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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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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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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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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Broadband Near-Infrared Luminescence in Garnet Y₃Ga₃MgSiO₁₂: Cr³⁺ Phosphors

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(10), P. 4220 - 4226

Published: March 1, 2023

Broadband near-infrared (NIR) phosphors are the critical component of phosphor converted NIR light-emitting diode (LED) light sources. However, there still a lack with excellent external quantum efficiency (EQE) and thermal stability. Here, we report highly efficient broadband Y3Ga3MgSiO12: Cr3+. The optimized yields an internal (IQE) EQE 79.9 33.7%, respectively. integrated emission intensity remains at 84.4% that room temperature when heated to 423 K. A LED lamp was made by combining as-prepared blue InGaN chip, which shows output power 89.8 mW photoelectric conversion 17.1% driven 525 input power. Our research provides promising high for source.

Language: Английский

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Efficient and Stable Gd₃Ga₅O₁₂:Cr³⁺ Phosphors for High‐Performance NIR LEDs

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(21)

Published: June 7, 2023

Abstract Cr 3+ ‐activated Gd 3 Ga 5 O 12 garnet (GGG:Cr ) near‐infrared (NIR) phosphors have shown promising applications in regulating plant growth. However, the low external quantum efficiency (EQE) results a wall‐plug (WPE) of phosphor‐converted light‐emitting diodes (pc)‐LEDs only ≈15%. Herein, an easy strategy to improve luminescent properties GGG:Cr phosphor is reported. Through optimization synthesized technology, EQE enhanced 43.6%. Remarkably, fabricated pc‐LEDs achieve WPE as high 34.3%. These demonstrate significant advancement development and NIR materials pc‐LED devices.

Language: Английский

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High Output Power and High Quantum Efficiency in Novel NIR Phosphor MgAlGa_0.7B_0.3O₄:Cr³⁺ with Profound FWHM Variation

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(9)

Published: Nov. 8, 2023

Abstract There is strong demand for ultraefficient near‐infrared (NIR) phosphors with adjustable emission properties next‐generation intelligent NIR light sources. Designing large full‐width at half‐maximum (FWHM) variations challenging. In this study, novel near‐ultraviolet light‐emitting diode (LED)‐excited phosphors, MgAlGa 0.7 B 0.3 O 4 :Cr 3+ (MAGBO:Cr ), three centers achieve ultra‐narrowband (FWHM = 29 nm) to ultra‐broadband 260 increasing Cr concentration. Gaussian fitting and decay time analysis reveal the alteration in FWHM, which attributed energy transfer occurring between centers. The distinct thermal quenching behaviors of are revealed through temperature‐dependent times. phosphor MAGBO:0.05Cr exhibits high stability (85%, 425 K) exceptional external quantum efficiency 68.5%. An phosphor‐converted LED (pc‐LED) fabricated using phosphor, exhibiting a remarkable output power 136 mW 600 mA pc‐LEDs. This study describes preparation highly efficient provides further understanding tunable vital high‐performance versatile applications.

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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Improving and broadening luminescence in Gd_2−xAl_xGaSbO₇:Cr³⁺ phosphors for NIR LED applications

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 10(7), P. 2197 - 2205

Published: Jan. 1, 2023

Enhanced and broadened NIR luminescence was realized in a Gd 2− x Al GaSbO 7 :Cr 3+ phosphor by → cation substitution. Its application as an emitting converter for LEDs confirmed.

Language: Английский

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