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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Modulation of Thermally Stable Photoluminescence in Cr³⁺-Based Near-Infrared Phosphors

The Journal of Physical Chemistry Letters, Journal Year: 2022, Volume and Issue: 13(22), P. 5001 - 5008

Published: June 1, 2022

Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for various photonics applications, while developing thermally stable NIR phosphors remains a great challenge. Increasing the temperature accelerates severe nonradiative relaxation process gorverned by intrinsic energy gap law, which further suspends efficient low-energy emission of Cr3+ emitters in inorganic lattice. To address this rule, several state-of-the-art strategies have been put forward perspective to modulate critical law from viewpoints (1) crystal structure design, (2) defect engineering, (3) strengthened rigidity, and (4) transfer. This suggests avenues exploring novel broadband with high thermal stability will also stimulate studies spectroscopy high-power applications.

Language: Английский

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Highly Efficient Broadband Near-Infrared Luminescence with Zero-Thermal-Quenching in Garnet Y₃In₂Ga₃O₁₂:Cr³⁺ Phosphors

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(18), P. 8418 - 8426

Published: Sept. 15, 2022

Broadband near-infrared (NIR) light source based on phosphor-converted light-emitting-diode (pc-LED) is crucial for applications in medical diagnosis, food quality analysis, and night vision fields, motivating the development of highly efficient thermal robust NIR phosphor materials. Herein, a novel Cr3+-doped garnet Y3In2Ga3O12:Cr3+ emerges from fundamental study Ln3In2Ga3O12 (Ln = La, Gd, Y, Lu) family. Upon 450 nm excitation, this material presents broadband emission covering 650–1100 with peak located at 760 full width half maximum 125 nm. This also possesses an ultrahigh internal quantum efficiency (IQE 91.6%) absorption (AE 46.6%), resulting external as high 42.7%. Moreover, intensity 150 °C maintains 100% initial intensity, showing rare zero-thermal-quenching property. Fabricating pc-LED device by using material, excellent output power 68.4 mW photoelectric 15.9% under mA driving current can be obtained, which exhibits much better performance than devices fabricated some reported Therefore, work not only provides ultraefficient thermally spectroscopy application but contributes to foundation design rules materials performance.

Language: Английский

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Bright Green Emission from Self-Trapped Excitons Triggered by Sb³⁺ Doping in Rb₄CdCl₆

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(12), P. 5717 - 5725

Published: June 10, 2022

Sb3+ with stereochemically active lone pair 5s2 electrons is overwhelming in the doping engineering of luminescent metal halides, and it usually leads to extrinsic self-trapped excitons (STEs) tunable emissions. However, photoluminescence enhancement mechanism doped halides compared pristine host remains unclear. Herein, we into all-inorganic non-emissive Rb4CdCl6, realizing bright green emission peaking at 525 nm a quantum yield 70.2%. A comparison Raman spectra, as well Debye temperature, was utilized elucidate STEs mechanism, verifying that softens structural lattice. Thus, strong electron–phonon interactions enable highly efficient originating from Rb4CdCl6:Sb3+. This work demonstrates solid evidence emissions can be triggered by doping, design principle involved will guide future studies for emerging luminescence material exploration.

Language: Английский

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Achieving High Quantum Efficiency Broadband NIR Mg₄Ta₂O₉:Cr³⁺ Phosphor Through Lithium‐Ion Compensation

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(22)

Published: March 3, 2023

Ultra-efficient broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are urgently needed to improve the detection sensitivity and spatial resolution of current smart NIR spectroscopy-based techniques. Nonetheless, performance pc-LED has severely limited owing external quantum efficiency (EQE) bottleneck materials. Herein, a blue LED excitable Cr3+ -doped tetramagnesium ditantalate (Mg4 Ta2 O9 , MT) phosphor is advantageously modified through lithium ion as key efficient emitter achieve high optical output power light source. The emission spectrum encompasses 700-1300 nm electromagnetic first biological window (λmax = 842 nm) with full-width at half-maximum (FWHM) ≈2280 cm-1 (≈167 nm), achieves record EQE 61.25% detected 450 excitation Li-ion compensation. A prototype fabricated MT:Cr3+ Li+ evaluate its potential practical application, which reveals an 53.22 mW driving 100 mA, photoelectric conversion 25.09% 10 mA. This work provides ultra-efficient luminescent material, shows great promise in applications presents novel option for next-generation high-power compact sources.

