Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(11)

Published: Aug. 7, 2022

Abstract Cr 3+ /Cr 4+ ‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, so on. Plenty of excellent NIR are developed by introducing ion various inorganic hosts. Herein, the effect crystal field on luminescence combining Tanabe–Sugano energy level diagram configuration coordinate model is discussed. Research progress ‐doped materials, including phosphors designed from structural models with octahedral, tetrahedral, other coordination types, then outlined. The properties more than 200 kinds summarized. In particular, several strategies for tuning wavelength, broadening band, enhancing efficiency, improving thermal stability, listed. Finally, current challenges future prospects research presented. This review will contribute a deeper understanding not only mechanism but also chromium‐doped as develop better performance explore applications.

Language: Английский

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Simultaneous Broadening and Enhancement of Cr³⁺Photoluminescence in LiIn₂SbO₆by Chemical Unit Cosubstitution: Night‐Vision and Near‐Infrared Spectroscopy Detection Applications

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(26), P. 14644 - 14649

Published: April 6, 2021

Abstract Near‐infrared (NIR)‐emitting phosphor materials have been extensively developed for optoelectronic and biomedical applications. Although Cr 3+ ‐activated phosphors widely reported, it is challenging to achieve ultra‐broad tunable NIR emission. Here, a new ultra‐broadband NIR‐emitting LiIn 2 SbO 6 :Cr with emission peak at 965 nm full‐width half maximum of 217 reported. Controllable tuning from 892 achieved by chemical unit cosubstitution [Zn 2+ –Zn ] [Li + –In ], which can be ascribed the upshift 4 T 2g energy level due strengthened crystal field. Moreover, greatly enhanced, FWHM reaches 235 nm. The as‐prepared luminescent demonstrated potential in night‐vision spectroscopy techniques. This work proves feasibility strategy ‐doped phosphors, stimulate further studies on emission‐tunable materials.

Language: Английский

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Advances in solution-processed near-infrared light-emitting diodes

Nature Photonics, Journal Year: 2021, Volume and Issue: 15(9), P. 656 - 669

Published: Aug. 27, 2021

Language: Английский

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A highly efficient and suitable spectral profile Cr3+-doped garnet near-infrared emitting phosphor for regulating photomorphogenesis of plants

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 428, P. 132003 - 132003

Published: Aug. 25, 2021

Language: Английский

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Trivalent Chromium Ions Doped Fluorides with Both Broad Emission Bandwidth and Excellent Luminescence Thermal Stability

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(15), P. 18274 - 18282

Published: April 8, 2021

Recently, trivalent chromium ion doped phosphors have exhibited significant application potential in broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs). However, developing an NIR phosphor with both broad emission bandwidth and excellent luminescence thermal stability is still a great challenge. Here, we demonstrate phosphor, ScF3:Cr3+, which can fulfill conditions simultaneously. The prepared show the range of 700 to 1100 nm, full width at half-maximum (FWHM) 140 nm peaking 853 nm. These also (the intensity ScF3:Cr3+ keeps 85.5% 150 °C compared value room temperature). An pc-LED based on blue LED chips was fabricated tested. results that yield strong emission. This work not only provides promising for pc-LEDs but has important guiding significance effect synthesis properties Cr3+-doped fluorides.

Language: Английский

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Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: May 13, 2022

Abstract The growing demand for spectroscopy applications in the areas of agriculture, retail and healthcare has led to extensive research on infrared light sources. ability phosphors absorb blue from commercial LED convert excitation energy into long-wavelength luminescence is crucial design cost-effective high-performance phosphor-converted LEDs. However, lack ideal blue-pumped short-wave (SWIR) with an emission peak longer than 900 nm greatly limits development SWIR LEDs using converter technology. Here we have developed a series SWIR-emitting materials high efficiency excellent thermal stability by co-doping Cr 3+ -Yb ion pairs Lu 0.2 Sc 0.8 BO 3 host materials. Benefitting strong absorption waveband very efficient →Yb transfer, as-synthesized :Cr ,Yb phosphor emits intense 900–1200 Yb under at ~460 nm. optimized presents internal quantum yield 73.6% intensity 100 °C can still keep 88.4% starting value 25 °C. prototype device based exhibits exceptional performance, delivering radiant power 18.4 mW 9.3% blue-to-SWIR conversion 5.0% electricity-to-SWIR 120 mA driving current. Moreover, illumination high-power LED, covert information identification night vision lighting been realized, demonstrating bright prospect practical applications.

Language: Английский

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A highly efficient and thermally stable broadband Cr³⁺-activated double borate phosphor for near-infrared light-emitting diodes

Journal of Materials Chemistry C, Journal Year: 2020, Volume and Issue: 9(1), P. 164 - 172

Published: Nov. 10, 2020

GdAl₃(BO₃)₄:Cr³⁺is used to fabricate a NIR-pc-LED that shows promise for plant lighting and applications in the nondestructive analysis of agricultural products.

Language: Английский

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Two-site Cr³⁺ occupation in the MgTa₂O₆:Cr³⁺ phosphor toward broad-band near-infrared emission for vessel visualization

Journal of Materials Chemistry C, Journal Year: 2020, Volume and Issue: 8(27), P. 9322 - 9328

Published: Jan. 1, 2020

Cr³⁺ ions in MgTa₂O₆ located the two six-coordinated crystallographic sites of Mg²⁺ and Ta⁵⁺ enable broad-band near-infrared emission.

Language: Английский

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Broadband near-infrared phosphor BaMgAl10O17:Cr3+ realized by crystallographic site engineering

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 417, P. 129224 - 129224

Published: March 7, 2021

Language: Английский

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Structural Confinement for Cr³⁺ Activators toward Efficient Near-Infrared Phosphors with Suppressed Concentration Quenching

Chemistry of Materials, Journal Year: 2021, Volume and Issue: 33(10), P. 3621 - 3630

Published: May 4, 2021

Trivalent chromium ion-doped near-infrared (NIR) phosphors have been widely studied due to their tunable emission wavelengths and broad applications. High Cr3+ concentration can improve absorption efficiency but generally results in low intensity the quenching effect. Herein, we report a series of efficient NIR with suppressed quenching, Sr9M1–x(PO4)7:xCr3+ (M = Ga, Sc, In, Lu), showing broadband ranging from 700 1100 nm peaking at 850 upon 485 light excitation. The peak position is almost independent type M ion dopant content, has little influence on luminescence thermal indicating that [MO6] octahedra are rigid enough keep octahedral volumes average M3+–O2– distances nearly constant owing formation framework structure substitution. intensities monotonously increase content increasing 0 80% Sr9Cr(PO4)7 still maintains 84.23% Sr9Ga0.2(PO4)7:0.8Cr3+ phosphor, behavior slightly dependent x; these effects be attributed energy transfer structural confinement optimal sample, Sr9Ga0.2(PO4)7:0.8Cr3+, an internal/external quantum 66.3%/29.9%. Finally, fabricate phosphor-conversion light-emitting diode demonstrate its applications nondestructive examination medical fields.

Language: Английский

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