang,Hongchao Sheng,Jiasong Zhong
As a novel type of promising materials, metal halide perovskites are a rising star in the field of optoelectronics. On this basis, a new frontier of zero-dimensional perovskite-related Cs4PbBr6 with bright green emission and high stability has attracted an enormous amount of attention, even though its photoluminescence still requires to clarification. Herein, the controllable phase transformation between three-dimensional CsPbBr3 and zero-dimensional Cs4PbBr6 is easily achieved in a facile ligand-assisted supersaturated recrystallization synthesis procedure via tuning the amount of surfactants, and their unique optical properties are investigated and compared in detail. Both Cs4PbBr6 and CsPbBr3 produce remarkably intense green luminescence with quantum yields up to 45% and 80%, respectively; however, significantly different emitting behaviors are observed. The fluorescence lifetime of Cs4PbBr6 is much longer than that of CsPbBr3, and photo-blinking is easily detected in the Cs4PbBr6 product, proving that the zero-dimensional Cs4PbBr6 is indeed a highly luminescent perovskite-related material. Additionally, for the first time, tunable emissions over the visible-light spectral region are demonstrated to be achievable via halogen composition modulations in the Cs4PbX6 (X = Cl, Br, I) samples. Our study brings a simple method for the phase control of CsPbBr3/Cs4PbBr6 and demonstrates the intrinsic luminescence nature of the zero-dimensional perovskite-related Cs4PbX6 products.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）