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

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(46), P. 63831 - 63839

Published: Nov. 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.

Language: 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, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 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.

Language: Английский

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Er3+ activated BaLaGaO4 multifunctional green phosphors for optical thermometers and WLEDs

Journal of Rare Earths, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 1, 2024

Language: Английский

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Thermal enhanced upconversion luminescent of Sc2W3O12:Yb3+/Er3+ for optical temperature measurement

Ceramics International, Journal Year: 2024, Volume and Issue: 50(21), P. 44704 - 44710

Published: Aug. 28, 2024

Language: Английский

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Tuning Optical Properties of Sustainable Inorganic Bismuth-Based Perovskite Materials with Organic Ligands

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1321, P. 140183 - 140183

Published: Sept. 26, 2024

Language: Английский

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