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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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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Super Broadband Emission Across NIR‐I and NIR‐II Under Blue Light Excitation of Cr³⁺, Ni²⁺ Co‐Doped Sr₂GaTaO₆ Phosphor Achieved by Two‐Site Occupation and Effective Energy Transfer

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(8)

Published: March 20, 2024

Abstract The performance of the near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) mainly depends on NIR emitting phosphors used. Cr 3+ doped materials can be excited by blue light chips, but their emission is located in NIR‐I region (650–1000 nm). Ni 2+ are NIR‐II (1000–1700 nm), they cannot effectively chips. Herein, , mono‐doped, and co‐doped Sr 2 GaTaO 6 prepared investigated. ions occupy two octahedral sites Ga Ta 5+ . co‐doping has achieved breakthroughs. One to shift optimal excitation wavelength from violet due energy transfer (efficiency up 70%) other achieve broadband continuous across regions (650–1700 nm, with a full width at half maximum (FWHM) 410 nm (173 + 237 nm)). : 0.02Cr 0.01Ni phosphor combined commercial 460 chip realize its application organic compounds identification, night vision, biological imaging. This work points out direction for future development efficient super NIR‐emitting phosphors.

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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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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Developing the Na₂CaZr₂Ge₃O₁₂:Cr³⁺ Garnet Phosphor for Advanced NIR pc-LEDs in Night Vision and Bioimaging

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(9), P. 4654 - 4663

Published: May 1, 2024

Materials emitting near-infrared (NIR) light play a crucial role in the development of phosphor-converted light-emitting diodes (pc-LEDs) for applications ranging from fundamental science like spectroscopic analysis to highly applied uses night vision and biological imaging. One class materials that has garnered significant interest these technical spaces is Cr3+-activated garnets due their high efficiency ability operate at relatively temperatures. However, limited emission beyond 800 nm impedes use as optimal blue LED-pumped NIR-emitting materials. In this study, we present new garnet-type NIR phosphor, Na2CaZr2Ge3O12:Cr3+, addresses challenge─the material exhibits long-wavelength (λem,max = 832 nm) good thermal quenching resistance while maintaining an excellent internal quantum (IQE 98%). These properties are attributed crystal environment reconstruction, where structure distortion coupled weak field, which uncommon most rigid phosphors. Furthermore, fabricated pc-LED devices using demonstrate superior performance compared with employing well-known efficient phosphors operating range. The source subsequently demonstrated spanning vision, bioimaging, nondestructive analysis. This study not only provides insights into luminescence garnet desirable but also highlights practical application

Language: Английский

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Exploring innovative applications of Sr2MgSi2O7:Fe3+ luminescent system in surface-triggered fingerprint divergence and cheiloscopy screening

Materials Today Sustainability, Journal Year: 2024, Volume and Issue: 26, P. 100788 - 100788

Published: May 1, 2024

Language: Английский

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Blueshift and Photoluminescence Enhancement in Broadband Near‐Infrared Emitting Phosphor NaSr₂(Al/Ga)Ge₅O₁₄: Cr³⁺ Dependence on the Sc/In Substitution

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(13)

Published: Jan. 26, 2024

Abstract Cr 3+ ‐activated near‐infrared (NIR) phosphors have gained extensive attention for use in NIR phosphor‐converted light‐emitting diodes (pc‐LEDs), which are required smart spectroscopy techniques. Nevertheless, obtaining broadband NIR‐emitting with outstanding thermal stabilities and photoluminescence (PL) efficiencies remains a significant challenge. Herein, considering NaSr 2 XGe 5 O 14 (X = Al, Ga, Sc, In) as hosts, possess large band gap multiple sites the substitution of ions. :Cr successfully prepared using solid‐state reaction technology. Upon blue light excitation, cover broad emission 650–1100 nm region. Notably, an abnormal blueshift PL enhancement observed following Al/Ga Sc/In. In particular, internal quantum efficiency is improved from 34.5% (NaSr GaGe : ) to 87.5% ScGe ). Moreover, manufactured pc‐LED exhibited exceptional photoelectric 17.7% output power 10.2 mW at 20 mA, its potential application nondestructive detection demonstrated.

Language: Английский

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Ultra‐Broadband Green‐Emitting Phosphors without Cyan Gap Based on Double‐Heterovalent Substitution Strategy for Full‐Spectrum WLED Lighting

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(12)

Published: Aug. 26, 2022

Abstract Phosphor‐converted white light‐emitting diodes (WLEDs) are extensively spread to every part of our daily life and trigger urgent needs for discovery phosphors without cyan gap (spectral missing in the 480–520 nm range) pursuit “human‐centric” sunlight‐like full‐spectrum lighting. Here, a new ultra‐broadband green‐emitting K 3 La(PO 4 ) 2 :Eu 2+ phosphor is reported meet this challenge. An efficient positive double‐heterovalent substitution strategy proved La(Ca/Sr/Ba)(PO by evidence enhanced quantum yield, improved thermal stability, tunable luminescence color. The mechanisms revealed paper. Fabricating dichromatic 370 nm‐UV chip pumped WLED using La(Ca)(PO along with commercially available red shows continuity spectrum comparable solar excellent CIE color coordinates (0.350, 0.347), low color‐correlated temperature 4853 K, high rendering index (Ra) 96. It shown that contributes designing optimizing WLEDs.

Language: Английский

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