An efficient and thermally stable source with Cr3+ near-infrared luminescence for non-destructive testing applications

Materials Today Chemistry, Journal Year: 2024, Volume and Issue: 35, P. 101918 - 101918

Published: Jan. 1, 2024

Language: Английский

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Highly‐Efficiency Far‐Red Emission in Cr³⁺ Activated Ca_1.8Mg_1.2Al₂Ge₃O₁₂ toward Plant Precise Lighting

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)

Published: Feb. 25, 2024

Abstract Far‐red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high‐performance Cr 3+ ‐doped FR phosphors. This study developed phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr (CMAGG: ), using the cation substitution strategy. Under 438 nm blue light excitation, phosphors display emission centered at 720 with full width half maximum (FWHM) of 91 nm. Benefit from favorable match phytochrome (P fr phosphor is combined InGaN chips create phosphor‐converted light‐emitting diode (pc‐LED), which used in Italian lettuce growth experiments and results shown 15% increase fresh weight 6.5% dry weight. Notably, supplemental modulated its morphology. The this will be useful further research on novel meet precise spectral requirements growth.

Language: Английский

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Highly thermally stable SrLaMgTaO6: Cr3+ double-perovskite phosphors for night-vision applications

Ceramics International, Journal Year: 2024, Volume and Issue: 50(16), P. 28707 - 28714

Published: May 12, 2024

Language: Английский

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Highly Efficient and Thermally Stable NIR‐Emitting Phosphor with Largely Tunable Peak Wavelength and Bandwidth Toward NIR Spectroscopy Applications

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

Published: Feb. 21, 2025

Abstract Developing tunable broadband near‐infrared (NIR) fluorescent materials with outstanding luminescence properties and superior thermal robustness remains a significant challenge for next‐generation intelligent NIR light sources. Herein, high‐performance large‐scale NIR‐emitting garnet‐type phosphor, SrLu 2 Al 3 ScSiO 12 :Cr 3+ (SLASSO:Cr ), is presented. Upon 450 nm blue excitation, SLASSO:1%Cr phosphor yields emission full width at half maximum of 108 prominent sharp peak 694 superimposed on radiation, which attributed to the co‐occupation Cr ions dominant [AlO 6 ] octahedral site (Cr1 site) subordinate [ScO (Cr2 site). Remarkably, as ⁺ content increases, red‐shift in wavelength spanning from 785 bandwidth broadening 89 152 are observed, stems weakening crystal field strength energy redistribution within Cr1 Cr2 centers regulated by formation local ‐Cr ion pairs. Notably, optimal sample boasts an excellent internal quantum efficiency 89.4% exceptional stability (97.6%@423 K). Additionally, fabricated phosphor‐converted light‐emitting diode devices demonstrate promising multi‐functional applications, including plant cultivation, night vision, bioimaging non‐destructive detection.

Language: Английский

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Chromium Cluster Luminescence: Advancing Near‐Infrared Light‐Emitting Diode Design for Next‐Generation Broadband Compact Light Sources

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(13)

Published: Dec. 16, 2023

Abstract In modern technology devices, an energy‐saving miniature near‐infrared (NIR) light source plays a critical role in non‐destructive, non‐invasive sensing applications and further advancement of technology. This paper reports the broadband NIR luminescence Cr 3+ clusters for designing phosphor‐converted light‐emitting diodes as alternative to typical isolated centers ion pairs. Here, form intermediate spinel structure MgGa 2 O 4 by utilizing long‐chain edge‐shared octahedral dimers with shortest bond distance between cations. Electron paramagnetic magnetometry measurements confirm clusters, resulting three distinct emission centers. The formation ensures stable internal quantum efficiency (≈94%), full‐width‐half‐maximum (248 nm), thermal stability (87%), radiant flux ≈17.66 mW. work offers promising approach phosphor design enhances understanding mechanisms related structures.

