Tailoring the Cr³⁺ Emission via Combinatorial Management of Crystal‐Field and Energy Transfer for Multiple NIR LEDs

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(16)

Published: March 1, 2024

Abstract Near‐infrared (NIR) phosphors converted light‐emitting diodes (NIR pc‐LEDs) are ideal NIR sources for versatile applications, which imply the practical significance in tailoring emission of to enhance performance specific application. Herein, a paradigm emissions series Cr 3+ ‐doped match applications lighting, detection, and short‐wave infrared through combinatorial management crystal‐field energy transfer is presented. The band largely increases from 84 190 nm when introduction [MgO6]‐[GeO4] into Y 3 Ga 5 O 12 :0.08Cr forms Mg x 5‐2 Ge substitution [GaO6]‐[GaO4]. Such large increase width makes it suitable near‐infrared lighting detection. Moreover, Yb , Nd Er doped construct with broadening region enhanced thermal stability. An optimized dominates :0.4Cr ,Yb phosphor has excellent stability (129%@423 K) high‐power sources. presented work not only provides well‐performed phosphors, but lights up avenue designing

Language: Английский

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Broadband Near-Infrared Luminescence from Mo⁴⁺ in Zero-Dimensional Perovskite Cs₂Zr(Cl,Br)₆ with an Exceptionally High Quantum Efficiency and Thermal Stability

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(2), P. 901 - 910

Published: Jan. 9, 2024

Broadband near-infrared (NIR) luminescent materials hold the key to next-generation, smart, NIR light sources. The emerging halide perovskite are regarded as promising candidates for optoelectronics because of their superior optical properties and easy solution processability. However, it remains a major challenge realize efficient thermally stable broadband luminescence in these materials. Herein, we report novel strategy achieve by utilizing transitions from lowest 1T2 level Mo4+ components its 3T1 ground state soft Cs2Zr(Cl,Br)6 lattice. multiple transitions, each occurring within (4d2) t22 crystal-field configuration containing zero-phonon vibronic contributions, superimpose on other generate emission. emission spectrum encompasses long wavelength region 800 1400 nm centered at 970 with full width half-maximum 170 nm. More importantly, title phosphor shows an exceptional quantum efficiency (66.9%) thermal stability (67%@150 °C). as-fabricated phosphor-converted light-emitting diode great potential lighting source. This research opens new horizon realizing high-performance exploiting electronic activators

Language: Английский

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Interstitial Oxygen-Driven Far-Red/Near-Infrared Emission and Efficiency Enhancement via Heterovalent Cation Substitution in Ca₃WO₆ Phosphors

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

In this work, Ca3WO6 (CWO) phosphors were successfully synthesized using a high-temperature solid-state method, exhibiting an anomalous far-red/near-infrared (FR-NIR) emission centered at 685 nm. The origin of FR-NIR is confirmed through Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), density functional theory (DFT) calculations, and heterovalent cationic substitution (Y3+/Na+ → Ca2+). These analyses indicate that interstitial oxygen (Oi) defects within the lattice are primarily responsible for emission. Y3+ Ca2+ increases concentration Oi, significantly enhancing intensity. This results in increase internal quantum efficiency (IQE) increasing from 12.8 to 90.9%, realizing efficient self-activated phosphors. Furthermore, CWO demonstrate unique dual-band characterized by blue 435 nm endows with multifunctional applications plant growth lighting, nondestructive testing, night vision fields.

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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A novel broadband near-infrared phosphor NaBaScSi2O7: Fe3+ and its application in pc-LED and night vision

Science China Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Language: Английский

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