Near‐Infrared Light Emitting Metal Halides: Materials, Mechanisms, and Applications

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Фев. 21, 2024

Near-Infrared (NIR) light emitting metal halides are emerging as a new generation of optical materials owing to their appealing features, which include low-cost synthesis, solution processability, and adjustable properties. NIR-emitting perovskite-based light-emitting diodes (LEDs) have reached an external quantum efficiency (EQE) over 20% device stability 10,000 h. Such results sparked interest in exploring NIR halide emitters. In this review, several different types halides, including lead/tin bromide/iodide perovskites, lanthanide ions doped/based double low dimensional hybrid Bi

Язык: Английский

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Rare‐Earth‐Based Lead‐Free Halide Double Perovskites for Light Emission: Recent Advances and Applications

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Май 22, 2024

Abstract The double perovskite material of Cs 2 NaRECl 6 ‐type, utilizing rare‐earth (RE) ions as trivalent element, has attracted widespread interest due to its unique optoelectronic properties and wide range applications. It displays rich optical properties, including visible infrared light emission through down‐shifting, well up‐conversion radiation‐induced emission. These exceptional make it a promising for devices such detectors, light‐emitting diodes, lasers energy storage batteries but also show advantages in anti‐counterfeiting technology imaging. In this article, the latest progress is reported challenges crystal structure, preparation, performance, various applications lead‐free halide (HLDPs) compounds. This outline prospective research directions existing materials, with aim facilitating discovery new HLDPs materials.

Язык: Английский

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Lanthanide Doping into All-Inorganic Heterometallic Halide Layered Double Perovskite Nanocrystals for Multimodal Visible and Near-Infrared Emission

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(5), С. 3200 - 3209

Опубликована: Янв. 26, 2024

The introduction of lanthanide ions (Ln3+) into all-inorganic lead-free halide perovskites has captured significant attention in optoelectronic applications. However, doping Ln3+ heterometallic layered double perovskite (LDP) nanocrystals (NCs) and their associated mechanisms remain unexplored. Herein, we report the first colloidal synthesis (Yb3+, Er3+)-doped LDP NCs utilizing a modified hot-injection method. resulting exhibit efficient near-infrared (NIR) photoluminescence both NIR-I NIR-II regions, achieved through energy transfer down-conversion mechanisms. Density functional theory calculations reveal that dopants preferentially occupy Sb3+ cation positions, disruption local site symmetry lattices. By leveraging sensitizations intermediate levels, delved series Ln3+-doped Cs4M(II)Sb2Cl12 (M(II): Cd2+ or Mn2+) via co-doping strategies. Remarkably, observe brightening effect predark states Er3+ dopant Er3+-doped owing to Mn component acting as an bridge. This study not only advances our understanding doped but also propels for wider range

Язык: Английский

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Superior Multimodal Luminescence in a Stable Single‐Host Nanomaterial with Large‐Scale Synthesis for High‐Level Anti‐Counterfeiting and Encryption

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Multimode luminescent materials exhibit tunable photon emissions under different excitation or stimuli channels, endowing them high encoding capacity and confidentiality for anti-counterfeiting encryption. Achieving multimode luminescence into a stable single material presents promising but remains challenge. Here, the downshifting/upconversion emissions, color-tuning persistent (PersL), temperature-dependent multi-color hydrochromism are integrated Er3+ ions doped Cs2NaYbCl6 nanocrystals (NCs) by leveraging shallow defect levels directed energy migration. The resulting NCs display strong static dynamic colorful in response to ultraviolet, 980-nm laser, X-ray. Additionally, distinct colors as temperature increases from 330 430 K. Surprisingly, it also demonstrates ability of reversible emission modal color water. Theoretical calculations experimental characterizations reveal that self-trapped exciton state (STEs), chlorine vacancy defects, ladderlike 4f contribute multimodal luminescence. More importantly, has extremely remarkable environmental stability, which can be stored air more than 18 months, showing commercial prospects. This work not only gives new insights lanthanide-based metal halide provides route developing nanomaterials

Язык: Английский

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Multimode Luminescence Tailoring and Improvement of Cs₂NaHoCl₆ Cryolite Crystals via Sb³⁺/Yb³⁺ Alloying for Versatile Photoelectric Applications

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(45)

Опубликована: Сен. 19, 2023

Abstract Lead‐free halide double perovskites are currently gaining significant attention owing to their exceptional environmental friendliness, structural adjustability as well self‐trapped exciton emission. However, stable and efficient perovskite with multimode luminescence tunable spectra still urgently needed for multifunctional photoelectric application. Herein, holmium based cryolite materials (Cs 2 NaHoCl 6 ) anti‐thermal quenching photoluminescence were successfully synthesized. By the further alloying of Sb 3+ ( s ‐ p transitions) Yb f ions, its properties can be modulated, originating from tailoring band gap structure enriching electron transition channels. Upon substitution in Cs , additional absorption peaking at 334 nm results tremendous increase quantum yield (PLQY). Meanwhile, not only typical NIR emission around 980 Ho is enhanced, but also red emissions show a diverse range behaviors. Furthermore, through designing doping, up‐conversion triggered by changing excitation laser power density (yellow‐to‐orange) doping concentration (red‐to‐green). Through combined experimental‐theoretical approach, related mechanism revealed. In general, /Yb abundant energy level ladders constructed more modes derived, demonstrating great potential applications.

