Producing Tunable Broadband Near-Infrared Emission through Co-Substitution in (Ga_1–xMg_x)(Ga_1–xGe_x)O₃:Cr³⁺

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(45), P. 51157 - 51164

Published: Nov. 7, 2022

Broadband near-infrared (NIR) phosphors are in high demand for creating "smart" NIR phosphor-converted light-emitting diode (pc-LED) sources. In this work, a series of Cr3+-substituted NIR-emitting materials with highly efficient, broad, tunable emission spectra achieved by modifying the simple oxide Ga2O3 using [Mg2+-Ge4+] and [Ga3+-Ga3+] co-unit substitution. The results show that peak can be shifted from 726 to 830 nm while maintaining constant excitation blue light region, enabling extensive application. optical properties stem changes Cr3+ crystal field environment upon Intriguingly, temperature-dependent photoluminescence position shows virtually no change co-substituted materials. This abnormal phenomenon is found comprehensive embodiment weakening (red-shift) as temperature increases reduced local structure distortion (blue-shift) increasing temperature. quantum yield, emission, net-zero shift function make phosphor class optimal device incorporation. As result, their performance was studied coating on 450 emitting LED chip. fabricated demonstrates an excellent output power photoelectric conversion efficiency. study provides tunable, broadband spectroscopy applications contributes basic foundation Cr3+-activated phosphors.

Language: Английский

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Highly efficient and thermally stable broadband NIR phosphors by rationally bridging Cr³⁺–Yb³⁺ in LiScGe₂O₆ for optical bioimaging

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 10(3), P. 860 - 868

Published: Dec. 9, 2022

A broadband NIR phosphor covering the 750–1200 nm region with high luminescence efficiency and good thermal stability was realized by energy transfer of Cr 3+ → Yb .

Language: Английский

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Ultra‐Wide Vis–NIR Mg₂Al₄Si₅O₁₈:Eu²⁺,Cr³⁺ Phosphor Containing Unusual NIR Luminescence Induced by Cr³⁺ Occupying Tetrahedral Coordination for Hyperspectral Imaging

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 10(19)

Published: July 14, 2022

Abstract Cr 3+ ‐activated broadband near‐infrared (NIR) phosphors, featured by the octahedral coordination preference and strong absorption in visible (Vis) region, have great potential application nondestructive assessment. It is still a challenge to develop ‐doped phosphors with tetrahedrally coordinated NIR emission behavior ultra‐wide Vis–NIR luminescence. Herein, an unusual NIR‐emitting Mg 2 Al 4 Si 5 O 18 :Cr phosphor offers peak at 867 nm full‐width half‐maximum of 237 due preferential occupation AlO tetrahedra as demonstrated structural optical properties studies. Eu 2+ –Cr energy transfer proposed induce :Eu ,Cr more efficient lower thermal quenching . The fabricated phosphor‐converted light‐emitting diode expected be alternative halogen lamp hyperspectral imaging. This work reveals luminescence demonstrates imaging, which will facilitate further research on phosphors.

Language: Английский

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NIR Mechanoluminescence from Cr³⁺ Activated Y₃Al₅O₁₂ with Intense Zero Phonon line

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(27)

Published: May 1, 2023

Abstract Mechanoluminescence (ML) materials with long‐wavelength emission bands are essential for future in vivo bioimaging, non‐destructive testing of solids, etc. The lack a defined mechanism, however, prevents the application near infrared ML above 650 nm several new fields. Here, addition Ga 3+ ions to Y 3 Al 5 O 12 : Cr manipulates matrix microstructure evolution, boosting near‐infrared (NIR) zero‐phonon line (ZPL) stress optical output ion at 688 nm. key factor changing crystal field intensity D q /B due is what causes luminescence amplification ZPL. fabricated by composite polydimethylsiloxane and 4 GaO (YAGG: ) may penetrate chicken feet epidermal tissue mm pork thanks strong NIR ZPL YAGG: phosphor. This discovery enhancing solid solution provides us technique optimizing materials, as well prospect biological applications.

Language: Английский

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Consequence of optimal bonding on cation ordering and enhanced near-infrared luminescence in Cr³⁺-doped pyroxene oxides

Journal of Materials Chemistry C, Journal Year: 2022, Volume and Issue: 10(24), P. 9232 - 9240

Published: Jan. 1, 2022

The intermediate compositions in Ge-based pyroxene solid-solutions, (Mg 1- y Li )(Mg Sc )Ge 2 O 6 :4%Cr 3+ ( = 0–1), are better phosphor hosts for Cr , possessing higher internal quantum efficiency and thermal luminescence stability.

Language: Английский

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