Journal of Luminescence, Journal Year: 2025, Volume and Issue: 283, P. 121275 - 121275
Published: April 23, 2025
Language: Английский
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
Citations
293
Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)
Published: July 25, 2023
The increasing demand for high-contrast biological imaging, non-destructive testing, and infrared night vision can be addressed by the development of high-performance NIR light-emitting materials. Unlike lanthanide (Ln3+) with sharp-line multiplets isolated Cr3+ NIR-I emission, this study reports first-ever NIR-II broadband luminescence based on intervalence charge transfer (IVCT) Cr3+-Cr3+ aggregation in gallate magentoplumbite. In particular, LaMgGa11O19:0.7Cr3+ exhibits dual-emission (NIR-I, 890 nm NIR-II, 1200 nm) a full width at half maximum (FWHM) 626 under 450 blue LED excitation. Moreover, anti-thermal quenching behavior (432% @ 290 K), attributed to energy among multiple centers. Cryogen absorption spectra, lifetimes decay (2.3 ms), electron paramagnetic experiments reveal → Cr2+-Cr4+ IVCT transition. application imaging as an optical contrast agent, is demonstrated. This work provides new insights into UV-NIR excitation aggregation.
Language: Английский
Citations
74
The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(9), P. 2319 - 2324
Published: Feb. 22, 2024
Cr3+ doped near-infrared phosphors hold significant applications and generate considerable research interest. The critical parameter for assessing the strength of crystal field in Tanabe–Sugano diagram is boundary value Dq/B, representing ratio splitting to Racah B. Nevertheless, there are conflicting values this parameter, as reported various studies, such 2.1, 2.2, 2.3 C/B = 4.5–4.8. Moreover, some with wide-band emissions exhibit a Dq/B that falls within region contradictory strong field. In study, we numerically determine which distinguishes between weak fields. results then demonstrate dependence on host material correlated parameters B C. This work resolves inconsistency emission profile Cr3+, providing researchers more profound comprehension luminescence.
Language: Английский
Citations
33
Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)
Published: May 16, 2024
Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are considered as promising next‐generation light sources for optoelectronic and biomedical applications. Nevertheless, NIR phosphors with large bandwidths, long emission peaks, high external quantum efficiencies (EQEs) valuable thermal stabilities challenging to develop. Herein, this study reports a novel gallium germanate host, Ga 3 Al Ge 2 O 13 (GAGO), bandgap rigid host lattice Cr 3+ ion doping. The blue LED excitable GAGO:0.012Cr phosphor can produce broadband maximum intensity at 816 nm full‐width half‐maximum (FWHM) of 187 nm. Notably, the also exhibits an excellent EQE 35.8% perfect stability (I 423 K /I 298 = 67.4%). Moreover, attractive afterglow duration more than 24 h is achieved in GAGO:0.004Cr phosphor. type origin traps discussed, possible persistent luminescent (LPL) mechanism proposed. Finally, pc‐LED based on fabricated. results demonstrate that obtained show great potential use night vision, nondestructive detection, bioimaging information encryption. This provides new insight into development materials efficiency, good extraordinary performance.
Language: Английский
Citations
17
Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(24)
Published: Oct. 11, 2023
Abstract Transition metal chromium (Cr) ion‐doped inorganic materials exhibit distinct tunable broadband near‐infrared luminescence, and they have promising applications including nondestructive composition analysis, night vision, biomedicine, plant illumination, afterglow anticounterfeiting. Currently, the most critical issue is to optimize their full width at half maxima, thermal stability, internal/external quantum efficiency. This review systematically summarizes strategies effectively improve photoluminescence performance of near‐infrared‐emitting with transition ions. Key examples design preparation Cr luminescence different modes, a detailed discussion properties luminescent materials, summary generic help explore novel efficient Cr‐doped phosphor are provided. Next, latest developments trends in these presented for variety application scenarios. Finally, future research directions new challenges faced also discussed.