Язык: Английский

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Constructing Efficient and Thermostable Red‐NIR Emitter via Cross Relaxation and Crystal‐Field Engineering of Holmium‐Based Perovskite‐Type Half Metal

Laser & Photonics Review, Год журнала: 2023, Номер 18(5)

Опубликована: Дек. 31, 2023

Abstract Lanthanide ions, as dopants, have evoked widespread research interest owing to the rich optical, magnetic, and electrical properties, but their luminescent intensity is always limited by typical concentration quenching. Herein, a holmium‐based double perovskite of Cs 2 NaHoCl 6 reported, which surprisingly breaks through this barrier achieves efficient red‐NIR emission virtue large unit cell, low phonon energy, high content activators, cross relaxation phenomenon between Ho 3+ . The heavy also endows intriguing half‐metallic nature with down‐spin conducting band an up‐spin insulating band. After performing ion doping on crystallographic sites Na + , photoluminescence quantum yield such emitter under 450 nm excitation dramatically promoted 82.3%, benefiting from improved crystal field environment that alleviates parity forbidden rule suppresses non‐radiative recombination loss. Furthermore, heat‐favorable phonon‐assisted population processes enable robust photostability against thermal By combining chip, light‐emitting diodes are fabricated, in wide‐coverage NIR emissions ideally suited for medical light source, night vision, nondestructive examination, transmission imaging. It believed work will open avenue enhancing fluorescence lanthanide ions developing advanced spintronic materials.

Язык: Английский

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Near-Infrared Circularly Polarized Luminescent Physical Unclonable Functions

ACS Nano, Год журнала: 2024, Номер 18(24), С. 15888 - 15897

Опубликована: Июнь 6, 2024

Distinguished from traditional physical unclonable functions (PUFs), optical PUFs derive their encoded information the properties of materials, offering distinct advantages, including solution processability, material versatility, and tunable luminescence performance. However, existing research on has predominantly centered visible photoluminescence, while advanced based higher-level covert light remain unexplored. In this study, we present utilization near-infrared circularly polarized (NIR-CPL). This interesting property is achieved by incorporating Yb-doped metal halide perovskite nanocrystals (Yb-PeNCs) possessing NIR emission into chiral imprinted photonic (CIP) films. By employing a solvent immersion method, successfully integrated Yb-PeNCs these CIP films, thereby creating an optically surface. The resulting NIR-CPL adds layer security to PUF systems. These findings underscore potential solution-processable films play pivotal role in advancing next generation PUFs.

Язык: Английский

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Multimode Luminescence with Temperature and Energy Level Synergistic Dependence in Rare Earth Halide DPs for Advanced Multifunctional Applications

Small, Год журнала: 2024, Номер 20(35)

Опубликована: Апрель 29, 2024

Abstract Rare‐earth halide double perovskites (DPs) have attracted extensive attention due to their excellent optoelectronic performance. However, the correlation between luminescence performance, crystal structure, and temperature, as well inherent energy transfer mechanism, is not understood. Herein, Lanthanide ions (Ln 3+ : Nd or Dy ) co‐dopants are incorporated into Sb doped Cs 2 NaYbCl 6 DPs construct (ET) models reveal effects of temperature levels rare earth on ET. The different excited state structures ‐Ln at temperatures relative positions synergistically determine physical processes luminescence. These multi‐mode luminescent materials exhibit good performance in anti‐counterfeiting, NIR imaging, sensing. This work provides new insights mechanism related photophysical process.

Язык: Английский

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Recent Developments in Halide Perovskite Nanocrystals for Indirect X‐ray Detection

Advanced Materials Technologies, Год журнала: 2024, Номер 9(20)

Опубликована: Май 26, 2024

Abstract Metal halide perovskites are revolutionizing X‐ray detection through a combination of low cost, solution processing, favorable optoelectronic properties, and high stopping power for high‐energy ionizing radiation. While perovskite single crystals polycrystalline wafers considered direct converters, most medical applications based on scintillators that shift radiation into the visible. Several materials market, but demonstrations CsPbBr 3 nanocrystals, possibly embedded in matrix material or combined with organic molecules as luminescent species, highlight their competitiveness established terms radioluminescence yield transient behavior. Major hurdles nanocrystal must overcome environmental stability toxicity. there still few examples high‐performance lead‐free scintillators, microcrystalline emerging promising reduced toxicity, significant Stokes shifts to avoid reabsorption emission thick films. Thus, near future scintillator will primarily be adoption recipes proven properties form. The colloidal solutions facilitate large‐scale printing homogeneous scattering‐free films obtain contrast spatial resolution images by scintillation.

Язык: Английский

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Heterostructured Lanthanide Perovskite Nanoparticles with High Quantum Yield and Water Stability for Optical Information Storage

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 8, 2025

Abstract In this study, heterostructured nanoparticles based on lanthanide double perovskite halide are innovatively proposed, which dramatically improved quantum yield and color purity, but the problem of water stability materials has also been solved. The without surface ligands have excellent optical properties when dispersed in water, higher purity than those organic solvents. Besides, application potential is demonstrated practical performance verified by preparing luminescent ink. This study provides a new strategy for enhancement prospect perovskite.

Язык: Английский

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