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Xie C, Zhang X, Chen HS, Yang P. Highly Bright and Stable CsPbX 3@Cs 4PbX 6 Hexagonal Nanoarchitectonics Created by Controlling Dissolution-Recrystallization of CsPbX 3 Nanomaterials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2403648. [PMID: 38881372 DOI: 10.1002/smll.202403648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/09/2024] [Indexed: 06/18/2024]
Abstract
CsPbBr3@Cs4PbBr6 hexagonal NCs with a bright photoluminescence (PL) peak of 456 nm are created through the dissolution-recrystallization of CsPbBr3 nanoplatelets. Small CsPbBr3 nanocrystals are encapsulated in hexagonal Cs4PbBr6 during recrystallization to form a core-shell structure and keep high brightness and stability. The recrystallization kinetics is systematically investigated to explore the roles of methyl acetate, oleylamine, and n-hexane. Result further indicates that core/shell NCs remained high PL under a variety of harsh conditions (e.g., light irradiation and heat treatment) because of Cs4PbX6 shell and the controlling of recrystallization. Their initial PL intensity is remained after 4 months of storage under ambient conditions and continuous exposure to UV lamp for 180 min. The bright PL is also maintained even treatment at 120 °C. To indicate the universality of this synthesis method, CsPbX3@Cs4PbX6 hexagonal NCs with different emission colors are fabricated by changing temperature, solvent viscosity, and precursors (e,g, oleylamine and halogens). These core-shell samples reveal bright and stable green, orange, and red PL. Because of its high stability, the core/shell NCs are dispersed in flexible films to create diverse patterns. The films also exhibit high brightness and excellent stability. This strategy opens a novel avenue for the application of perovskite nanomaterials in the display field.
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Affiliation(s)
- Cong Xie
- School of Material Science & Engineering, University of Jinan, Jinan, 250022, P. R. China
| | - Xiao Zhang
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24 St, Krakow, 31-155, Poland
| | - Hsueh Shih Chen
- Department of Materials Science & Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Ping Yang
- School of Material Science & Engineering, University of Jinan, Jinan, 250022, P. R. China
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2
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Xu Q, Zhang T, Liu M, Wang M, Cao K, Chen R. CsBr-Triggered Reversible Phase Transition of Perovskite Nanocrystals for Advanced Information Encryption and Decryption. ACS APPLIED MATERIALS & INTERFACES 2024; 16:17051-17061. [PMID: 38511856 DOI: 10.1021/acsami.4c01996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
Luminescent perovskite nanocrystals (NCs), possessing the advantages of low cost, easy detection, and excellent luminescence, are becoming more and more significant in the fields of information encryption and decryption. Most hydrochromic perovskite NCs for information encryption have moderate reversibility and are easily passively decrypted by water in the moist air, limiting their practical applications. Herein, a lyochromic material is synthesized based on reversible phase transition between luminescent CsPbBr3-HBr (pretreating CsPbBr3 with HBr) and nonluminescent Cs4PbBr6, exhibiting excellent reversibility in 50 cycles triggered by CsBr solution. HBr treatment boosts the ion migration of NCs via diminishing surface ligands and passivating Br vacancy, assisting CsBr concentration acting as a crucial factor in dynamic ion exchange equilibrium between the trigger solution and CsPbBr3-HBr. By utilizing CsPbBr3-HBr as a safety ink, the CsBr-triggered photoluminescence switch has been demonstrated to be reproducible, stable, and reliable for information encryption and decryption.
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Affiliation(s)
- Qing Xu
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Tianwei Zhang
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Mengjia Liu
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Min Wang
- State Key Laboratory of Material Processing and Die & Mould Technology and School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Kun Cao
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Rong Chen
- State Key Laboratory of Intelligent Manufacturing Equipment and Technology and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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3
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Qiao Z, Wang X, Zhai Y, Yu R, Fang Z, Chen G. In Situ Real-Time Observation of Formation and Self-Assembly of Perovskite Nanocrystals at High Temperature. NANO LETTERS 2023. [PMID: 37982537 DOI: 10.1021/acs.nanolett.3c02908] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
All-inorganic cesium lead halide perovskite nanocrystals (NCs) have received much attention due to their outstanding optical and electronic properties, but the underlying growth mechanism remains elusive due to their rapid formation process. Here, we report an in situ real-time study of the growth of Cs4PbBr6 NCs under practical synthesis conditions in a custom-made reactor. Through the synchrotron-based small-angle X-ray scattering technique, we find that the formation of Cs4PbBr6 NCs is accomplished in three steps: the fast nucleation process accompanied by self-focusing growth, the subsequent diffusion-limited Ostwald ripening, and the self-assembly of NCs into the face-centered cubic (fcc) superlattices at high temperature and the termination of growth. The simultaneously collected wide-angle X-ray scattering signals further corroborate the three-step growth model. The influence of superlattice formation is also elucidated, which improves the uniformity of the final NCs.
