Sr2AlTaO6: Ni2+ phosphors with excellent IQE and thermal stability as NIR-II source for night vision, nonvisual detection, and far-field imaging

Chemical Engineering Journal, Год журнала: 2025, Номер 505, С. 159559 - 159559

Опубликована: Янв. 13, 2025

Язык: Английский

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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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Designing Polychromatic Luminescence in Mn²⁺-Doped Cs₂NaLuCl₆ Double Perovskite Crystals via Energy Transfer Engineering for Optical Thermometry and X-ray Imaging

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Фев. 2, 2025

Metal halide double perovskites with splendid optical features have been considerably investigated for optoelectronic applications. Herein, a series of Mn2+-doped Cs2NaLuCl6 perovskite crystals were prepared. Via adopting the density functional theory calculation, effect Mn2+ doping on electronic structure compound was discussed. It found that crystal can emit intense blue light from host self-trapped exciton (STE) emission. Excited by 320 nm, STE and emissions simultaneously observed in resulting crystals. Owing to efficient energy transfer Mn2+, polychromatic luminescence final products. Moreover, taking advantage various responses emission intensities temperature, thermometric characteristics investigated, their maximum relative sensitivity is 0.99% K-1, which hardly impacted content. Furthermore, prepared exhibit good X-ray radioluminescence properties, low detection limitation 0.99 μGyair s-1. Additionally, utilizing designed crystal, flexible imaging high resolution 20 lp mm-1 be operated high-temperature environment realized. These results indicated are suitable thermometry 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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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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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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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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Advanced Anticounterfeiting Technologies Leveraging High-Efficiency Visible to Near-Infrared Luminescent Lead-Free Double Perovskites

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Май 24, 2025

With the rapid development of markets and economies, various brands have raised higher demands for optical anticounterfeiting technology. Lead-free halide double perovskites with broadband self-trapped exciton emission excellent properties such as good visibility, diverse colors, simple designs, making them outstanding materials information encryption applications. In this study, we successfully synthesized lead-free dual centers by doping Sb3+ Cr3+ into Cs2NaScCl6. The blue (445 nm) originates from [SbCl6]3- octahedra, while near-infrared (980 comes luminescence ions. achieved a quantum efficiency up to 71% through efficient energy transfer among multiple centers. Finally, patterns were realized screen printing samples. research results provide inspiration designing tunable luminescent properties.

Язык: Английский

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Engineering Broadband Emission of Zn₂Ga_0.5‐yAl_ySb_0.5O₄∶Cr³⁺ Phosphors for Near‐Infrared LED Application

Small, Год журнала: 2025, Номер unknown

Опубликована: Май 5, 2025

Abstract In phosphor‐converted light‐emitting diode (pc‐LED)‐based near‐infrared light sources for biochemical analysis and medical diagnostics, phosphors with broadband (NIR) emission play an important role, obtaining such is a great challenge. Herein, efficient NIR‐emitting Zn 2 Ga 0.5‐y Al y Sb 0.5 O 4 :Cr 3+ are developed by introducing to gradually replace in the host through crystal engineering. Spectral densitometric calculations show that this homogeneous cation substitution strategy optimizes local lattice environment significantly suppresses nonradiative relaxation of Cr centers, thus exhibiting strong NIR properties. addition, ions varied low‐temperature emissions notable temperature sensitivity differences among centers. At 90 K, material achieves maximum relative 1.45% K −1 , highlighting its potential as thermosensitive applications sensing. The LED source fabricated based on shows significant response different liquids transmission spectral analysis, suggesting identification organic compounds.

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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