Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(11)

Published: Aug. 7, 2022

Abstract Cr 3+ /Cr 4+ ‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, so on. Plenty of excellent NIR are developed by introducing ion various inorganic hosts. Herein, the effect crystal field on luminescence combining Tanabe–Sugano energy level diagram configuration coordinate model is discussed. Research progress ‐doped materials, including phosphors designed from structural models with octahedral, tetrahedral, other coordination types, then outlined. The properties more than 200 kinds summarized. In particular, several strategies for tuning wavelength, broadening band, enhancing efficiency, improving thermal stability, listed. Finally, current challenges future prospects research presented. This review will contribute a deeper understanding not only mechanism but also chromium‐doped as develop better performance explore applications.

Language: Английский

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Recent Advances in Chromium‐Doped Near‐Infrared Luminescent Materials: Fundamentals, Optimization Strategies, and Applications

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(3)

Published: Dec. 5, 2022

Abstract Development of chromium‐doped luminescent materials is pertinent to many emerging applications, ranging from agriculture, food industry noninvasive health monitoring. The fundamental importance chromium‐activated in the field optics and biomedicine makes rapid development novel relevant applications. Herein, recent advances on luminescence principle photoluminescence (PL) optimization for Cr 3+ ‐activated together with their potential applications are reviewed. different types most recently developed ‐doped design principles systematically summarized. associations between crystal structure near‐infrared (NIR) PL properties, as well performance‐evaluating parameters introduced examples known NIR emitting phosphors, which will be helpful explore future materials. Based control, site engineering, electron–phonon coupling, several efficient strategies optimizing performances including bandwidth, thermal stability, quantum efficiency proposed. Then, fields analysis, night vision, information encryption, optical sensors surveyed. Finally, challenges promising

Language: Английский

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Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospective

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(6)

Published: Oct. 27, 2023

Abstract Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, emerged as promising candidates for high‐performance solar cells, light‐emitting diodes (LEDs), lasers, photodetectors, radiation detectors. The impressive optical optoelectronic properties, along with rapid increase efficiencies cells LEDs, greatly attracted researchers across many disciplines. However, most advances made so far terms preparation (colloidal nanocrystals films), devices highest are based on Pb‐based halide which raised concerns over their commercialization due to toxicity Pb. This has triggered search lower‐toxicity Pb‐free perovskites led significant progress last few years. In this roadmap review, different expertise joined together summarize latest progress, outstanding challenges, future directions perovskite regarding synthesis, spectroscopy, devices, guide currently working area well those that will join field future.

Language: Английский

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Highly Distorted Antimony(III) Chloride [Sb₂Cl₈]²⁻ Dimers for Near‐Infrared Luminescence up to 1070 nm

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

Published: June 23, 2022

Zero-dimensional (0D) hybrid metal halides with unique compositional and structural tunability appear as an emerging class of luminescent materials, but near-infrared (NIR) emitters therein are largely unexplored to date. This study presents three novel 0D antimony chlorines edge-sharing [Sb2 Cl8 ]2- dimers, showing unusual room-temperature broadband NIR emission the maximum wavelength up 1070 nm. Photoluminescence studies density functional theory calculation demonstrate that emissions originate from highly localized excitons, confined dimers in these structures show low symmetry a large degree freedom. These expand range new materials halides.

Language: Английский

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Broadband Short-Wave Infrared-Emitting MgGa₂O₄:Cr³⁺, Ni²⁺ Phosphor with Near-Unity Internal Quantum Efficiency and High Thermal Stability for Light-Emitting Diode Applications

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(27), P. 32580 - 32588

Published: June 29, 2023

Blue InGaN chip-pumped short-wave infrared (SWIR) emitters have aroused tremendous attention and shown emerging applications in diverse fields such as healthcare, retail, agriculture. However, discovering blue light-emitting diode (LED)-pumped SWIR phosphors with a central emission wavelength over 1000 nm remains significant challenge. Herein, we demonstrate the efficient broadband luminescence of Ni2+ by simultaneously incorporating Cr3+ ions into MgGa2O4 lattice, sensitizer emitter. Because strong light absorption high energy transfer efficiency to Ni2+, obtained MgGa2O4:Cr3+, show intense peak at 1260 full width half maximum (FWHM) 222 under excitation light. The optimized phosphor presents an ultra-high photoluminescence quantum 96.5% outstanding thermal stability (67.9%@150 °C). A source has been fabricated through combination prepared commercial 450 LED chip, delivering radiant power 14.9 mW 150 mA input current. This work not only demonstrates feasibility developing high-power using converter technology but also new insights importance technology.

