Screening Thermochromic Luminescent Materials in Cs‐Cd‐Br Ternary Phase Diagram for Temperature Visualization Applications

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(9)

Published: April 20, 2024

Abstract Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram‐driven strategy for designing TLMs Cs–Cd–Br ternary system is presented. The room stable Cs 7 Cd 3 Br 13 crystal first obtained by utilizing facile hydrothermal method, self‐trapped exciton (STE) luminescence improved breaking local symmetry via Mg 2+ doping. Then thermochromic further realized Mn co‐doped on basis of reversible structural transition metastable 2 CdBr 4 under stimuli. emission color change from bright yellow green benefits variation fields around , which can be switched heating cooling circulations. Finally, resulting material used as demo visualize homemade high‐frequency induction sintering platform.

Language: Английский

---

Direct Evidence of the Effect of Water Molecules Position in the Spectroscopy, Dynamics, and Lighting Performance of an Eco‐Friendly Mn‐Based Organic–Inorganic Metal Halide Material for High‐Performance LEDs and Solvent Vapor Sensing

Advanced Science, Journal Year: 2024, Volume and Issue: 11(26)

Published: April 24, 2024

Abstract Luminescent Mn(II)‐based organic–inorganic hybrid halides have drawn attention as potential materials for sensing and photonics applications. Here, the synthesis characterization of methylammonium (MA) manganese bromide ((MA) n Br x Mn(H 2 O) , ( = 1, 4 3, 6)) with different stoichiometries organic cation inorganic counterpart, are reported. While Mn 2+ centers an octahedral conformation, two coordinating water molecules found either in cis 1 ) or trans positions. The photophysical behavior reflects luminescence environment. Although also has coordination, at room temperature dual emission bands ≈530 ≈660 nm observed, explained terms from tetragonally compressed octahedra self‐trapped excitons (STEs), respectively. Above temperature, shows quasi‐tetrahedral intense green emission, while temperatures below 140 K, another STE band emerges 570 nm. Time‐resolved experiments (77–360 K) provide a clear picture excited dynamics . rising components due to STEs formation equilibrated their precursors. Finally, these fabrication color‐tunable down‐converted light‐emitting diode (LED) detecting polar solvent vapors is shown.

Language: Английский

---

Ligand‐Induced Digital Programmable Photochromic CdS Materials Toward Dual‐Mode Light‐Printing and Information Encryption

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

Published: May 9, 2024

Abstract The explosive growth of information and its widespread availability underscores the need for robust encryption anticounterfeiting measures. In this study, CdS quantum dots are engineered (QDs) to manifest multiple visual responses a single trigger through strategic ligand design. surface engineering method allows QDs transition from yellow black upon photoexcitation‐induced electron transfer Cd(II) Cd(0). Surface ligands desorption under hole injection, leading an increase in size resulting redshift photoluminescence. This redox reaction reveals unprecedented photochromism photoluminescence phenomena, establishing foundation advanced protection Utilizing these QDs, excellent writing performance UV irradiation is achieved solid‐state substrates, while dual‐mode system realized gel matrices, opening up new avenues as well cumulative interactive protection. Furthermore, employed ink 3D printing, enabling creation digitally programmable materials with distinct temporally evolving appearances by controlling oxygen content regulate rate photochromism. advancement also sheds light on progress printing technology.

Language: Английский

---

Guest‐Dependent Stimuli‐Responsive Photoluminescence in 0D Antimony Chlorides for Anticounterfeiting and Encryption Applications

