Structural confinement toward suppressing concentration and thermal quenching for improving near-infrared luminescence of Fe<sup>3+</sup>

Zhao, Fangyi; Shao, Yuhe; Song, Zhen; Liu, Quanlin

doi:10.1039/d3qi01649h

Cited by 8 publications

(4 citation statements)

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“…11,12 Accordingly, a crowd of inorganic NIR-emitting phosphor materials have been developed for pc-LEDs, which are generally activated by rare earth ions and transition metal ions. [13][14][15][16][17] Although some substantial progress has been made, the development of efficient broadband NIRemitting phosphor materials remains a bottleneck. Therefore, great challenges still exist in exploring new materials systems with high-performance NIR luminescence.…”

Section: Introductionmentioning

confidence: 99%

Near‐infrared emitting metal halide materials: Luminescence design and applications

Liu,

Dang,

Zhang

et al. 2024

InfoMat

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Near‐infrared (NIR) luminescent metal halide (LMH) materials have attracted great attention in various optoelectronic applications due to their low‐temperature solution‐processable synthesis, abundant crystallographic/electronic structures, and unique optoelectronic properties. However, some challenges still remain in their luminescence design, performance improvement, and application assignments. This review systematically summarizes the development of NIR LMHs through classifying NIR luminescent origins into four major categories: band‐edge emission, self‐trapped exciton (STE) emission, ion emission, and defect‐related emission. The luminescence mechanisms of different types of NIR LMHs are discussed in detail by analyzing typical examples. Reasonable strategies for designing and optimizing luminescence/optoelectronic properties of NIR LMHs are summarized, including bandgap engineering, self‐trapping state engineering, chemical composition modification, energy transfer, and other auxiliary strategies such as improvement of synthesis scheme and post‐processing. Furthermore, application prospects based on the optoelectronic devices are revealed, including phosphor‐converted light‐emitting diodes (LEDs), electroluminescent LEDs, photodetectors, solar cells, and x‐ray scintillators, as well as demonstrations of some related practical applications. Finally, the existing challenges and future perspectives on the development of NIR LMH materials are critically proposed. This review aims to provide general understanding and guidance for the design of high‐performance NIR LMHs materials.image

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Section: Introductionmentioning

confidence: 99%

Near‐infrared emitting metal halide materials: Luminescence design and applications

Liu,

Dang,

Zhang

et al. 2024

InfoMat

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“…In addition, d-d forbidden transition of Fe 3+ ions and its strong electron-phonon coupling effect usually result in poor luminous efficiency and low thermal quenching (TQ) resistance of Fe 3+ -activated NIR phosphors. 9 More recent works have been done to tackle these problems of Fe 3+ -activated NIR phosphors. For example, Liu et al 1 reported a series of Sr 2−y Ca y InSbO 6 :Fe 3+ (y = 0-2) NIR phosphors with tunable emission from 935 to 1005 nm and high internal quantum efficiency (IQE) of 87%, but its emission loss at 398 K is up to 56%.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, its emission wavelength is just 770 nm which is too short to be applied in nondestructive biological monitoring fields. Recently, Zhao et al 9 reported Sr 9 Ga(PO 4 ) 7 :Fe 3+ NIR phosphor with dominant emission at 915 nm and a band width of 155 nm, yet, its IQE is only 6.6%. Therefore, it is urgent to develop highly efficient and thermally stable NIR phosphors with emission wavelength-tunable.…”

Section: Introductionmentioning

confidence: 99%

“…It is reported that most of the reported Fe 3+ ‐activated NIR phosphors show short emission wavelength (<900 nm) and unadjustable in emission wavelength (see Table 1). In addition, d–d forbidden transition of Fe 3+ ions and its strong electron‐phonon coupling effect usually result in poor luminous efficiency and low thermal quenching (TQ) resistance of Fe 3+ ‐activated NIR phosphors 9 . More recent works have been done to tackle these problems of Fe 3+ ‐activated NIR phosphors.…”

Section: Introductionmentioning

confidence: 99%

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Near‐unity quantum efficiency wavelength‐tunable NIR phosphors (Sr₂₋_yCa_y)Sc₁₋_xSbO₆: xFe³⁺ with excellent thermal stability

Yeerlan,

Zhang,

Dai

2024

J Am Ceram Soc.

