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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Highly efficient Fe3+-doped A2BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis

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

Published: April 27, 2022

Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr3+-activated NIR-emitting phosphors, next-generation Cr3+-free phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of luminescent materials different application fields. Here, we report Fe3+-activated Sr2-yCay(InSb)1-zSn2zO6 that exhibit unprecedented long-wavelength emission. The overall emission tuning from 885 1005 nm broadened full-width at half maximum 108 146 was realized through a crystallographic site engineering strategy. significantly enhanced after complete Ca2+ incorporation owing substitution-induced lower symmetry Fe3+ sites. Ca2InSbO6:Fe3+ phosphor peaking 935 showed an ultra-high internal quantum 87%. as-synthesized emission-tunable demonstrated great potential spectroscopy detection. This work initiates development efficient broadband opens up new avenue designing materials.

Language: Английский

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Structural Rigidity Control toward Cr³⁺-Based Broadband Near-Infrared Luminescence with Enhanced Thermal Stability

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(3), P. 1376 - 1384

Published: Jan. 19, 2022

Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for biochemical analysis and medical diagnosis applications; however, the development of target NIR phosphor is still a challenge. Herein, broadband phosphors, Cr3+-activated CaSc1–xAl1+xSiO6 (λem = 950 nm), designed optimized by chemical substitution toward enhanced quantum efficiency thermal stability. Structural spectral analyses along with density functional theory calculations reveal that Sc3+/Al3+ contributes to enhancing structural rigidity local symmetry [Sc/AlO6] octahedron so nonradiative relaxation Cr3+ emission centers suppressed significantly. The as-fabricated phosphor-in-glass-based LED source demonstrates great potential in detection alcohol concentration. This study provides structure design principle exploring phosphors stability will also stimulate further studies material discovery quantitative spectroscopy.

Language: Английский

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Efficient and Thermally Stable Broad-Band Near-Infrared Emission in a KAlP₂O₇:Cr³⁺ Phosphor for Nondestructive Examination

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(9), P. 11663 - 11671

Published: Feb. 23, 2022

Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band remains a significant challenge. In this work, phosphate, KAlP2O7, with wide band gap suitable electronic environment Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits emission covering 650-1100 nm peak centered at 790 full width half-maximum (fwhm) of 120 under 450 excitation. internal quantum efficiency (IQE) determined be 78.9%, intensity 423 K still maintains 77% that room temperature, implying high excellent thermal stability Finally, phosphor-converted light-emitting diode (pc-LED) device fabricated by using as-prepared combined blue LED chip, which presents output power 32.1 mW photoelectric conversion 11.4% drive current 100 mA. Thus, work not only provides an inexpensive performance pc-LEDs but also highlights some strategies explore class materials.

Language: Английский

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Cr³⁺ Activated Garnet Phosphor with Efficient Blue to Far‐Red Conversion for pc‐LED

Advanced Optical Materials, Journal Year: 2021, Volume and Issue: 9(20)

Published: Aug. 8, 2021

Abstract Far‐red (FR) phosphor‐converted light‐emitting diodes (pc‐LEDs) driven by blue LED chips are novel light sources for applications in phototherapy, photosynthesis, natural simulation, and so on but still bear low electricity‐to‐FR conversion efficiency (≤ 23%) due to deficiency of phosphors that have both high absorptance FR internal quantum (IQE) the realization efficient conversion. Ca 3 Sc 2 Si O 12 (CSSG):Cr 3+ garnet phosphor has ultra‐high IQE (> 90%) absorption. Here, a twofold increase absorption cross‐section is reported with via Lu −Mg 2+ substitution −Sc CSSG:Cr form 3– x Mg 2– :Cr solid solution, which attributed enhanced mixing odd‐parity configuration into d Cr induced cations substitution. Optical properties, crystal field strengths, thermal stabilities solution studied as function . After complete replacement , as‐fabricated pc‐LED emits at 750 nm 65.7% blue‐to‐FR consequently offers an over 30%. Moreover, show quenching temperatures range 580–610 K. The results can advance development pc‐LEDs various applications.