Language: Английский

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Achieving Broadband NIR-I to NIR-II Emission in an All-Inorganic Halide Double-Perovskite Cs₂NaYCl₆:Cr³⁺ Phosphor for Night Vision Imaging

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(33), P. 39550 - 39558

Published: Aug. 10, 2023

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) offer numerous advantages, including compact size, tunable emission spectra, energy efficiency, and high integration potential. These features make them highly promising for various applications, such as night vision monitoring, food safety inspection, biomedical imaging, theragnostics. All-inorganic halide double-perovskite materials, known their large absorption cross section, excellent defect tolerance, long carrier diffusion radius, serve unique matrices constructing near-infrared fluorescent materials. In this study, we successfully prepared the all-inorganic metal Cs2NaYCl6:Cr3+ using a grinding-sintering method. A small fraction of [YCl6] octahedra within host material's lattice was substituted with Cr3+ ions, resulting in creation phosphor. When excited λ = 310 nm UV light, phosphor exhibited broad range spanning from 800 to 1400 nm, covering NIR-I NIR-II regions. It had bandwidth 185 achieved fluorescence quantum yield 20.2%. The broadband originates weak crystal field environment provided by Cs2NaYCl6 matrix, which enhances luminescence properties ions. To create NIR pc-LEDs, encapsulated onto commercially available LED chip operating at nm. potential application these pc-LEDs imaging validated.

Language: Английский

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Broad-Band Sensitization in Cr³⁺–Er³⁺ Co-Doped Cs₂AgInCl₆ Double Perovskites with 1.5 μm Near-Infrared Emission

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(14), P. 5291 - 5299

Published: June 30, 2023

Lanthanide (Ln3+)-doped metal halide perovskites with near-infrared (NIR) luminescence have received great attention; however, they suffer from low NIR efficiency, especially for 1.5 μm emission of Er3+ ions. Herein, a Cr3+–Er3+ co-doped Cs2AgInCl6 double perovskite is successfully synthesized using simple solution precipitation method. Besides broad-band 4T2 → 4A2 transition Cr3+ ions centered at 1010 nm, the sample exhibits an NIR-II peak 1540 nm assigned to 4I13/2 4I15/2 can be sensitized by that absorption ultraviolet region (250–900 nm). Excitingly, through assisted post-annealing treatment eliminate defect states, obtains unprecedented high photoluminescence quantum yield (PLQY) 57.5% (Er3+ emission: ∼29.0%), which highest value Ln3+-doped lead-free present. The admirable stability and dual bands pave way light sources pumped multicolor light-emitting diode (LED) chips in potential optical communication, night-vision, infrared imaging applications.

Language: Английский

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Broad Dual Emission by Codoping Cr³⁺(d→d) and Bi³⁺(s→p) in Cs₂Ag_0.6Na_0.4InCl₆Double Perovskite

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(33)

Published: June 28, 2023

A phosphor emitting both white light and broad near-infrared (NIR) radiation can simultaneously provide visual inspection early signs of rotting food products. The NIR emission is absorbed by the vibrational overtones water molecules present in items, providing non-invasive image contrast to assess freshness. Here we design a phosphor, namely, Cr3+ -Bi3+ -codoped Cs2 Ag0.6 Na0.4 InCl6 , that emit warm (1000 nm) with quantum yield 27 %. This dual emitter designed combining features s2 -electron (Bi3+ ) d3 (Cr3+ doping weak crystal field halide perovskite host. 6s2→6s16p1${6{s}^{2}\to 6{s}^{1}6{p}^{1}}$ excitation Bi3+ using commercial 370 nm ultraviolet light-emitting-diodes (UV-LED), yields emissions. fraction excited dopants light, other transfers its energy non-radiatively . Then de-excites emission. Temperature dependent (6.4-300 K) photoluminescence combination Tanabe-Sugano diagram show experiences ( Dq/B${{D}_{q}/B}$ =2.2), yielding 4T2→4A2${{{\rm \ }}^{4}{{\rm T}}_{2}\to {{\rm A}}_{2}}$ As proof concept, fabricated panel containing 122 phosphor-converted LEDs, demonstrating capability inspect

Language: Английский

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

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(21)

Published: Feb. 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

Language: Английский

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Near‐infrared emitting metal halide materials: Luminescence design and applications

InfoMat, Journal Year: 2024, Volume and Issue: 6(5)

Published: March 28, 2024

Abstract Near‐infrared (NIR) luminescent metal halide (LMH) materials have attracted great attention in various optoelectronic applications due to their low‐temperature solution‐processable synthesis, abundant crystallographic/electronic structures, and unique properties. However, some challenges still remain luminescence design, performance improvement, application assignments. This review systematically summarizes the development of NIR LMHs through classifying origins into four major categories: band‐edge emission, self‐trapped exciton (STE) ion defect‐related emission. The mechanisms different types are discussed detail by analyzing typical examples. Reasonable strategies for designing optimizing luminescence/optoelectronic properties summarized, including bandgap engineering, self‐trapping state chemical composition modification, energy transfer, other auxiliary such as improvement synthesis scheme post‐processing. Furthermore, prospects based on devices revealed, phosphor‐converted light‐emitting diodes (LEDs), electroluminescent LEDs, photodetectors, solar cells, x‐ray scintillators, well demonstrations related practical applications. Finally, existing future perspectives LMH critically proposed. aims provide general understanding guidance design high‐performance materials. image

Language: Английский

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