Indium-antimony-halide single crystals for high-efficiency white-light emission and anti-counterfeiting

Science Advances, Journal Year: 2021, Volume and Issue: 7(34)

Published: Aug. 20, 2021

Indium-antimony bimetallic halide single crystal exhibits single-source white-light emission and anti-counterfeiting potential.

Language: Английский

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Zero‐Dimensional Zn‐Based Halides with Ultra‐Long Room‐Temperature Phosphorescence for Time‐Resolved Anti‐Counterfeiting

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(33)

Published: June 15, 2022

Though fluorescence-tag-based anti-counterfeiting technology has distinguished itself with cost-effective features and huge information loading capacity, the clonable decryption process of spatial-resolved cannot meet requirements for high-security-level anti-counterfeiting. Herein, we demonstrate a spatial-time-dual-resolved system based on new organic-inorganic hybrid halides BAPPZn2 (Cly Br1-y )8 (BAPP=1,4-bis(3-ammoniopropyl)piperazinium, y=0-1) ultra-long room-temperature phosphorescence (RTP). Remarkably, afterglow lifetime can be facilely tuned by regulating halide-induced heavy-atom effect identified naked eyes or help simple machine vision system. Therefore, short-lived unicolor fluorescence lasting-time-tunable RTP provide prerequisites unicolor-time-resolved anti-counterfeiting, which lowers decryption-device further provides design strategy advanced portable technology.

Language: Английский

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Efficient Broadband Near‐Infrared Emission from Lead‐Free Halide Double Perovskite Single Crystal

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(33)

Published: June 21, 2022

Ultra-broadband near-infrared (NIR) luminescent materials are the most important component of NIR light-emitting devices (LED) and crucial for their performance in sensing applications. A major challenge is to design novel replace traditional Cr3+ -doped systems. We report an all-inorganic bismuth halide perovskite Cs2 AgBiCl6 single crystal that achieves efficient broadband emission by introducing Na ions. Experiments density functional theory (DFT) calculations show originates from self-trapped excitons (STE) emission, which can be enhanced weakening strong coupling between electrons phonons. The high photoluminescence quantum efficiency (PLQY) 51 %, extensive full width at half maximum (FWHM) 270 nm stability provide advantages as a material. single-crystal-based LED demonstrated its potential applications spectral detection well night vision.

Language: Английский

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Dual‐Band‐Tunable White‐Light Emission from Bi³⁺/Te⁴⁺ Emitters in Perovskite‐Derivative Cs₂SnCl₆ Microcrystals

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(9)

Published: Jan. 4, 2022

Luminescent metal halides have attracted considerable attention in next-generation solid-state lighting because of their superior optical properties and easy solution processibility. Herein, we report a new class highly efficient dual-band-tunable white-light emitters based on Bi3+ /Te4+ co-doped perovskite derivative Cs2 SnCl6 microcrystals. Owing to the strong electron-phonon coupling energy transfer from Te4+ , microcrystals exhibited broad dual-band emission originating inter-configurational 3 P0,1 →1 S0 transitions with good stability high photoluminescence (PL) quantum yield up 68.3 %. Specifically, remarkable transition -PL lifetime milliseconds at 10 K microseconds 300 was observed, as solid evidence for isolated emission. These findings provide not only insights into excited-state dynamics but also general approach achieve single-composition lead-free through ns2 -metal ion co-doping.

Language: Английский

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Crystal-Liquid-Glass Transition and Near-Unity Photoluminescence Quantum Yield in Low Melting Point Hybrid Metal Halides

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(22), P. 12360 - 12369

Published: May 25, 2023

Hybrid metal halides (HMHs) are a class of materials that combine extraordinary photophysical properties and excellent processability. Their chemical variability allows for the solid-liquid transition toward melt-processable HMHs. Herein, we report design synthesis zero-dimensional HMHs [M(DMSO)6][SbCl6], where isolated octahedra [M(DMSO)6]3+ [SbCl6]3- alternatively aligned in crystal structure. The luminescent center enables photogeneration self-trapped excitons, resulting broadband photoluminescence with large Stokes shift nearly 100% quantum yield. Meanwhile, release DMSO ligands from is controlled by M-O coordination thus low melting point ∼90 °C achieved Interestingly, glass phase obtained melt quenching, sharp change colors compared to robust crystal-liquid-glass opens new avenue tailoring structural disorder optoelectronic performance organic-inorganic materials.

