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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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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Broadband and Multimode Near‐Infrared Emitter Based on Cr³⁺‐Activated Stannate for Multifunctional Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(7)

Published: Jan. 19, 2023

Abstract Broadband near‐infrared (NIR) phosphors have recently received considerable attention in spectroscopy technology fields, but designing inexpensive, emission peaks centered above 800 nm, and multimodal broadband NIR luminescence material still remains a great challenge. Here, by selecting stannate compound Mg 2 SnO 4 (MSO) as the host, kind of phosphor MSO:Cr 3+ with multimode properties is reported. The designed exhibits an peaking at nm full‐width half maximum 180 (≈2730 cm −1 ). site occupation Cr MSO unraveled density functional theory calculation. constructed light‐emitting device based on displays high output power 187.19 mW@100 mA remarkable photoelectric efficiency 13.67%, its multifunctional applications information encryption, non‐destructive detection, so are also demonstrated. Additionally, through defect reconstruction, presents superior persistent (PersL) PersL duration time longer than 50 h. This work provides feasible strategy to develop intelligent optical integrated low‐cost compounds host toward versatile such detection bioimaging.

Language: Английский

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Directly Identifying Multiple Cr³⁺ Emitting Centers for Broad Near‐Infrared Emission in an Efficient and Near‐Zero Thermal Quenching Garnet‐Type Phosphor

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(11)

Published: Feb. 8, 2024

Abstract Cr 3+ doped garnet‐type (A 3 B 2 C O 12 ) near‐infrared (NIR) phosphors is a desirable research hotspot due to their prospective night vision, bioimaging, and plant growth utilizations. Meanwhile, the origin of multisite broad emission yet controversial topic. To resolve trouble, verifying accurately multiple occupancy sites key. Furthermore, it an urgent need for improving external quantum efficiency luminescent thermostability. Herein, in Y Sc Al (YSAO), advanced electron microscopy technique employed directly confirm that obtained broadband NIR originates from [ScO 6 ] octahedral [YO 8 dodecahedral sites. The optimal YSAO:5%Cr sample exhibits high (IQE/EQE = 74/31%) near‐zero thermal quenching (97%@423 K 92%@473 K). theoretical calculations experimental proofs reveal YSAO possesses structural rigidity wide bandgap, which responsible extremely thermostable luminescence. high‐power ‐converted LED device shows promising multifunctional applications. This work not only provides efficient phosphor with quenching, but also effective determination method emitting centers materials.

Language: Английский

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MTiTaO₆: Cr³⁺ (M = Al³⁺, Ga³⁺, Sc³⁺) Phosphors with Ultra‐Broadband Excitation Spectra and Enhanced Near‐Infrared Emission for Solar Cells

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Achieving ultra‐broadband absorption and enhancing the near‐infrared (NIR) emitting properties of NIR phosphors is a key challenge to realize its multiple applications, such as solar spectrum conversion, spectral analysis, night vision. Here, novel phosphor system MTiTaO 6 : Cr 3+ ( M = Al , Ga Sc ), with an excitation broad 421 nm enhanced emission reported. It widest among known ‐doped phosphors. Structural spectroscopic analysis shows that originates from overlap luminescence centers. Additionally, peak red‐shifted 816 871 increasing ion radius, intensity enhanced, which not only makes spectra more compatible response curve c‐Si cells, but also gives it advantage in spectroscopy applications. Comparison water alcohol demonstrate promising

Language: Английский

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Near‐Unity Internal Quantum Efficiency and High Thermal Stability of Sr₃MgGe₅O₁₄: Cr³⁺ Phosphor for Plant Growth

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 8, 2025

Abstract Near‐infrared phosphor‐converted light‐emitting diodes (NIR pc‐LEDs) are regarded one of the most promising light sources for food analysis, plant growth, bioimaging, night vision, and so on. Cr 3+ ‐activated NIR phosphors have garnered increasing attention due to their exceptional photoluminescence properties pc‐LED. However, them suffer from poor thermal stability or low efficiency which limits large‐scale application. Herein, a novel Sr 3 MgGe 5 O 14 : (SMGO: ) phosphor is presented, exhibits broadband emission ranging range 650–1000 nm with peak at 735 nm. SMGO: 0.005Cr demonstrates an almost near‐unity internal quantum (99.4%) excellent quenching performance ( I 423 K /I 298 = 86%). First‐principles theory calculation indicates that ions preferentially occupy [Ge2/MgO 4 ] [Ge3O sites high doping concentration within SMGO host, illustrating mechanism. Furthermore, pc‐LED manufactured by utilizing 445 blue LED chip, output power 140.5 mW photoelectric conversion 15.5% 300 mA. Potential applications growth detection several mental also demonstrated, demostrates its application in growth.

Language: Английский

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Site-Selective Occupancy Control of Cr Ions toward Ultrabroad-Band Infrared Luminescence with a Spectral Width up to 419 nm

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(47), P. 53101 - 53110

Published: Nov. 17, 2022

Infrared-emitting phosphor-converted light-emitting diodes (LEDs) are desirable light sources for a very wide range of applications such as spectroscopy analysis, nondestructive monitoring, covert information identification, and night-vision surveillance. The most important aspect infrared emitters is to cover the widest possible wavelength emitted light. However, developing ultrabroad-band based on converter technology still challenging task due lack suitable phosphor materials that emit in upon excitation from blue-emitting chips. Herein, this work demonstrates Cr3+-activated Mg2SiO4 phosphors with super spectral 600 1400 nm high internal quantum yield up 80.4% 460 excitation. Site-selective occupancy Cr3+ two different Mg sites lattice results distinct broad emission bands peaking at 760 970 nm, both which contribute luminescence full width half maximum (FWHM) 419 nm. This by far broadest best our knowledge. On basis, an LED prototype has been fabricated combination Mg2SiO4:Cr3+ blue chip, shows great potential imaging sensing applications. site-selective control Cr ions effective strategy Cr3+-doped phosphors.

Language: Английский

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Simultaneous Absorption and Near‐Infrared Emission Enhancement of Cr³⁺ Ions in MgGa₂O₄ Spinel Oxide via Anionic F‐Substitution

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(5)

Published: Dec. 19, 2022

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are newly emerging broadband NIR light sources. However, the lack of high‐performance NIR‐emitting materials limits their popularization. Herein, an anionic F‐substitution strategy is presented to regulate absorption and emission MgGa 2 O 4 :Cr 3+ phosphors. Accordingly, enhancement as well redshift broadening achieved for F‐substituted (MGOF:Cr ) phosphors, simultaneously with high efficiency excellent thermal stability. Upon blue excitation, MGOF:0.02Cr phosphor exhibits a (650–1200 nm) peak wavelength (λ max 835 nm full width at half maximum ≈250 nm. Furthermore, has near‐unity internal quantum its intensity 150 °C maintains 94% initial value. A record external 60.6% further MGOF:0.08Cr redshifted λ 870 The Cr local structural alteration revealed account outstanding luminescence characteristics MGOF:Cr in view systematic characterization spectroscopic analysis. pc‐LED device good optical performance fabricated application semiconductor wafer inspection demonstrated. This study initiates new way design

Language: Английский

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