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

Published: Sept. 28, 2024

Abstract 0D lead‐free metal halides with stimuli‐responsive photoluminescence (PL) have attracted great attention as promising smart materials for advanced anticounterfeiting and information encryption. However, designing high‐performance remains a challenge. Herein, solvent guest tuning strategy to develop is proposed. Three novel highly yellow‐emissive host‐guest systems, TMA 2 SbCl 5 ·X (TMA: (CH 3 ) 4 N + , X = DMSO, DMF, MeCN) are synthesized. Under heat stimuli, (X DMSO DMF) exhibits PL on‐off switching, while ·MeCN shows color change from yellow orange, due structural phase transitions. Particularly, ·DMSO demonstrate fast response within 50 s at temperatures above 353 K. Detailed in situ XRD diffraction study unveils the role of molecules regulation For first time, it found that systems possess guest‐dependent evolution results different stimuli. In addition, moister can also trigger transition induce switching. The remarkable stimuli performance makes these hybrids encryption applications. These findings provide new insights development halide materials.

Language: Английский

---

Highly Efficient Circularly Polarized Electroluminescence Based on Chiral Manganese (II) Complexes

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Eco-friendly chiral Mn complexes with Binapo ligands show red CPL ( g lum = 5.1 × 10 −3 ) and efficient (EQE > 4% EL −8.5 ), outperforming many Pt Ir-based devices, paving the way for sustainable materials.

Language: Английский

---

Multilevel Stimulus‐Responsive Room Temperature Phosphorescence Achieved by Efficient Energy Transfer from Triplet Excitons to Mn²⁺ Pairs in 2D Hybrid Metal Halide

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

Published: Dec. 13, 2024

Abstract Synthesis of color‐tunable ultralong room temperature phosphorescence (RTP) crystals with multilevel stimuli‐responsive properties is highly desirable due to their tremendous application prospects but has rarely been explored. Herein, a 2D organic–inorganic metal‐halide hybrid (ABA 2 CdCl 4 ) originally designed and synthesized efficient blue fluorescence green RTP through Cd induced heavy atom effect. Due the improved intermolecular interactions enhanced light absorption, high efficiency up 34% achieved in ABA 4. With as prototype, Mn 2+ ‐doping strategy successfully employed construct multicomponent material wide‐tunable property response external stimulus such time, light. More importantly, pairs are formed ‐doped , which observed hybrids for first time. thermal assisted energy transfer from triplet excitons (organic unit) pairs, thermally activated emission tunable colors between 270 333 K easily realized, showing highest sensitivity against reported so far. By virtue above advantages, materials applied information storage sensors. The work promotes development multi‐stimuli responsive systems based on metal halides.

Language: Английский

---

Enhancing the stability of Cs3Bi2Br9 quantum dots for anti-counterfeiting applications in leather through polyacrylate coating

Journal of Materials Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Utilizing polyacrylate to improve the stability of perovskite quantum dots for application in leather anti-counterfeiting.

Language: Английский

---

Light driven CsPbI3 perovskite quantum dots core-shell transformation for Snapchat type anti-counterfeiting and encryption in 4D codes

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160847 - 160847

Published: Feb. 1, 2025

Language: Английский

---

Color-tunable supramolecular luminescent materials for information anticounterfeiting

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

---

“Confined Eutectic” Strategy for Visual Refrigeration Responsive Fluorescent Materials with Easy Preparation and Multi‐Color Tunability

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

The temperature response window is a very critical parameter for evaluating sensing performance of thermofluorochromic materials, and its regulation has long been key focus in this field. Especially, the indication refrigeration great significance as it relates to public health food safety. However, developing fluorochromic materials capable visually reading out remains challenges. Herein, "confined eutectic" strategy proposed develop that are easy prepare can naked-eye recognition temperature. Through supramolecular interactions between dopant host matrix, eutectic micro-domains formed their crystallization point effectively lowered into range 0-10 °C. excellent crystalline matrix provides "confinement" effect, thereby enhancing crystallinity eutectics, which enables precise aggregation dispersion surrounding fluorophores, resulting significant color changes. mechanism validated through variable-temperature fluorescence spectra, confocal laser scanning microscopy phase diagram analysis. obtained exhibit high contrast, apply diverse dyes multi-mode multi-color readout. This work not only open up new insights responsive but also way visual crystallinity.

Language: Английский

---