Language: Английский

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Modulation of Thermally Stable Photoluminescence in Cr³⁺-Based Near-Infrared Phosphors

The Journal of Physical Chemistry Letters, Journal Year: 2022, Volume and Issue: 13(22), P. 5001 - 5008

Published: June 1, 2022

Broadband near-infrared (NIR) light sources based on phosphor-converted light-emitting diodes (pc-LEDs) are desirable for various photonics applications, while developing thermally stable NIR phosphors remains a great challenge. Increasing the temperature accelerates severe nonradiative relaxation process gorverned by intrinsic energy gap law, which further suspends efficient low-energy emission of Cr3+ emitters in inorganic lattice. To address this rule, several state-of-the-art strategies have been put forward perspective to modulate critical law from viewpoints (1) crystal structure design, (2) defect engineering, (3) strengthened rigidity, and (4) transfer. This suggests avenues exploring novel broadband with high thermal stability will also stimulate studies spectroscopy high-power applications.

Language: Английский

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Broadband Short-Wave Infrared Light-Emitting Diodes Based on Cr³⁺-Doped LiScGeO₄ Phosphor

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(30), P. 36011 - 36019

Published: July 21, 2021

Short-wave infrared (SWIR) spectroscopy has recently emerged as an important technology across a wide range of areas, whether industrial, biomedical, or environmental. Nevertheless, it is still long-standing challenge to develop robust SWIR light sources. The phosphor-convert emitting diodes (LEDs) by coating blue LED chips with desirable SWIR-emitting phosphors are becoming ideal alternative for solid-state sources due its compactness, low-cost, and long operating lifetime, does the commercial white LEDs. Herein, we report blue-pumped Cr3+-doped LiScGeO4 phosphor luminescent converter This shows intense emission band peak wavelength at ∼1120 nm owing 4T2 → 4A2 electron transition Cr3+ when exciting light. full width half-maximum (fwhm) ∼300 absolute quantum efficiency determined be ∼26%. prototypes constructed combining optimized materials InGaN chips, which can generate commendable in region over 800–1600 achieve maximum output power ∼4.78 mW 60 mA photoconversion 4.4%. current exploration will lay foundation engineer LEDs applications night-vision surveillance technology. These blue-light-excitable serve complement spectral gap pave way toward cost-effective phosphor-converted

Language: Английский

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Efficient broadband near-infrared luminescence of Cr3+ doped fluoride K2NaInF6 and its NIR-LED application toward veins imaging

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 427, P. 131740 - 131740

Published: Aug. 13, 2021

Language: Английский

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Highly Efficient Broadband Near-Infrared Luminescence with Zero-Thermal-Quenching in Garnet Y₃In₂Ga₃O₁₂:Cr³⁺ Phosphors

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(18), P. 8418 - 8426

Published: Sept. 15, 2022

Broadband near-infrared (NIR) light source based on phosphor-converted light-emitting-diode (pc-LED) is crucial for applications in medical diagnosis, food quality analysis, and night vision fields, motivating the development of highly efficient thermal robust NIR phosphor materials. Herein, a novel Cr3+-doped garnet Y3In2Ga3O12:Cr3+ emerges from fundamental study Ln3In2Ga3O12 (Ln = La, Gd, Y, Lu) family. Upon 450 nm excitation, this material presents broadband emission covering 650–1100 with peak located at 760 full width half maximum 125 nm. This also possesses an ultrahigh internal quantum efficiency (IQE 91.6%) absorption (AE 46.6%), resulting external as high 42.7%. Moreover, intensity 150 °C maintains 100% initial intensity, showing rare zero-thermal-quenching property. Fabricating pc-LED device by using material, excellent output power 68.4 mW photoelectric 15.9% under mA driving current can be obtained, which exhibits much better performance than devices fabricated some reported Therefore, work not only provides ultraefficient thermally spectroscopy application but contributes to foundation design rules materials performance.

Language: Английский

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Efficient broadband near-infrared phosphor Sr2ScSbO6:Cr3+ for solar-like lighting

Science China Materials, Journal Year: 2021, Volume and Issue: 65(3), P. 748 - 756

Published: Sept. 28, 2021

Language: Английский

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