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Affiliation(s)
- Zhi Qiao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Xiao Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yufeng Zhai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Runze Yu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Zhu Fang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Gang Chen
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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4
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El-Newehy M, El-Hamshary H, Abdul Hameed MM. Dual-mode security authentication of SrAl 2 O 4 :Eu,Dy phosphor encapsulated in electrospun cellulose acetate nanofibrous films. LUMINESCENCE 2023; 38:1758-1767. [PMID: 37465842 DOI: 10.1002/bio.4562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 07/03/2023] [Accepted: 07/14/2023] [Indexed: 07/20/2023]
Abstract
Photochromic inks have been an attractive authentication strategy to improve the anti-counterfeiting efficiency of commercial products. However, recent reports have shown significant disadvantages with photochromic inks, including poor durability and high cost. In this context, we developed novel photochromic nanofibres for advanced anti-counterfeiting applications. Lanthanide-doped strontium aluminate (LdSA) nanoparticles (NPs) were prepared and immobilized into electrospun cellulose acetate nanofibres (CANF). Authentication materials immobilized with inorganic photochromic agents can warranty durability and photostability. Therefore, the ultraviolet-stimulated photochromism of LdSA-encapsulated cellulose acetate nanofibres (LdSA@CANF) demonstrated high reversibility and photostability. A broad range of cellulose acetate nanofibres with unique emission characteristics was developed when applying different ratios of LdSA NPs. LdSA@CANF appeared colourless under visible daylight, whereas a green emission was monitored under ultraviolet-light illumination. The shape and chemical content of the photochromic fibrous films were examined using various analytical techniques. The mechanical characteristics of LdSA@CANF-coated paper were investigated. The emission wavelength was detected at 514 nm to designate green colour, whereas the excitation wavelength was detected at 369 nm to indicate transparency. The prepared cellulose acetate nanofibrous film can be described as an efficient strategy for the anti-counterfeiting of commercialized items.
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Affiliation(s)
- Mohamed El-Newehy
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Hany El-Hamshary
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
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5
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Chen J, Zeng Y, Sun R, Zhang W, Huang Y, Zheng J, Chi Y. Hydrochromic Perovskite System with Reversible Blue-Green Color for Advanced Anti-Counterfeiting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301010. [PMID: 37086127 DOI: 10.1002/smll.202301010] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 03/27/2023] [Indexed: 05/03/2023]
Abstract
The intrinsic instability of halide perovskites toward to external stimulus, has created a competitive advantage for designing stimuli-responsive materials. However, the external environment tuning reversibly fluorescence emission of perovskite system is still limited. In this work, humidity is verified to act as a new option to modulate the emission properties of mixed-halide perovskite. The perovskite nanocrystals (PNCs) photoirradiated in dichloromethane are easily and stably redispersed in water, and emit bright fluorescence which is quite different from the original. Moreover, the perovskites confined on glass slide can reversibly switch their fluorescence between blue and green colors under moisture. It is demonstrated that the factors of different solubilities of CsCl and CsBr in water, the structural transformation of perovskites and the confine of glass matrix play key roles in the reversible transformation. Finally, the combination of hydrochromic CsPb(Brx Cly )3 and water-resistant CsPb(Brx Cly )3 -polymethyl methacrylate have been applied in advanced anti-counterfeiting, which greatly improves the information security. This work not only give an insight into the effects of humidity on fluorescence and structures of PNCs, but also offer a new class of hydrochromic PNCs materials based on reversible emission transformation for potential application in sensors, anti-counterfeiting and information encryption.
