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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Simultaneous Broadening and Enhancement of Cr³⁺Photoluminescence in LiIn₂SbO₆by Chemical Unit Cosubstitution: Night‐Vision and Near‐Infrared Spectroscopy Detection Applications

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(26), P. 14644 - 14649

Published: April 6, 2021

Abstract Near‐infrared (NIR)‐emitting phosphor materials have been extensively developed for optoelectronic and biomedical applications. Although Cr 3+ ‐activated phosphors widely reported, it is challenging to achieve ultra‐broad tunable NIR emission. Here, a new ultra‐broadband NIR‐emitting LiIn 2 SbO 6 :Cr with emission peak at 965 nm full‐width half maximum of 217 reported. Controllable tuning from 892 achieved by chemical unit cosubstitution [Zn 2+ –Zn ] [Li + –In ], which can be ascribed the upshift 4 T 2g energy level due strengthened crystal field. Moreover, greatly enhanced, FWHM reaches 235 nm. The as‐prepared luminescent demonstrated potential in night‐vision spectroscopy techniques. This work proves feasibility strategy ‐doped phosphors, stimulate further studies on emission‐tunable materials.

Language: Английский

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Trivalent Chromium Ions Doped Fluorides with Both Broad Emission Bandwidth and Excellent Luminescence Thermal Stability

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(15), P. 18274 - 18282

Published: April 8, 2021

Recently, trivalent chromium ion doped phosphors have exhibited significant application potential in broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs). However, developing an NIR phosphor with both broad emission bandwidth and excellent luminescence thermal stability is still a great challenge. Here, we demonstrate phosphor, ScF3:Cr3+, which can fulfill conditions simultaneously. The prepared show the range of 700 to 1100 nm, full width at half-maximum (FWHM) 140 nm peaking 853 nm. These also (the intensity ScF3:Cr3+ keeps 85.5% 150 °C compared value room temperature). An pc-LED based on blue LED chips was fabricated tested. results that yield strong emission. This work not only provides promising for pc-LEDs but has important guiding significance effect synthesis properties Cr3+-doped fluorides.

Language: Английский

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A highly efficient and suitable spectral profile Cr3+-doped garnet near-infrared emitting phosphor for regulating photomorphogenesis of plants

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 428, P. 132003 - 132003

Published: Aug. 25, 2021

Language: Английский

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A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(36)

Published: June 24, 2021

Abstract The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources emerging applications. Herein, a series hexafluorides A 2 BMF 6 :Cr 3+ (A = Na, K, Rb, Cs; B Li, M Al, Ga, Sc, In) peaking at ≈733–801 nm with full width half maximum (FWHM) ≈98–115 are synthesized by general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation trivalent metal sources, Cr can be more efficiently doped into simultaneously prevent generation competitive phase. Particularly, Na 3 ScF (λ em 774 nm, FWHM ≈ 108 nm) optimal ‐doping concentration 35.96% shows high internal quantum efficiency 91.5% an external ≈40.82%. emitting diode (LED) device output power ≈291.05 mW 100 mA driven current photoelectric conversion 20.94% fabricated. strategy opens up new avenues exploration ‐doped phosphors, as‐obtained record demonstrates LED

Language: Английский

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Highly efficient Fe3+-doped A2BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: April 27, 2022

Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr3+-activated NIR-emitting phosphors, next-generation Cr3+-free phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of luminescent materials different application fields. Here, we report Fe3+-activated Sr2-yCay(InSb)1-zSn2zO6 that exhibit unprecedented long-wavelength emission. The overall emission tuning from 885 1005 nm broadened full-width at half maximum 108 146 was realized through a crystallographic site engineering strategy. significantly enhanced after complete Ca2+ incorporation owing substitution-induced lower symmetry Fe3+ sites. Ca2InSbO6:Fe3+ phosphor peaking 935 showed an ultra-high internal quantum 87%. as-synthesized emission-tunable demonstrated great potential spectroscopy detection. This work initiates development efficient broadband opens up new avenue designing materials.

Language: Английский

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Ultra-Broadband and high efficiency Near-Infrared Gd3Zn Ga5-2Ge O12:Cr3+ (x = 0–2.0) garnet phosphors via crystal field engineering

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 437, P. 135346 - 135346

Published: Feb. 19, 2022

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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Efficient and Tunable Luminescence in Ga_2–xIn_xO₃:Cr³⁺ for Near-Infrared Imaging

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(27), P. 31835 - 31842

Published: June 29, 2021

Broadband near-infrared (NIR) emitting materials are in great demand as next-generation smart NIR light sources. In this work, a Cr3+-substituted phosphor capable of efficiently converting visible to is developed through the solid solution, Ga2–xInxO3:Cr3+ (0 ≤ x 0.5). The compounds were prepared using high-temperature solid-state synthesis, and crystal electronic structure, morphology, site preference, photoluminescence properties studied. results demonstrate high quantum yield (88%) impressive absorption efficiency (50%) when = 0.4. emission tunable across wide range (713–820 nm) depending on value x. Moreover, fabricating prototype phosphor-converted light-emitting diode (LED) device 450 nm LED [(Ga1.57Cr0.03)In0.4]O3 showed an output power that reached 40.4 mW with photoelectric conversion 25% driven by current 60 mA, while resulting was able identify damaged produce undetectable light. These outstanding potential for imaging applications.

Language: Английский

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Tuning luminescence from NIR-I to NIR-II in Cr³⁺-doped olivine phosphors for nondestructive analysis

Journal of Materials Chemistry C, Journal Year: 2021, Volume and Issue: 9(16), P. 5469 - 5477

Published: Jan. 1, 2021

We report a series of Cr³⁺-doped olivine phosphors with tunable luminescence from 940 to 1100 nm. They have promising applications in the field food processing for both qualitative identification and quantitative analysis.

Language: Английский

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