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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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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Emerging Fe³⁺ Doped Broad NIR‐Emitting Phosphor Ca_2.5Hf_2.5(Ga, Al)₃O₁₂: Fe³⁺ for LWUV Pumped NIR LED

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(5)

Published: Jan. 22, 2024

Abstract Fe 3+ is a promising dopant for designing near‐infrared (NIR) phosphors due to its broadband emitting, non‐toxic, and inexpensive properties. However, the 4 E ( D) + A 1 G) levels of ions are independent crystal‐field parameter, spectral regulation has become huge challenge. Herein, NIR‐emitting phosphor Ca 2.5 Hf (Ga, Al) 3 O 12 : successfully developed toward long‐wave ultraviolet (LWUV) light‐pumped NIR phosphor‐converted LED (pc‐LED). Significantly, excited transition reverse Ga can be realized by simply adjusting concentration, which results in largely enhanced excitation around 410 nm matches well with commercial LWUV LED. Moreover, exhibit emission centered at 770 optimized doping content 0.01 mol%, demonstrated ascribe occupying both octahedral 4+ tetrahedral sites. Further, simple cation modulation strategy proposed break lattice symmetry enhance NIR‐emission intensity 200% as much before. Finally, pc‐LED fabricated employing , Al coating on chip, shows great potential non‐destructive inspection applications.

Language: Английский

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Study on a Highly Thermostable Dy³⁺-Activated Borophosphate Phosphor

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(14), P. 6483 - 6492

Published: March 26, 2024

Constructing a phosphor with multifunctional applications is an imperative challenge. Especially, highly thermostable luminescence of indispensable for stable white-light-emitting diodes (LEDs). Nevertheless, good thermal quenching resistance behavior unfavorable fluorescence intensity ratio (FIR)-based optical temperature sensor. Herein, Ba3(ZnB5O10)PO4 (BZBP)-based successfully achieved via replacing Ba2+ Dy3+, demonstrating simultaneously promising lighting and thermometry utilizations. Under the excitation 350 nm, title only loses 12% initial when up to 473 K, ensuring sufficient thermostability white-LED lighting. The device fabricated using emits high-quality white light high color rendering index (Ra = 93) low correlated (CCT 3996 K). Meanwhile, yellow blue emission intensities demonstrate downtrend difference rising temperature. Temperature sensing properties are assessed through FIR technology. maximal relative sensitivity reaches as 0.0379 K–1 at 298 K. These results reveal that has great potential indoor applications.

Language: Английский

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How to Achieve Excellent Luminescence Properties of Cr Ion‐Doped Near‐Infrared Phosphors

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(24)

Published: Oct. 11, 2023

Abstract Transition metal chromium (Cr) ion‐doped inorganic materials exhibit distinct tunable broadband near‐infrared luminescence, and they have promising applications including nondestructive composition analysis, night vision, biomedicine, plant illumination, afterglow anticounterfeiting. Currently, the most critical issue is to optimize their full width at half maxima, thermal stability, internal/external quantum efficiency. This review systematically summarizes strategies effectively improve photoluminescence performance of near‐infrared‐emitting with transition ions. Key examples design preparation Cr luminescence different modes, a detailed discussion properties luminescent materials, summary generic help explore novel efficient Cr‐doped phosphor are provided. Next, latest developments trends in these presented for variety application scenarios. Finally, future research directions new challenges faced also discussed.

Language: Английский

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Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

The Journal of Physical Chemistry Letters, Journal Year: 2023, Volume and Issue: 14(6), P. 1371 - 1378

Published: Feb. 2, 2023

The rising demand for portable near-infrared (NIR) light sources has accelerated the exploration of NIR luminescent materials with high efficiency and excellent thermal stability. Inspired by structural-modulated ion substitution strategy, herein, a high-performance Cs2KIn0.8Al0.1F6:0.1Cr3+ phosphor peak at 794 nm full width half-maximum (fwhm) 117 was successfully synthesized introducing Al3+ ions. performance is reflected in its internal quantum (IQE) 88.06% good quenching resistance (I423K = 71.64%). Compared initial Cs2KInF6:0.1Cr3+, IQE stability are improved 16.67% 72.54%, which stem from enhanced crystallinity strengthened structural rigidity. Finally, phosphor-converted light-emitting diode (pc-LED) superior photoelectric (21.04%@320 mA) fabricated. Meanwhile, pupil tracking, anticounterfeiting, intelligent identification, bioimaging were demonstrated. This work provides new perspectives synthesizing efficient fluoride phosphors designing diverse applications.

Language: Английский

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Screening of Broadband Near-Infrared Cr³⁺-Activated Phosphors Using Ce³⁺ as a Probe

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(5), P. 2038 - 2046

Published: Feb. 24, 2023

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are ideal miniaturized NIR light sources, but it is still difficult to find broadband-emitting phosphors due the lack of appropriate material design principles. In this work, we propose a method hosts yielding broadband Cr3+ emission by screening Ce3+-doped phosphor for which both Ce3+ and can occupy same crystallographic site. A Ba3Sc4O9:Cr3+ (BSO:Cr3+) with an peak at 835 nm full width half-maximum (FWHM) 188 obtained, where or accommodated Sc3+ The BSO:Cr3+ ceramic demonstrated produce emitter output power 14.56 mW when driven blue laser diode 5.0 V/100 mA. By following proposed method, two composed Li3Sc2(PO4)3:Cr3+ (λem = 1000 nm, FWHM 223 nm) Na3Sc2(PO4)3:Cr3+ 895 184 further discovered.

Language: Английский

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Highly Efficient and Thermally Stable Broadband NIR Phosphors with Superlong Afterglow Performance and their Multifunctional Applications

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)

Published: May 16, 2024

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are considered as promising next‐generation light sources for optoelectronic and biomedical applications. Nevertheless, NIR phosphors with large bandwidths, long emission peaks, high external quantum efficiencies (EQEs) valuable thermal stabilities challenging to develop. Herein, this study reports a novel gallium germanate host, Ga 3 Al Ge 2 O 13 (GAGO), bandgap rigid host lattice Cr 3+ ion doping. The blue LED excitable GAGO:0.012Cr phosphor can produce broadband maximum intensity at 816 nm full‐width half‐maximum (FWHM) of 187 nm. Notably, the also exhibits an excellent EQE 35.8% perfect stability (I 423 K /I 298 = 67.4%). Moreover, attractive afterglow duration more than 24 h is achieved in GAGO:0.004Cr phosphor. type origin traps discussed, possible persistent luminescent (LPL) mechanism proposed. Finally, pc‐LED based on fabricated. results demonstrate that obtained show great potential use night vision, nondestructive detection, bioimaging information encryption. This provides new insight into development materials efficiency, good extraordinary performance.

Language: Английский

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Transformation of refractory ceramic MgAl2O4 into blue light emitting nanomaterials by Sr2+/Cr3+ activation

Materials Science and Engineering B, Journal Year: 2024, Volume and Issue: 303, P. 117273 - 117273

Published: Feb. 26, 2024

Language: Английский

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