Fe3+-activated BaZrO3 with broadband NIR-II phosphor for large-area Illumination, non-visual and biomedical imaging

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 161473 - 161473

Опубликована: Март 1, 2025

Язык: Английский

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Cr³⁺-Doped LiAlO₂ NIR-I Emitting Phosphors with Superior Resistance to Thermal Quenching for Night Vision Monitoring and Bioimaging

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(44), С. 60599 - 60607

Опубликована: Окт. 22, 2024

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) as a new NIR light source has outstanding application potential in the fields of spectroscopy analysis, sensing, imaging, and pattern recognition. Therefore, development phosphors with good luminescence thermal stability attracted much attention. To this end, we developed LiAlO2:Cr3+ garnet-type by high-temperature solid-state reaction method. Under 405 nm excitation, Cr3+ ions located tetrahedrons LiAlO2 emit emission broadband that covers 650-900 mixed several sharp narrowband R-line emissions, which showed excellent integrated intensity measured at 573 K is ∼90.86% 303 caused structural rigidity low expansion coefficient matrix material. An pc-LED device assembled optimized commercially available purple LED chip emitted output power ∼98.172 mW driving current 300 mA demonstrated an electro-optical conversion efficiency ∼9.09%, while it night vision monitoring biomedical imaging.

Язык: Английский

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Antithermal-Quenching Near-Infrared Emitting Lu₂SrAl₄SiO₁₂:Cr³⁺ Garnet-Type Phosphor for High-Resolution Nonvisual Imaging

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(46), С. 63831 - 63839

Опубликована: Ноя. 12, 2024

Near-infrared (NIR) light allows fast and nondestructive detection with deep penetration into biological tissues is widely used in food inspection, biomedical imaging, night vision security, other fields. Cr3+-doped NIR first region (NIR-I) phosphors have many interesting features that attracted a lot of attention recently. However, practical issues, such as low photoluminescence quantum efficiency poor thermal stability, need to be addressed. We synthesized Lu2SrAl4SiO12 garnet-type using high-temperature solid-state reaction method. Under blue-light (@ 430 nm) excitation, the exhibited broadband NIR-I emission range 600–1000 nm, an peak at 710 nm. This system unique, had multipeak sharp-line superposition Cr3+ ions were situated relatively strong crystal field environment, opposed weak environment for matrix. The optimal doping content was 2 mol %, its internal ∼76.8%. Surprisingly, this phosphor showed antithermal quenching effect, integrated luminescence intensity measured 573 K 206.3% 303 K. found caused by extremely expansion coefficient rigid structure matrix temperature range, well weakening electron–phonon coupling increasing temperature. optimized packaged blue chip phosphor-converted light-emitting diode device. source device output power 119.02 mW electro-optical conversion 11.02% under driving current 300 mA. application potential demonstrated high-resolution imaging.

Язык: Английский

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Efficient Ba2NaNb5O15:Cr3+,Yb3+ nanocrystals embedded transparent glass-ceramics toward night-vision application

Ceramics International, Год журнала: 2025, Номер unknown

Опубликована: Май 1, 2025

Язык: Английский

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Near-Infrared Luminescence of Cr³⁺-Doped Ba₂NaNb₅O₁₅ Embedded in Transparent Glass-Ceramics as Solid-State Illumination for Night-Vision Imaging

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(19), С. 28366 - 28373

Опубликована: Май 6, 2025

Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs), a widely used NIR light source, are typically prepared by sealing the phosphor powder and an LED chip with epoxy resin. One issue that pc-LEDs frequently encounter is aging deterioration of resin over time, which leads to self-absorption sharp decline in emission efficiency. Here, we report synthesis chemically stable luminescent material composed Cr3+-doped Ba2NaNb5O15 nanocrystals measuring 10-15 nm, Cr3+ ions located octahedral centers nanocrystals. Under 460 nm excitation, transparent glass-ceramic exhibited broadband range 600-1400 originated from electronic transition excited state 4T2 ground 4A2. The peak was at ∼810 FWHM ∼230 internal quantum efficiency reached ∼0.81%. We constructed pc-LED device using optimized NIR-emitting glass-ceramics commercially available blue chip, demonstrating its promising application night-vision lighting. Our study provides basis for preparation glass-ceramic-based devices as improved alternative solid-state illumination.

Язык: Английский

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Orthoboric Acid as Sintering Flux Improved Emission Efficiency and Thermal Stability of Ni2+-doped SrTiO3 Perovskite NIR-II Phosphor

Ceramics International, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Язык: Английский

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Ultrabroad Short-Wave Infrared Emission Enabled by Chemical Unit Cosubstitution of Ni²⁺ in Fluoride K₂LiCrF₆:Ni²⁺ for Infrared Spectroscopy Applications

ACS Materials Letters, Год журнала: 2025, Номер unknown, С. 2010 - 2016

Опубликована: Апрель 25, 2025

Язык: Английский

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Fe³⁺/Yb³⁺ Co‐Activated MgGa₂O₄ Phosphor as Widely Near‐Infrared Lighting for Night‐Vision, Non‐Destructive Imaging, and Plant Cultivation

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Abstract Fe 3+ as an activator for Near‐infrared (NIR) phosphors has the advantages over Cr and Ni 2+ due to its abundant resource, low cost, nontoxic, eco‐friendly features, making it a luminescence candidate with huge commercial potential. However, most reported ‐activated have relatively narrow NIR emission of 600–950 nm may limit their applications. Here, new strategy is expand bandwidth by co‐doping Yb in MgGa 2 O 4 phosphor exhibited broadband that covering nm, attributed transition : T 1 (4G)→ 6 A (6S), sharp band 950–1100 F 5/2 → 7/2 , which extended range nearly ≈ 150 compared phosphor, while energy transfer between demonstrated. It internal quantum efficiency 48.9%, thermal stability measured intensity at 423 K 69.57% 293 K. An pc‐LED device prepared lighting source night‐vision, non‐destructive imaging, plant cultivation are This study provides extend wavelength nontoxic phosphors.

Язык: Английский

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A Nontoxic and Environmentally Friendly NIR‐II Phosphor for Night Vision, Bio‐Imaging, Large‐Scale Detection, and Information Anti‐Counterfeiting with High‐Resolution Imaging

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 21, 2025

Abstract Near‐infrared second region (NIR‐II, 1000–1600 nm) has deeper penetration depth, higher sensitivity, and spatial resolution than NIR first (NIR‐I, 700–1000 nm). However, Cr 3+ Ni 2+ ‐doped NIR‐I/NIR‐II phosphor with serious pollution toxicity issues pose limitations for the application of these phosphors. Here, Fe Cs 2 NaLuCl 6 is reported by grinding‐sintering method, which shows broadband emission in range nm a FWHM ≈309 nm, while PLQY as 17.29%, under 395 excitation. The unique this originates from activation center located an environment extremely weak octahedral crystal field provided lattice. A pc‐LED device assembled optimal encapsulated commercially available ultraviolet LED chip. Which output 23.5 mW electro‐optical conversion efficiency 6.53% 100 mA driving current, potential demonstrated night vision, bio‐imaging, large‐scale detection, information anti‐counterfeiting high‐resolution imaging.

Язык: Английский

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