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Affiliation(s)
- Jie Chen
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Yiwen Zeng
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Ruifen Sun
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Weiwei Zhang
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Yun Huang
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Jingcheng Zheng
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Yuwu Chi
- MOE Key Laboratory of Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
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6
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Hooper RW, Lin K, Veinot JGC, Michaelis VK. 3D to 0D cesium lead bromide: A 79/81Br NMR, NQR and theoretical investigation. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 352:107472. [PMID: 37186965 DOI: 10.1016/j.jmr.2023.107472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/26/2023] [Accepted: 04/30/2023] [Indexed: 05/17/2023]
Abstract
Inorganic metal halides offer unprecedented tunability through elemental variation of simple three-element compositions, but can exhibit complicated phase behaviour, degradation, and microscopic phenomena (disorder/dynamics) that play an integral role for the bulk-level chemical and physical properties of these materials. Understanding the halogen chemical environment in such materials is crucial to addressing many of the concerns regarding implementing these materials in commercial applications. In this study, a combined solid-state nuclear magnetic resonance, nuclear quadrupole resonance and quantum chemical computation approach is used to interrogate the Br chemical environment in a series of related inorganic lead bromide materials: CsPbBr3, CsPb2Br5, and Cs4PbBr6. The quadrupole coupling constants (CQ) were determined to range from 61 to 114 MHz for 81Br, with CsPbBr3 exhibiting the largest measured CQ and Cs4PbBr6 the smallest. GIPAW DFT was shown to be an excellent pre-screening tool for estimating the EFG of Br materials and can increase experimental efficiency by providing good starting estimates for acquisition. Finally, the combination of theory and experiment to inform the best methods for expanding further to the other quadrupolar halogens is discussed.
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Affiliation(s)
- Riley W Hooper
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Katherine Lin
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Jonathan G C Veinot
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Vladimir K Michaelis
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
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7
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Chen CH, Hsu CH, Ni IC, Lin BH, Wu CI, Kuo CC, Chueh CC. Regulating the phase distribution of quasi-2D perovskites using a three-dimensional cyclic molecule toward improved light-emitting performance. NANOSCALE 2022; 14:17409-17417. [PMID: 36383153 DOI: 10.1039/d2nr04735g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In this study, a molecule with a three-dimensional (3D) cyclic structure, a cryptand, is demonstrated as an effective additive for the quasi-two-dimensional (quasi-2D) PEA2Csn-1PbnBr3n+1 (n = 3, herein) to improve its light-emitting performance. The cryptand can effectively regulate the phase distribution of the quasi-2D perovskite through its intense interaction with PbBr2, benefitting from its cage-like structure that can better capture the Pb2+ ions. Due to the inhibited growth of the low-n phases, a much-concentrated phase distribution is achieved for the cryptand-containing films. Moreover, its constituent O/N atoms can passivate the uncoordinated Pb2+ ions to improve the film quality. Such a synergistic effect thereby facilitates the charge/energy transfer among the multiple phases and reduces the non-radiative recombination. As a result, the quasi-2D perovskite light-emitting diode (PeLED) with the optimized cryptand doping ratio is shown to deliver the highest luminance (Lmax) of 15 532 cd m-2 with a highest external quantum efficiency (EQE) of 4.02%. Compared to the pristine device, Lmax is enhanced by ∼5 times and EQE is enhanced by ∼10 times.
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Affiliation(s)
- Chiung-Han Chen
- Department of Chemical Engineering, National Taiwan, University, Taipei 10617, Taiwan.
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
| | - Chiao-Hsin Hsu
- Institute of Organic and Polymeric Material, National Taipei University of Technology, Taipei 10617, Taiwan.
| | - I-Chih Ni
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Bi-Hsuan Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Chih-I Wu
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Chi-Ching Kuo
- Institute of Organic and Polymeric Material, National Taipei University of Technology, Taipei 10617, Taiwan.
| | - Chu-Chen Chueh
- Department of Chemical Engineering, National Taiwan, University, Taipei 10617, Taiwan.