Language: Английский

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Multiple Stimuli‐Responsive Luminescent Chiral Hybrid Antimony Chlorides for Anti‐Counterfeiting and Encryption Applications

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(36)

Published: July 18, 2023

Stimuli-responsive circularly polarized luminescence (CPL) materials are ideal for information anti-countering applications, but the best-performing have not yet been identified. This work presents enantiomorphic hybrid antimony halides R-(C5 H12 NO)2 SbCl5 (1) and S-(C5 (2) showing mirror-imaged CPL activity with a dissymmetry factor of 1.2×10-3 . Interestingly, DMF-induced structural transformation is realized to obtain non-emissive ⋅ DMF (3) (4) upon exposure vapor. The process reversed heating. DFT calculations showed that DMF-induced-quenched-luminescence attributed intersection ground excited state curves on configuration coordinates. Unexpectedly, nanocrystals chiral 1 2 were prepared indicate excellent solution performance. reversible PL switching gives system applications in technology, anti-counterfeiting, encryption-decryption, logic gates.

Language: Английский

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Advanced Optical Information Encryption Enabled by Polychromatic and Stimuli‐Responsive Luminescence of Sb‐Doped Double Perovskites

Advanced Science, Journal Year: 2024, Volume and Issue: 11(24)

Published: April 16, 2024

Abstract The smart materials with multi‐color and stimuli‐responsive luminescence are very promising for next generation of optical information encryption anti‐counterfeiting, but these still scarce. Herein, a multi‐level strategy is developed based on the polychromatic emission Sb‐doped double perovskite powders (SDPPs). Cs 2 NaInCl 6 :Sb, KInCl AgInCl :Sb synthesized through coprecipitation methods exhibit broadband emissions bright blue, cyan, orange colors, respectively. transmitted by specific SDPP encrypted when different SDPPs mixed. confidential can be decrypted selecting corresponding narrowband filter. Then, an quick response (QR) code improved security demonstrated this multi‐channel selection strategy. Moreover, three types water‐triggered switching behaviors. represented erased/recovered simple water spray/drying. Whereas, collected from green channel permanently erased moisture, which fundamentally avoids leakage. Therefore, schemes designed to meet variety requirements. multicolor greatly enrich flexibility encryption, leaps level confidentiality.

Language: Английский

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Efficient and Stable Multicolor Emissions of the Coumarin‐Modified Cs₃LnCl₆ Lead‐Free Perovskite Nanocrystals and LED Application

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(18)

Published: Jan. 30, 2024

Abstract Lanthanide‐based lead‐free perovskite materials hold great promise for the development of high‐resolution full‐color displays in future. Here, various Cs 3 LnCl 6 nanocrystals (NCs) emitting light across visible to near‐infrared spectrum with remarkably high photoluminescence quantum yield (PLQY) are systemically prepared. Especially, by introducing multifunctional coumarin small molecules into EuCl NCs as an intermediate state, can achieve impressive PLQY 92.4% pure red emission and exceptional energy transfer efficiency nearly 93.2%. Furthermore, lanthanide‐based electroluminescent devices red, green, blue successfully fabricated. Among them, ‐NC‐based light‐emitting diode (LED) demonstrates a FWHM 18 nm at 617 nm, external up 5.17%, maximum brightness 2373 cd m −2 , which is most excellent reported narrowband (within 20 nm) devices. Notably, these exhibit operating half‐life 440 h level 100 surpassing performance LEDs (PLEDs). This work opens exciting possibilities future commercialization PLEDs display industry, paving way more vibrant, energy‐efficient, long‐lasting technologies.

Language: Английский

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Highly Luminescent One‐Dimensional Organic–Inorganic Hybrid Double‐Perovskite‐Inspired Materials for Single‐Component Warm White‐Light‐Emitting Diodes

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(2)

Published: Nov. 15, 2022

Double perovskites (DPs) are one of the most promising candidates for developing white light-emitting diodes (WLEDs) owing to their intrinsic broadband emission from self-trapped excitons (STEs). Translation three-dimensional (3D) DPs one-dimensional (1D) analogues, which could break octahedral tolerance factor limit, is so far remaining unexplored. Herein, by employing a fluorinated organic cation, we report series highly luminescent 1D DP-inspired materials, (DFPD)2 MI InBr6 (DFPD=4,4-difluoropiperidinium, =K+ and Rb+ ). Highly efficient warm-white photoluminescence quantum yield 92 % achieved doping 0.3 Sb3+ in KInBr6 . Furthermore, single-component warm-WLEDs fabricated with :Sb luminance 300 cd/m2 , best-performing lead-free metal-halides WLEDs reported far. Our study expands scope In-based 3D 1D, exhibit superior optical performances broad application prospects.

Language: Английский

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Te4+-doped Cs2InCl5·H2O single crystals for remote optical thermometry

Science China Materials, Journal Year: 2021, Volume and Issue: 65(3), P. 764 - 772

Published: Oct. 13, 2021

Language: Английский

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