Language: Английский

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Shortwave Infrared Luminescence of Tetravalent Chromium and Divalent Nickel: Phosphor Design Principles and Applications

ACS Applied Optical Materials, Journal Year: 2023, Volume and Issue: 1(6), P. 1063 - 1079

Published: Jan. 27, 2023

Shortwave infrared radiations (SWIR, 900–1700 nm) emitting inorganic luminescent materials are key components for multiple applications, which range from optical communication and anticounterfeiting purposes to chemical medical diagnosis. The blue light excitable SWIR phosphors activated with the transition metal ions Cr4+/Ni2+ considered prospective sources an upcoming compact modern device using phosphor converter technology. In this review, crystal field theory Tanabe-Sugano diagram briefly discussed understand splitting of energy levels concurrent effect. Several possible strategies achieve enhance luminescence efficiency emission disclosed as is reported system. Finally, domains potential practical application introduced. This review will provide information on recent advances mechanism Cr4+/Ni2+-activated also assist researchers in developing next-generation exploring new applications.

Language: Английский

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Towards ultra-sensitive multimodal luminescent thermometers enabled by high crystal field strength of Lu₂CaMg₂Ge₃O₁₂:Yb³⁺,Nd³⁺,Er³⁺ phosphors

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

An effective full-spectrum thermometer covering from the visible to NIR-II band was designed based on garnet Lu 2 CaMg Ge 3 O 12 :Yb 3+ ,Er /Nd phosphors; meanwhile, Er ( 4 I 13/2 ) split into four Stark sublevels due high crystal field strength.

Language: Английский

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Crystallographic Engineering to Develop Ultra‐Narrow‐Band Cyan‐Emitting UCr₄C₄‐Type Phosphor for Healthy LED Lighting and Display

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(11)

Published: June 18, 2024

Abstract Narrow‐band cyan‐emitting materials for white light‐emitting diode (wLED) application have shown great potential in increasing the maximum accessible display gamut and improving color rendering of full‐spectrum healthy lighting. However, discovery novel narrow‐band cyan emitters with excellent luminescence performances remains challenging. Here, an ultra‐narrow‐band Na 5 K 3 (Li SiO 4 ) 8 :Eu 2+ (N phosphor (λ em = 483 nm) full width at half (FWHM) only 18 nm is developed from some typical UCr C frameworks phosphors by slightly modifying crystal structure symmetry. Through controllable regulation ratio 6 2 to N , lattice sites forming shoulder peaks are further squeezed generate narrowest emission. Moreover, exhibits low photoluminescence thermal quenching (90%@150 °C) high internal quantum efficiency (IQE) 50%. The index wLED health lighting enhanced 92 94. Using this short‐wavelength emission instead a part blue chip can effectively prevent “blue hazard”. This work provides basic principles design phosphors, thus achieving their applications fields eye‐friendly display.

Language: Английский

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Crystal Field-Engineered Cr³⁺-Doped Gd₃(Mg_xGa_5–2xGe_x)O₁₂ Phosphors for Near-Infrared LEDs and X-ray Imaging Applications

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(28), P. 12886 - 12893

Published: July 1, 2024

Inorganic materials doped with chromium (Cr) ions generate remarkable and adjustable broadband near-infrared (NIR) light, offering promising applications in the fields of imaging night vision technology. However, achieving high efficiency thermal stability these NIR phosphors poses a significant challenge for their practical application. Here, we employ crystal field engineering to modulate characteristics Cr3+-doped Gd3Ga5O12 (GGG). The Gd3MgxGa5–2xGexO12 (GMGG):7.5% Cr3+ (x = 0, 0.05, 0.15, 0.20, 0.40) emission are developed through cosubstitution Mg2+ Ge4+ Ga3+ sites. This strategy also effectively reduces strength around ions, which results enhancement photoluminescence (PL) full width at half-maximum (fwhm) from 97 165 nm, alongside red shift PL peak an intensity up 2.3 times. Notably, behaviors is improved. demonstrate potential biological tissue penetration vision, as well exceptional scintillation performance scintillator imaging. research paves new perspective on development high-performance technology light-emitting diodes (LEDs) X-ray applications.

Language: Английский

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Widened and enhanced near-infrared luminescence of Y2-Sc GaSbO7:Cr3+ phosphors

Journal of Alloys and Compounds, Journal Year: 2023, Volume and Issue: 956, P. 170377 - 170377

Published: May 1, 2023

Language: Английский

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