Stimuli‐Responsive Emission from Hybrid Metal Halides

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(17)

Published: Jan. 7, 2024

Abstract Stimuli‐responsive photoluminescent (PL) materials have attracted considerable attention in recent years owing to their potential applications anti‐counterfeiting, information encryption, and sensing. Further investigations of the transformation mechanism stimulus‐responsive PL are considerably important. In current study, an organic–inorganic metal halide, C 9 H 15 N 3 SbCl 5 ([C 13 ] 2+ is a 1‐(2‐pyridyl) piperazine cation) obtained, which exhibits 0D structure with P‐ 1 space group. At room temperature, when excited by UV light, single crystals exhibit unimodal blue light emission at 405 nm, grinding or hydrostatic pressure induces double‐peak emissions 650 nm. Interestingly, double‐emission samples can be restored single‐emission short annealing storage air for 2 weeks, this process reversible. Luminescence response mechanical stimuli also achieved presence hydrochloric acid water. Spectral analysis microstructural changes revealed that structural modifications inorganic group play pivotal role stimulus. Finally, composite film device based on prepared demonstrate these smart anti‐counterfeiting sensing applications.

Language: Английский

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Erbium‐Induced Boost in Self‐Trapped Exciton Emission of Double Perovskites for Highly Sensitive Multimodal and Multiplexed Optical Thermography

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 16, 2024

Abstract Self‐trapped excitons (STEs) of lead‐free perovskites have aroused tremendous interest in remote optical thermometry due to strong exciton–phonon coupling and large Stokes shifts. Herein, a bright multimodal multiplexed thermometer is constructed with high sensitivity ( S r ) self‐calibrating ability based on Cs 2 NaInCl 6 :Er 3+ double perovskite, allowing for fast simplified reading via mobile devices. Intriguingly, Er doping not only shows the characteristic green emissions but also introduces nanoelectronic domains through new localized valance band maximum breaks symmetry In site, which facilitates generation more STEs. The temperature‐sensitive blue emission STEs temperature‐insensitive endow including time‐resolved ratiometric readout schemes 3.8% K −1 , where an upconversion primary serves as reference calibrate other modes. Meanwhile, designed thermometers show robust photostability, repeatability, structural stability long‐time working storage. addition, remarkable thermochromic phenomenon from enables quick color‐multiplexed thermography smartphone, utilized capture real‐time 2D thermal imaging microelectronic This work demonstrates great potential perovskite low‐cost portable thermometry.

Language: Английский

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Highly Efficient Light‐Emitting Diodes Based on an Organic Antimony(III) Halide Hybrid

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 61(6)

Published: Nov. 16, 2021

As low-dimensional lead-free hybrids with higher stability and lower toxicity than those of three-dimensional lead perovskites, organic antimony(III) halides show great application potential in opt-electronic field owing to diverse topologies along exceptional optical properties. We report herein an hybrid (MePPh3 )2 SbCl5 a zero-dimensional (0D) structure, which exhibits brilliant orange emission peaked at 593 nm near-unity photoluminescent quantum yield (99.4 %). The characterization photophysical properties demonstrates that the broadband microsecond lifetime (3.24 μs) arises from self-trapped (STE). Electrically driven light-emitting diodes (OLEDs) based on neat doped films were fabricated. devices significant improvement comparison non-doped OLEDs. Owing much improved surface morphology balanced carrier transport layers devices, peak luminance, current efficiency (CE) external (EQE) are boosted 82 cd m-2 3500 , 1.1 A-1 6.8 0.7 % 3.1 relative respectively.

Language: Английский

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Crystalline‐Phase‐Recognition‐Induced Domino Phase Transition and Luminescence Switching for Advanced Information Encryption

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(43), P. 23373 - 23379

Published: Aug. 17, 2021

Abstract Herein, a new mechanism, namely, crystalline phase recognition (CPR), is proposed for the single‐crystal‐to‐single‐crystal (SCSC) transition of metal halides. Chiral β‐[Bmmim] 2 SbCl 5 (Bmmim=1‐butyl‐2,3‐methylimidazolium) can recognize achiral α‐[Bmmim] on basis key–lock feature through intercontact their single crystals, resulting in domino (DPT). The concomitant photoluminescence (PL) switching enables observation DPT situ. liquid eutectic interface, stress–strain transfer, and feasible thermodynamics are key issues CPR. DFT calculations PL measurements revealed that optical absorption emission isomers mainly originate from [SbCl ] 2− anions. structural effects (e.g., supramolecular interactions distortion) clarified. As novel type stimuli response, CPR‐induced luminescence exhibit potential application advanced time‐resolved information encryption.