Language: Английский

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Broadband NIR Phosphor Ca₂LuScAl₂Si₂O₁₂:Cr³⁺ for NIR LED Applications

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 10(24)

Published: Oct. 26, 2022

Abstract Near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) have promising applications in food analysis, night vision imaging, and biological probes. Developing NIR phosphors with broadband emission high efficiency has attracted immense interest. Herein, a novel phosphor Ca 2 LuScAl Si O 12 :Cr 3+ (CLSAS:Cr ) is reported for the first time. Under excitation of 442 nm light, CLSAS:Cr shows from 600 to 900 full width at half maximum (FWHM) 142 nm, benefiting emissions two Cr centers CLSAS, which proved by spectra decay curves. The internal quantum (IQE) 73.7% achieved and, 423 K, intensity maintains 76% value room temperature. Combining 450 blue chip, pc‐LED fabricated demonstrated fast imaging veins human palm fist, as well objects.

Language: Английский

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Ab Initio Site‐Selective Occupancy and Luminescence Enhancement in Broadband NIR Emitting Phosphor Mg₇Ga₂GeO₁₂:Cr³⁺

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(7)

Published: March 15, 2023

Abstract Cr 3+ activated near‐infrared (NIR) phosphors are getting unprecedented attention to fabricate the broad band NIR light emitting diodes (NIR‐LEDs) for nondestructive detection, bio‐imaging, and night vision. However, it remains a major challenge obtain ultrabroadband phosphor with excellent quantum yield (QY). Here, broadband Mg 7 Ga 2 GeO 12 :Cr (MGGO: ) ranging from 600 1300 nm an outstanding QY (93%) large full width of half maximum (FWHM = 226 nm) is developed, in which site occupancy tendency MGGO host discussed detail through combining structure optimization first‐principles theory calculation luminescent properties at low temperature. After that, emission intensity MGGO:Cr improved partial substitution 2+ by alkaline‐earth ions Ca , Sr or Ba luminescence enhancement mechanism also investigated. Furthermore, pc‐LED device fabricated 450 blue LED chip brightest /Ba its potential applications evaluated field vision, bio‐imaging.

Language: Английский

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Laser-driven broadband near-infrared light source with watt-level output

Nature Photonics, Journal Year: 2024, Volume and Issue: 18(6), P. 562 - 568

Published: March 1, 2024

Language: Английский

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Valence conversion and site reconstruction in near-infrared-emitting chromium-activated garnet for simultaneous enhancement of quantum efficiency and thermal stability

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: Oct. 7, 2023

Achievement of high photoluminescence quantum efficiency and thermal stability is challenging for near-infrared (NIR)-emitting phosphors. Here, we designed a "kill two birds with one stone" strategy to simultaneously improve the NIR-emitting Ca3Y2-2x(ZnZr)xGe3O12:Cr garnet system by chemical unit cosubstitution, revealed universal structure-property relationship luminescence optimization mechanism. The cosubstitution [Zn2+-Zr4+] [Y3+-Y3+] played critical role as reductant promote valence transformation from Cr4+ Cr3+, resulting reconstruction octahedral sites Cr3+. introduction also contributed rigid crystal structure. These aspects together realized internal 96% excellent 89%@423 K. Moreover, information encryption "burning after reading" was achieved based on different resistance phosphors acid. developed phosphor-converted light-emitting diode demonstrated promising applications in bio-tissue imaging night vision. This work provides new perspective developing high-performance phosphor materials.

Language: Английский

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