Language: Английский
Citations
41
Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(5), P. 2038 - 2046
Published: Feb. 24, 2023
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are ideal miniaturized NIR light sources, but it is still difficult to find broadband-emitting phosphors due the lack of appropriate material design principles. In this work, we propose a method hosts yielding broadband Cr3+ emission by screening Ce3+-doped phosphor for which both Ce3+ and can occupy same crystallographic site. A Ba3Sc4O9:Cr3+ (BSO:Cr3+) with an peak at 835 nm full width half-maximum (FWHM) 188 obtained, where or accommodated Sc3+ The BSO:Cr3+ ceramic demonstrated produce emitter output power 14.56 mW when driven blue laser diode 5.0 V/100 mA. By following proposed method, two composed Li3Sc2(PO4)3:Cr3+ (λem = 1000 nm, FWHM 223 nm) Na3Sc2(PO4)3:Cr3+ 895 184 further discovered.
Language: Английский
Citations
26
Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(9)
Published: May 9, 2023
Abstract Broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes are next‐generation smart NIR light sources. However, the phosphor suffers from serious thermal quenching (TQ), resulting in efficiency reduction and spectral shift. Here, a novel strategy is realized to suppress TQ by minimizing bond angle distortion, completely different conventional suppression approach through length variation. Li(Sr 1− x Ca )AlF 6 :Cr 3+ taken as an example which rotation between two parallel fluorine planes perpendicular C 3 axis [AlF ] octahedron found dominate TQ. Increasing 0 1 reduces amplitude of 16.17° 5.06°, weakening electron–phonon coupling and, consequently, raising temperature significantly 320 570 K. This mechanism elucidated both theoretical calculations spectroscopic studies. The findings open new horizon for exploration thermally stable phosphors.
Language: Английский
Citations
24
Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(4)
Published: Aug. 31, 2023
Abstract Near‐infrared (NIR) phosphors are enablers for NIR phosphor‐converted light‐emitting diodes (pc‐LEDs). However, fewer NIR‐emitting with both high internal/external quantum efficiency (IQE/EQE) and thermal stability discovered, which obstructs the promotion of pc‐LEDs. Herein, by partially replacing Al 3+ in K‐β‐Al 2 O 3 :2Cr Ga , photoluminescence (PL) intensity solid solution K 1+δ (Al 0.4 0.6 ) 11 17 (KA G O:Cr) phosphor is increased 2.75 1.25 times that end‐members (KAO:Cr) (KGO:Cr). The IQE/EQE optimal KA O:Cr reaches 88.9%/50.8% (77.4%@150 °C). PL enhancement due to Al/Ga‐6O octahedral volume distortion variation caused substitution 1‐y ,Ga y O:Cr), leads forbidden d–d transition being broken crystal field strength varied. Finally, a pc‐LED device fabricated based on blue chip an electro‐optical 16.3% under drive current 100 mA. Meanwhile, non‐destructive detection plant germination applications demonstrated. These results prove promising diverse applications.
Language: Английский
Citations
23
Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(8), P. 2814 - 2823
Published: Jan. 1, 2024
The double luminescence centers of the Y 2 Mg Al Si O 12 :Cr 3+ phosphor are accurately analyzed by a site elimination strategy.
Language: Английский
Citations
15
Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)
Published: Feb. 25, 2024
Abstract Far‐red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high‐performance Cr 3+ ‐doped FR phosphors. This study developed phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr (CMAGG: ), using the cation substitution strategy. Under 438 nm blue light excitation, phosphors display emission centered at 720 with full width half maximum (FWHM) of 91 nm. Benefit from favorable match phytochrome (P fr phosphor is combined InGaN chips create phosphor‐converted light‐emitting diode (pc‐LED), which used in Italian lettuce growth experiments and results shown 15% increase fresh weight 6.5% dry weight. Notably, supplemental modulated its morphology. The this will be useful further research on novel meet precise spectral requirements growth.
Language: Английский
Citations
11