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
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8
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Yang H, Cai T, Dube L, Chen O. Synthesis of double perovskite and quadruple perovskite nanocrystals through post-synthetic transformation reactions. Chem Sci 2022; 13:4874-4883. [PMID: 35655869 PMCID: PMC9067587 DOI: 10.1039/d2sc00574c] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/25/2022] [Indexed: 11/29/2022] Open
Abstract
Lead-free halide perovskite nanocrystals (NCs) represent a group of emerging materials which hold promise for various optical and optoelectronic applications. Exploring facile synthetic methods for such materials has been of great interest to not only fundamental research but also technological implementations. Herein, we report a fundamentally new method to access lead-free Bi-based double perovskite (DP) and quadruple perovskite (or layered double perovskite, LDP) NCs based on a post-synthetic transformation reaction of Cs3BiX6 (X = Cl, Br) zero-dimensional (0D) perovskite NCs under mild conditions. The produced NCs show good particle uniformity, high crystallinity, and comparable optical properties to the directly synthesized NCs. The relatively slow kinetics and stop-on-demand feature of the transformation reaction allow real-time composition-structure-property investigations of the reaction, thus elucidating a cation-alloyed intermediate-assisted transformation mechanism. Our study presented here demonstrates for the first time that post-synthetic transformation of 0D perovskite NCs can serve as a new route towards the synthesis of high-quality lead-free perovskite NCs, and provides valuable insights into the crystal structures, excitonic properties and their relationships of perovskite NCs.
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Affiliation(s)
- Hanjun Yang
- Department of Chemistry, Brown University 324 Brook St. Providence Rhode Island 02912 USA
| | - Tong Cai
- Department of Chemistry, Brown University 324 Brook St. Providence Rhode Island 02912 USA
| | - Lacie Dube
- Department of Chemistry, Brown University 324 Brook St. Providence Rhode Island 02912 USA
| | - Ou Chen
- Department of Chemistry, Brown University 324 Brook St. Providence Rhode Island 02912 USA
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9
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Chen CH, Kuo YH, Lin YK, Ni IC, Lin BH, Wu CI, Yip HL, Kuo CC, Chueh CC. Enhancing the Performance of Quasi-2D Perovskite Light-Emitting Diodes Using Natural Cyclic Molecules with Distinct Phase Regulation Behaviors. ACS APPLIED MATERIALS & INTERFACES 2022; 14:9587-9596. [PMID: 35142213 DOI: 10.1021/acsami.1c23594] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this study, two natural small molecules, α-cyclodextrin (α-CD) and β-cyclodextrin (β-CD), are used as additives to improve the performance of quasi-2D PEA2Csn-1PbnBr3n+1 (n = 3, herein) PeLEDs. Both of them are shown to efficiently passivate the quasi-2D perovskite films to afford improved film quality and morphology, but they exhibit distinct phase regulation behaviors possibly due to their different pore sizes. It reveals that α-CD effectively suppresses the formation of the low-n phases (n ≤ 2), while β-CD better regulates the phase with a medium-n value (n = 3). Because of effectively suppressing the formation of low-n phases, the CD-assisted quasi-2D perovskite films possess facilitated exciton energy transfer and reduced nonradiative recombination. Consequently, the optimized α-CD-derived PeLED shows the highest luminance (Lmax) of 37,825 cd/m2 with an external quantum efficiency (EQE) of 3.81%, while the β-CD-derived PeLED delivers a lower Lmax of 24,793 cd/m2 with an EQE of 3.09%. Compared to the pristine device, Lmax is enhanced by 6.3 and 3.8 times for α-CD- and β-CD-based PeLEDs, respectively, and EQE is enhanced by ∼4.8 times for both devices; besides, both CD-assisted devices also exhibit improved color purity and a lower bias dependency of electroluminescent intensity.