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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Defect Passivation in Air‐Stable Tin(IV)‐Halide Single Crystal for Emissive Self‐Trapped Excitons

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(51)

Published: Sept. 17, 2021

Abstract Tin(IV)‐based metal halides are promising optoelectronic materials due to their robust structure and eco‐friendly nature, but these exhibit poor photoluminescence (PL) properties the underlying mechanisms still elusive. Here, a novel air‐stable hybrid Sn 4+ ‐halide material (C 8 H 22 N 2 Cl) SnCl 6 that is resistant moisture ( > 70% relative humidity) for 1 year reported. The inferior PL property of limited by lattice defects crystal structure, which however could be effectively improved introducing Sb 3+ ion with stereoactive 5s lone pair. As result, ‐doped exhibits superbly stable room‐temperature centered at 690 nm an unprecedented quantum yield (QY) 41.76% from self‐trapped excitons, highest PLQY tin(IV)‐based perovskite materials. efficiency attributed defect passivation remarkable distortion induced dopants. This dopant‐induced exciton self‐trapping approach offers avenue improve performance.

Language: Английский

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Ultrafast Study of Exciton Transfer in Sb(III)-Doped Two-Dimensional [NH₃(CH₂)₄NH₃]CdBr₄ Perovskite

ACS Nano, Journal Year: 2021, Volume and Issue: 15(9), P. 15354 - 15361

Published: Sept. 15, 2021

Antimony-based metal halide hybrids have attracted enormous attention due to the stereoactive 5s2 electron pair that drives intense triplet broadband emission. However, energy/charge transfer has been rarely achieved for Sb3+-doped materials. Herein, Sb3+ ions are homogeneously doped into 2D [NH3(CH2)4NH3]CdBr4 perovskite (Cd-PVK) using a wet-chemical method. Compared weak singlet exciton emission of Cd-PVK at 380 nm, 0.01% exhibits located 640 nm with near-unity quantum yield. Further increasing doping concentration completely quenches Cd-PVK, concurrently enhanced Delayed luminescence and femtosecond-transient absorption studies suggest originates from (ET) host dopant, while such ET cannot occur Pb2+-doped because mismatch energy levels. In addition, density function theory calculations indicate introduced likely replace Cd2+ along deprotonation butanediammonium charge balance, instead generating vacancies. This work provides deeper understanding suggests an effective strategy achieve efficient beyond 0D Cl-based hybrids.

Language: Английский

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Photoluminescent ionic metal halides based on s2 typed ions and aprotic ionic liquid cations

Coordination Chemistry Reviews, Journal Year: 2021, Volume and Issue: 448, P. 214185 - 214185

Published: Sept. 7, 2021

Language: Английский

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Efficient Red Light Emitting Diodes Based on a Zero‐Dimensional Organic Antimony Halide Hybrid

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(9)

Published: Dec. 16, 2022

Zero-dimensional (0D) organic metal halide hybrids (OMHHs) have recently emerged as a new class of light emitting materials with exceptional color tunability. While near-unity photoluminescence quantum efficiencies (PLQEs) are routinely obtained for large number 0D OMHHs, it remains challenging to apply them emitter electrically driven diodes (LEDs), largely due the low conductivity wide bandgap cations. Here, development OMHH, triphenyl(9-phenyl-9H-carbazol-3-yl) phosphonium antimony bromide (TPPcarzSbBr4 ), efficient LEDs, which consists semiconducting cations (TPPcarz+ ) and anions (Sb2 Br82- is reported. By replacing one phenyl groups in well-known tetraphenylphosphonium cation (TPP+ an electroactive phenylcarbazole group, TPPcarz+ developed preparation red TPPcarzSbBr4 single crystals high PLQE 93.8%. With solution processed thin films (PLQE 86.1%) layer, LEDs fabricated exhibit external efficiency (EQE) 5.12%, peak luminance 5957 cd m-2 , current 14.2 A-1 best values reported date electroluminescence devices based on OMHHs.

Language: Английский

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Molecular dimensionality and photoluminescence of hybrid metal halides

Trends in Chemistry, Journal Year: 2022, Volume and Issue: 4(11), P. 1034 - 1044

Published: Sept. 15, 2022

Language: Английский

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