Super Broadband Near‐Infrared Solid Solution Phosphors with Adjustable Peak Wavelengths from 1165 to 875 nm for NIR Spectroscopy Applications

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(5)

Published: Dec. 20, 2022

Abstract Cr 3+ ‐activated near‐infrared (NIR) phosphors have attracted wide attention owing to applications in phosphor‐converted light‐emitting diodes (pc‐LED) for spectroscopy. Because a broader spectrum covers more information detect, the width of is an important parameter consider. Here, blue LED excitable ultra‐broadband LiInGeO 4 phosphors, which exhibit unprecedented long‐wavelength NIR emission with full‐width at half maximum (FWHM) 305 nm, are developed. The overall tuning from 1165 875 nm broadened FWHM 508 realized through designing continuous solid solution hosts LiIn 1− z Sc GeO /(LiIn) y Mg 2 and finite (LiIn) Zn :Cr . observation such not 4+ studied confirmed by electron paramagnetic resonance, X‐ray absorption near‐edge structure, steady‐/transient‐state photoluminescence. formation solutions induces change local structure that ultimately leads super broadband (FWHM = nm) luminescence. luminescence mechanism discussed this study. Finally, study demonstrates as‐synthesized tunable can be well used pc‐LEDs spectroscopy detection.

Language: Английский

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An Efficient Perovskite‐Like Phosphor with Peak Emission Wavelength at 850 nm for High‐Performance NIR LEDs

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(4)

Published: Dec. 16, 2022

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are an emerging light source demanded for the miniaturization of NIR spectroscopy. However, photoelectric efficiency and spectral properties pc‐LEDs still very limited due to a lack efficient broadband phosphors with peak emission wavelength >850 nm. Here, novel Cr 3+ ‐activated perovskite‐like Mg 4 Ta 2 O 9 phosphor is reported, which exhibits broad band peaking at 850 nm high internal (external) quantum 72% (33.4%). The fabricated pc‐LED shows covering whole 700–1100 spectrum range conversion 22.1% 10 mA. This work may provide new paradigm discovery singly doped excellent performance.

Language: Английский

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A novel efficient broadband near-infrared phosphor LiGaGe₂O₆:Cr³⁺ with EQE enhancement and spectral tuning by Sc³⁺–Ga³⁺ substitution for NIR pc-LED application

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 10(2), P. 511 - 521

Published: Nov. 18, 2022

High-efficint LiGaGe 2 O 6 :Cr 3+ NIR phosphor is explored, and the quantum efficiency could be boosted by Sc-Ga substitution.

Language: Английский

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Ultra-sensitive luminescence thermometry based on MgNb₂O₆:Dy³⁺/Pr³⁺ thermochromic phosphors

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 9(22), P. 5757 - 5765

Published: Jan. 1, 2022

A novel ultra-sensitive ratiometric luminescence thermometry strategy combining the redshift of charge transfer band with dramatic quenching intervalent transition in MgNb 2 O 6 :Dy 3+ /Pr thermochromic phosphors.

Language: Английский

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Achieving Ultra-Wideband NIR-II Emission in Cr³⁺-Doped Li(Sc,In)(Si,Ge)O₄ Phosphors Based on Host Composition Engineering

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(35), P. 14494 - 14503

Published: Aug. 23, 2023

Realizing ultra-wideband and tunable near-infrared (NIR) emission remains a great challenge in NIR phosphor development. The luminescence of most reported phosphors exhibits peak wavelength shorter than 1000 nm the corresponding FWHM is <200 nm. Here, series Cr3+-activated Li(Sc,In)(Si,Ge)O4 with NIR-II are successfully developed based on host composition engineering strategy. Significant spectral region achieved changing from 1110 to 1253 olivine structure could provide Cr3+ activator highly distorted octahedral site very weak crystal field strength, which results > 300 A detailed discussion relationship between structural variation, splitting, has been applied. As far as we know, it first report about such long wide range. application these demonstrated intensity-based luminescent thermometry relative sensitivity >2.0% K–1 physiological temperature

Language: Английский

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High performance NIR-I to NIR-II emission of a Cr³⁺-doped Cs₂NaLuCl₆ phosphor with an IQE and EQE of up to 92.9% and 60.75%

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We developed a Cr 3+ -doped Cs 2 NaLuCl 6 by grinding–sintering method, which exhibited emission peaked at around 960 nm, with FWHM of ∼182 and the IQE EQE optimized phosphor were as high ∼92.9% ∼60.75%, respectively.

Language: Английский

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Tunable Luminescence in LiSc_1‐yGa_yW₂O₈:Cr³⁺ Phosphors for LED Applications

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 14, 2024

Abstract Achieving emission peaks in the near‐infrared II regions (NIR II) and tunable (NIR) is still a huge challenge development of NIR phosphors. Here, series LiSc 1‐y Ga y W 2 O 8 :Cr 3+ phosphors are reported based on crystal engineering, whose luminescence can be tuned from NIR‐II to I. LiScW possesses an ultra‐wide range 850–1400 nm with peak at 1069 full width half maximum (FWHM) 225 main light located region. Introducing into form , spectrum blueshifted, which better aligns characteristic absorption lines most functional groups. Additionally, intensity thermal stability also improved. The phosphor‐converted light‐emitting diodes (pc‐LED) device prepared by using optimized 0.5 :0.12Cr phosphor green chip, different absorptions detected measuring water ethanol pc‐LED as radiation source. These results indicate that :xCr holds potential for applications non‐destructive analysis.

Language: Английский

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Realization of Broadband Near-Infrared Emission with High Thermal Stability in YGa₃(BO₃)₄: Cr³⁺ Borate Phosphor

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(48), P. 19507 - 19515

Published: Nov. 17, 2023

As a key material for phosphor-converted light-emitting diodes (pc-LEDs) applications, broadband near-infrared (NIR) phosphors currently face poor thermal stability issues. In this work, we synthesized phosphor YGa3(BO3)4: Cr3+ (YGBO: Cr3+) with high stability. The YGBO: sample exhibits emission centered at 770 nm full width half-maximum (fwhm) of 2130 cm–1 under blue light excitation. Benefiting from the borate host crystal's strong structural rigidity, wide optical band gap, and weak electron–phonon coupling strength, demonstrates luminescence stability, corresponding intensity can maintain 80% 150 °C compared to room temperature. Furthermore, fabricated pc-LED device using chip phosphor, confirmed its application potential as source in spectral analysis fruit freshness.

Language: Английский

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Crystal-field regulation enables broadband-to-line emission switching in Cr³⁺-activated pyroxenes

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(7), P. 2379 - 2390

Published: Jan. 1, 2024

The realization of pressure-driven dynamic and reversible broadband-to-line emission switching in Cr 3+ -activated pyroxenes LiScSi 2 O 6 LiScGe through crystal field engineering.

Language: Английский

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Long-wavelength near-infrared light emitting Ni²⁺-doped double perovskite molybdate-based solid-solution phosphors

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We developed Ni 2+ -doped (Sr/Ba) 2 MgMoO 6 double perovskite molybdate-based solid-solution long wavelength near-infrared luminescence (1000–2000 nm) phosphors, which shiftss in the range of 1400–1610 nm by simple adjustment Sr/Ba ratio.

Language: Английский

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