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Affiliation(s)
- Chiung-Han Chen
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
| | - Yen-Hung Kuo
- Insitute of Organic and Polymeric Material, National Taipei University of Technology, Taipei 10617, Taiwan
| | - Yu-Kuan Lin
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - I-Chih Ni
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Bi-Hsuan Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Chih-I Wu
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
| | - Hin-Lap Yip
- Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077 Hong Kong, P. R. China
| | - Chi-Ching Kuo
- Insitute of Organic and Polymeric Material, National Taipei University of Technology, Taipei 10617, Taiwan
| | - Chu-Chen Chueh
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
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10
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Zhu X, Wang T, Liu Z, Cai Y, Wang C, Lv H, Liu Y, Wang C, Qiu J, Xu X, Ma H, Yu X. A Temporal and Space Anti-counterfeiting Based on the Four-Modal Luminescent Ba2Zr2Si3O12 Phosphors. Inorg Chem 2022; 61:3223-3229. [DOI: 10.1021/acs.inorgchem.1c03712] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaodie Zhu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Ting Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Zhichao Liu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Yiyu Cai
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Chao Wang
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Hongyu Lv
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Ya Liu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Chaochao Wang
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Jianbei Qiu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Xuhui Xu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
| | - Hongqing Ma
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
- Shandong Provincial Key Laboratory of Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China
| | - Xue Yu
- College of Materials Science and Engineering, Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, Yunnan, P.R. China
- School of Mechanical Engineering, Institute for Advanced Materials Deformation and Damage from Multi-Scale, Chengdu University, Chengdu 610000, China
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11
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Bera S, Behera RK, Das Adhikari S, Guria AK, Pradhan N. Equilibriums in Formation of Lead Halide Perovskite Nanocrystals. J Phys Chem Lett 2021; 12:11824-11833. [PMID: 34870990 DOI: 10.1021/acs.jpclett.1c03461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Physical insights related to ion equilibrium involved in the synthesis of lead halide perovskite nanocrystals remain key parameters for regulating the phase stability and luminescence intensity of these emerging materials. These have been extensively studied since the development of these nanocrystals, and different reaction processes controlling the formation of CsPbX3 nanocrystals are largely understood. However, growth kinetics related to the formation of these nanocrystals have not been established yet. Hence, more fundamental understanding of the formation processes of these nanocrystals is urgently required. Keeping these in mind and emphasizing the most widely studied nanocrystals of CsPbBr3, different equilibrium processes involved in their synthesis for phase and composition variations are summarized and discussed in this Perspective. In addition, implementations of these findings for shape modulations by growth are discussed, and several new directions of research for understanding more fundamental insights are also presented.
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Affiliation(s)
- Suman Bera
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Rakesh Kumar Behera
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Samrat Das Adhikari
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Amit K Guria
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Narayan Pradhan
- School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
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12
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Wang Y, Yan Y, Li D, Zhao W, Chen S, Zhong Q, Liu J, Diarra F, Cao M, Zhang Q. Reversible transformation of all-inorganic copper halide perovskite nanocrystals for anti-counterfeiting. Dalton Trans 2021; 50:12826-12830. [PMID: 34499057 DOI: 10.1039/d1dt02386a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This work reports a CsI stripping/insertion process that enables the reversible transformation between blue-emissive Cs3Cu2I5 and yellow-emissive CsCu2I3 upon moisture/evaporation treatment. The successful transformation can be ascribed to the unique space confinement of the SiO2 matrix and ligand-free feature of perovskite nanocrystals, which can be a good candidate for anti-counterfeiting.
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Affiliation(s)
- Yueming Wang
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Yuchen Yan
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Dan Li
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Wenbo Zhao
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Shuhua Chen
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Qixuan Zhong
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Jun Liu
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Fousseyni Diarra
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Muhan Cao
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
| | - Qiao Zhang
- Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China.
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13
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Ahanger FA, Nazir N, Lone MS, Afzal S, Dar AA. Emission Color Tuning and White Light Generation from a Trimolecular Cocktail in Cationic Micellar System with Promising Applicability in the Anticounterfeiting Technology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7730-7740. [PMID: 34128682 DOI: 10.1021/acs.langmuir.1c00785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The development of photoluminescent (PL) systems, displaying multiple stimuli-responsive emission color tuning, has been the pressing priority in the recent times due to their huge role in contemporary lighting and anticounterfeiting technologies. Acknowledging this importance, we present a simple and eco-friendly PL system showing emission color tuning in response to different stimuli, that is, the composition of the system, pH, excitation wavelength, and the temperature with the plus point of getting significantly pure white light emission (WLE). The novel system is fabricated from the aqueous mixture of three organic fluorophores, umbelliferone (UMB), fluorescein (FLU), and Rhodamine-B (RB). By varying the fluorophore composition in the mixture at pH 12, nearly pure WLE with a Commission Internationale d'Eclairage (CIE) 1931 profile of (0.33, 0.33) was obtained at the excitation wavelength of 365 nm, the sustainability of which was ensured by employing the micellar self-assemblies of tetradecyltrimethylammonium bromide (TTAB) molecules. Similar WLE was obtained under mildly acidic conditions (pH 6) but at the excitation wavelength of 330 nm. By proper tuning of pH and the wavelengths of the system to use it as a fluorescent ink, we found a remarkable and highly applicable phenomenon observed for the first time, that is, triple-mode orthogonal emission color tuning with white light ON/OFF switching. We validate the vital applicability of this phenomenon in protecting the authenticity of the document with its hard-to-counterfeit property. The applicability of this phenomenon is also explored by synthesizing PVA-based fluorescent films from the tri-fluorophore mixture. Moreover, the emission color of the PL system was explored lucidly for its temperature dependence owing to the thermal responsiveness of RB emission, where the PL system proves to be a full-color RGB system.
