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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Broadband Shortwave Infrared-Emitting Cr³⁺- and Ni²⁺-Codoped Y₃Al₂Ga₃O₁₂ Phosphor with Excellent Thermal Stability for Multifunctional Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1509 - 1521

Published: Dec. 20, 2024

Shortwave infrared (SWIR)-emitting materials have emerged as superior light sources with increasing demand for potential applications in noninvasive analysis, night vision illumination, and medical diagnosis. For developing next-generation SWIR phosphor-converted light-emitting diodes (pc-LEDs), the scarcity of intense blue-light-pumped broadband luminescent poor thermal stability current Ni2+-activated phosphors are ongoing challenges. Here, a blue-light-excitable (440 nm) Y3Al2Ga3O12:Cr3+,Ni2+ phosphor ultrawide emission centered at ∼1430 nm (FWHM ∼264 is reported. The efficient Cr3+ → Ni2+ energy transfer exploited remarkable enhancement 18-fold under blue-light excitation. Significantly, excellent (90% 440 K) band obtained codoped which best among reported phosphors. Besides, experimental techniques (XANES EXAFS) density functional theory calculations employed to investigate local structure propose [GaO6] octahedrons favorable occupation sites Ni2+/Cr3+ ions. A pc-LED fabricated using blue chip proof concept invisible illumination technology, nondestructive spectroscopic anticounterfeiting, imaging applications. This work offers effective insights into transfer-assisted presents thermally robust Cr3+-Ni2+-codoped designing future mini-SWIR pc-LEDs spectroscopy

Language: Английский

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Fabrication of a Phosphor‐in‐Silica Glass Spectral Converter via Injection Molding for Stable and High‐Power Broadband LEDs

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Abstract The encapsulation of phosphor particles into a silica glass (PiSG) matrix leads to the formation an efficient and chemically durable spectral converter, which is promising candidate for fabrication stable high‐power phosphor‐converted white light‐emitting‐diodes (pc‐wLEDs). Here, high‐throughput transparent PiSG converters based on Y 3 Al 5 O 12 :Ce 3+ , Mg 2 4 Si 18 :Eu 2+ :Cr demonstrated via injection molding followed by pressureless sintering. as‐fabricated exhibits broadband emission covering visible near‐infrared (vis‐NIR) regions (i.e., 500–900 nm) with high‐luminescence efficiency (> 85%) high‐chemical thermal stabilities, retaining more than 90% its intensity at 200 °C. Consequently, pc‐vis‐NIR‐LEDs (10 W) are manufactured using molded converters, showed excellent luminescence performance luminous (LE) = 115 Im W −1 correlated‐color‐temperature (CCT) 4531 K, color‐rendering‐index (R ) 90.1 50 mA input power 0.45 W). This work enables LEDs low cost outstanding optical properties, making spectral‐converter favorable device lighting bioimaging applications.

Language: Английский

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Luminescence Investigation of Red Phosphors La3Ga5SnO14:Eu3+ with High Color Purity and Application in w-LEDs

Journal of Fluorescence, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Language: Английский

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Preparation and luminescent properties of chromium ion doped aluminum borate near-infrared phosphor (Al18B4O33: Cr3+) and its application of broadband near-infrared LED

Ceramics International, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

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High Quantum Efficiency and Zero‐Thermal‐Quenching Blue‐Light‐Excited Near‐Infrared‐Emitting Y₃Ga₅O₁₂:Cr³⁺/Ni²⁺ Phosphors

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 19, 2025

Abstract Near‐infrared (NIR) phosphors that exhibit high quantum efficiency and excellent thermostability are of critical importance for the development NIR light‐emitting diodes (LEDs) with substantial output power. In this work, Cr 3+ ‐Ni 2+ codoping Y 3 Ga 5 O 12 (YGAO) a internal (IQE), external (EQE), notable thermal stability prepared via solid‐state reactions. When excited by blue light at 437 nm, YGAO:Cr /Ni demonstrate broad intense emission spanning 600–1100 nm 1200–1650 nm. YGAO:3%Cr /0.01%Ni an IQE 96.9% EQE 37.5%, whereas YGAO:6%Cr have 76.2% 36.3%. The luminescence intensities ions 423 K show zero quenching in compared to those 303 K, which is attributed enhancement effect caused electron population between energy levels trap‐supplemented luminescence. LED based on has maximum power 197.79 mW under 1000 mA operating current. Furthermore, also promising potential detection functional groups, night vision, penetration.

Language: Английский

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Synthesis and Luminescence Characterization of Novel Red-Emitting Phosphors Based on Eu3+-Activated K2Sr(MoO4)2 Molybdates for w-LEDs

Journal of Fluorescence, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 7, 2024

Language: Английский

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