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Affiliation(s)
- Firdaus Ahmad Ahanger
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Nighat Nazir
- Department of Chemistry, Islamia College of Science and Commerce, Hawal, Srinagar 190002, J&K, India
| | - Mohd Sajid Lone
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Saima Afzal
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
| | - Aijaz Ahmad Dar
- Soft Matter Research Group, Physical Chemistry Section, Department of Chemistry, University of Kashmir, Hazratbal, Srinagar 190006, J&K, India
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14
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Si P, Liang M, Sun M, Zhao B. Nature-inspired robust hydrochromic film for dual anticounterfeiting. iScience 2021; 24:102652. [PMID: 34159301 PMCID: PMC8193611 DOI: 10.1016/j.isci.2021.102652] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/26/2021] [Accepted: 05/21/2021] [Indexed: 12/03/2022] Open
Abstract
Nature-inspired materials have been actively developed for anticounterfeiting applications. Among a variety of stimuli-responsive anticounterfeiting strategies, hydrochromic materials exhibit reversible color change in response to moisture or water and have the advantage of being easy to authenticate. However, the security level of current hydrochromic anticounterfeiting materials is not sufficient for practical applications since they only exhibit a single anticounterfeiting function, where the information switches between visible and invisible. To improve the security level and efficiency of hydrochromic anticounterfeiting materials, here we developed a robust dual hydrochromic material via the self-assembly of polyurethane (PU)-polyelectrolytes colloids with which the desired information can not only switch between visible and invisible but also transform from one pattern to another within 3 s without the need of any external instruments. The bio-inspiration, material design and demonstrated hydrochromic properties might have profound implications for using colloidal complexes to make advanced anticounterfeiting materials. Micro-structures are formed by self-assembly of polyurethane-polyelectrolyte colloids Information changes from one pattern to another within 3 s when exposed to water The hydrochromic films are mechanically robust in both dry and wet state
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Affiliation(s)
- Pengxiang Si
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Institute for Polymer Research, University of Waterloo, 200 University Avenue West, N2L 3G1, Canada
| | - Mingrui Liang
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Institute for Polymer Research, University of Waterloo, 200 University Avenue West, N2L 3G1, Canada
| | - Manyou Sun
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Institute for Polymer Research, University of Waterloo, 200 University Avenue West, N2L 3G1, Canada
| | - Boxin Zhao
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Institute for Polymer Research, University of Waterloo, 200 University Avenue West, N2L 3G1, Canada
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15
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Liu Y, Zhang Y. Moving Binary-Color Heterojunction for Spatiotemporal Multilevel Encryption via Directional Swelling and Anion Exchange. ACS NANO 2021; 15:7628-7637. [PMID: 33739830 DOI: 10.1021/acsnano.1c01180] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Naked-eye-visible color/graphical patterns have shown significant potential in optical encryption. However, current strategies for optical encryption are usually based on static or homogeneous information, which limits their applications in multivalue coding and advanced confidential encryption. Here, we propose a concept of spatiotemporally tunable optical encryption by constructing a multilevel binary-color spatial heterojunction pattern into the time dimension. This multiple coding strategy can enable a simple pattern much more difficult to be counterfeited and keep the facile authentication by naked eyes or smartphone at the same time. As a proof of concept, we fabricated a moving red-green heterojunction pattern by elaborately utilizing the directional swelling process of a poly(dimethylsiloxane) matrix in organic solvents and the ion-exchange property of a perovskite quantum dot wrapped in it. We demonstrate that trioctylphosphine plays a significant role in endowing the red-green heterojunction with a stable and distinct interface for better perception by eyes. The directional swelling and following ion-exchange dynamics in the local interface indicate that we can tailor the movement of the binary-color heterojunction in a quasi-continuous way via orthogonal variables of swelling ratio and ion concentration gradient. The concept of heterojunction-based multivalue optical encryption in the time dimension is independent with other dimensions, indicating a promising compatibility with the existing optical encryption systems.
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Affiliation(s)
- Yang Liu
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore 117583
| | - Yong Zhang
- Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore 117583
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456
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16
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Abdollahi A, Roghani-Mamaqani H, Razavi B, Salami-Kalajahi M. Photoluminescent and Chromic Nanomaterials for Anticounterfeiting Technologies: Recent Advances and Future Challenges. ACS NANO 2020; 14:14417-14492. [PMID: 33079535 DOI: 10.1021/acsnano.0c07289] [Citation(s) in RCA: 153] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Counterfeiting and inverse engineering of security and confidential documents, such as banknotes, passports, national cards, certificates, and valuable products, has significantly been increased, which is a major challenge for governments, companies, and customers. From recent global reports published in 2017, the counterfeiting market was evaluated to be $107.26 billion in 2016 and forecasted to reach $206.57 billion by 2021 at a compound annual growth rate of 14.0%. Development of anticounterfeiting and authentication technologies with multilevel securities is a powerful solution to overcome this challenge. Stimuli-chromic (photochromic, hydrochromic, and thermochromic) and photoluminescent (fluorescent and phosphorescent) compounds are the most significant and applicable materials for development of complex anticounterfeiting inks with a high-security level and fast authentication. Highly efficient anticounterfeiting and authentication technologies have been developed to reach high security and efficiency. Applicable materials for anticounterfeiting applications are generally based on photochromic and photoluminescent compounds, for which hydrochromic and thermochromic materials have extensively been used in recent decades. A wide range of materials, such as organic and inorganic metal complexes, polymer nanoparticles, quantum dots, polymer dots, carbon dots, upconverting nanoparticles, and supramolecular structures, could display all of these phenomena depending on their physical and chemical characteristics. The polymeric anticounterfeiting inks have recently received significant attention because of their high stability for printing on confidential documents. In addition, the printing technologies including hand-writing, stamping, inkjet printing, screen printing, and anticounterfeiting labels are discussed for introduction of the most efficient methods for application of different anticounterfeiting inks. This review would help scientists to design and develop the most applicable encryption, authentication, and anticounterfeiting technologies with high security, fast detection, and potential applications in security marking and information encryption on various substrates.
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Affiliation(s)
- Amin Abdollahi
- Faculty of Polymer Engineering, Sahand University of Technology, 51335-1996 Tabriz, Iran
| | - Hossein Roghani-Mamaqani
- Faculty of Polymer Engineering, Sahand University of Technology, 51335-1996 Tabriz, Iran
- Institute of Polymeric Materials, Sahand University of Technology, 51335-1996 Tabriz, Iran
| | - Bahareh Razavi
- Faculty of Polymer Engineering, Sahand University of Technology, 51335-1996 Tabriz, Iran
| | - Mehdi Salami-Kalajahi
- Faculty of Polymer Engineering, Sahand University of Technology, 51335-1996 Tabriz, Iran
- Institute of Polymeric Materials, Sahand University of Technology, 51335-1996 Tabriz, Iran
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17
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Wu T, Xie M, Huang J, Yan Y. Putting Ink into Polyion Micelles: Full-Color Anticounterfeiting with Water/Organic Solvent Dual Resistance. ACS APPLIED MATERIALS & INTERFACES 2020; 12:39578-39585. [PMID: 32805932 DOI: 10.1021/acsami.0c10355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Anticounterfeiting paintings are usually with limited colors and easy blurring and need to be dispersed in an environmentally unfriendly organic solvent. We report a set of water-based polyion micellar inks to solve all these problems. Upon complexation of reversible coordination polymers formed with rare earth metal ions Eu3+ and Tb3+ and the aggregation-induced emission ligand tetraphenylethylene-L2EO4 with oppositely charged block polyelectrolyte P2MVP29-b-PEO205, we are able to generate polyion micelles displaying three elementary emission colors of red (R) (ΦEu3+ = 24%), green (G) (ΦTb3+ = 7%), and blue (B) (ΦTPE = 9%). Full-spectrum emission and white light emission (0.34, 0.34) become possible by simply mixing the R, G, and B micelles at the desired fraction. Strikingly, the micellar inks remain stable even after soaking in water or organic solvents (ethyl acetate, ethanol, etc.) for 24 h. We envision that polyion micelles would open a new paradigm in the field of anticounterfeiting.
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Affiliation(s)
- Tongyue Wu
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Mengqi Xie
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jianbin Huang
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yun Yan
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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18
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Yu X, Wu L, Yang D, Cao M, Fan X, Lin H, Zhong Q, Xu Y, Zhang Q. Hydrochromic CsPbBr
3
Nanocrystals for Anti‐Counterfeiting. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005120] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xiaoya Yu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Linzhong Wu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Di Yang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Muhan Cao
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Xing Fan
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Haiping Lin
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Qixuan Zhong
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Yong Xu
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
| | - Qiao Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices SWC for Synchrotron Radiation Research Soochow University 199 Ren'ai Road Suzhou 215123 Jiangsu P. R. China
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19
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Yu X, Wu L, Yang D, Cao M, Fan X, Lin H, Zhong Q, Xu Y, Zhang Q. Hydrochromic CsPbBr 3 Nanocrystals for Anti-Counterfeiting. Angew Chem Int Ed Engl 2020; 59:14527-14532. [PMID: 32506624 DOI: 10.1002/anie.202005120] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Indexed: 11/09/2022]
Abstract
Hydrochromic materials that can reversibly change color upon water treatment have attracted much attention owing to their potential applications in diverse fields. Herein, for the first time, we report that space-confined CsPbBr3 nanocrystals (NCs) are hydrochromic. When CsPbBr3 NCs are loaded into a porous matrix, reversible transition between luminescent CsPbBr3 and non-luminescent CsPb2 Br5 can be achieved upon the exposure/removal of water. The potential applications of hydrochromic CsPbBr3 NCs in anti-counterfeiting are demonstrated by using CsPbBr3 NCs@mesoporous silica nanospheres (around 100 nm) as the starting material. Owing to the small particle size and negatively charged surface, the as-prepared particles can be laser-jet printed with high precision and high speed. We demonstrate the excellent stability over repeated transformation cycles without color fade. This new discovery may not only deepen the understanding of CsPbX3 , but also open a new way to design CsPbX3 materials for new applications.
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Affiliation(s)
- Xiaoya Yu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Linzhong Wu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Di Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Muhan Cao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Xing Fan
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Haiping Lin
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Qixuan Zhong
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Yong Xu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
| | - Qiao Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, SWC for Synchrotron Radiation Research, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P. R. China
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20
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Yang G, Liu X, Sun Y, Teng C, Wang Y, Zhang S, Zhou H. Improved current efficiency of quasi-2D multi-cation perovskite light-emitting diodes: the effect of Cs and K. NANOSCALE 2020; 12:1571-1579. [PMID: 31859308 DOI: 10.1039/c9nr08616a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Multiple cation-substitution is an effective method to improve the stability of organic-inorganic hybrid perovskite thin-films. Here, we apply this approach to quasi two-dimensional (quasi-2D) perovskite materials, and investigate the effect of Cs and K doping on the performance of quasi-2D perovskite LEDs (PeLEDs). It is found that Cs significantly reduces the efficiency roll-off of quasi-2D PLEDs at high current density, which leads to a high current efficiency (CE) - even at an operation current density as high as 1000 mA cm-2. In addition, the incorporation of a small amount of K further increases the device quantum efficiency thanks to its passivation effect. As a result, our green PeLED, which is based on a multi-cation quasi-2D perovskite, reaches a brightness of 45 600 cd m-2, and a maximum CE of 22.5 cd A-1. The approach introduced in this work has great potential to enhance the performance of quasi-2D perovskite light-emitting diodes.
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Affiliation(s)
- Guang Yang
- School of Electronic and Computer Engineering, Peking University Shenzhen Graduate School, Shenzhen 518055, PR China.
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