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Fe3+ ions as near‐infrared (NIR) activators are emerging as an alternative to Cr3+.1–5 However, it is a challenge to develop Fe3+‐activated NIR phosphors featuring tunable optical properties, high efficiency, and thermal stability. Herein, we present a series of near‐unity internal quantum efficiency (IQE), wavelength‐tunable and thermal stability NIR‐emitting phosphors Sr2−yCaySc1−xSbO6:xFe3+ (S2−yCyS1−xS:xFe3+). Sr2ScSbO6:1%Fe3+ (SSS:1%Fe3+) phosphor shows broadband NIR emission at 904 nm and near‐unity IQE under excitation at 300 nm. Experimental and theoretical calculation results demonstrate that introduced Ca ions could increase the bandgap value and Debye temperature (ΘD) of host from Eg = 3.702 eV, ΘD = 609 K of y = 0 to Eg = 3.801 eV, ΘD = 692 K of y = 2. Significantly, the resultant S2−yCyS1−xS:1%Fe3+ NIR phosphors show wavelength‐tunable emission from 904 to 952 nm and high IQE of 84.6%–97.5% as well as enhanced thermal stability (I423K/I298K = 76.9%) of Ca2ScSbO6:1%Fe3+ (CSS:1%Fe3+) in comparison with that (I423K/I298K = 70.6%) of pristine sample. We fabricated an NIR light‐emitting diodes (LED) device by using CSS:1%Fe3+ NIR phosphors with ultraviolet LED chip and demonstrated its potential applications in anticounterfeiting, information encryption, and night vision.

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Achieving Broadband NIR Emission in Fe³⁺‐Activated ALaBB′O₆ (A = Ba, Sr, Ca; B–B′ = Li–Te, Mg–Sb) Phosphors via Multi‐Site Ionic Co‐Substitutions

Su,

Hu,

Ding

et al. 2023

Advanced Optical Materials

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Phosphor‐converted near‐infrared (NIR) LEDs are becoming increasingly demanded as miniature, portability, and broad emission spectrum. In this work, a class of Fe3+‐activated double perovskite structured is reported ALaBB′O6 (A = Ba, Sr, Ca; B–B′ = Li–Te, Mg–Sb) phosphors. Through the co‐substitution strategy at the A‐site and B‐B' sites, the emission spectral intensity and position of Fe3+ ions can be tuned. Finally, by utilizing Ca2+ at the A‐site and Mg–Sb co‐substitution for Li–Te, long‐wave NIR emission centered at 995 nm in CaLaMgSbO6: 0.6%Fe3+ with a full width at half maximum of 147 nm and internal quantum efficiency of 54.05% is achieved. The effects of the double perovskite crystal structure on Fe3+ photoluminescence properties are comprehensively analyzed. NIR LEDs are fabricated by encapsulating UV chips with the synthetic CaLaMgSbO6: 0.6%Fe3+ phosphors, and their application value in night vision, nondestructive biological monitoring, and NIR detection is evaluated.

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Structural confinement toward suppressing concentration and thermal quenching for improving near-infrared luminescence of Fe³⁺

Abstract: Luminescence concentration quenching and thermal quenching are closely related to the energy transfer (ET) process between optically active ions. Herein, we utilize the structural confinement effect in Sr9Ga(PO4)7 (SGP) to...

Cited by 8 publications

References 45 publications

Near‐infrared emitting metal halide materials: Luminescence design and applications

Near‐infrared emitting metal halide materials: Luminescence design and applications

Near‐unity quantum efficiency wavelength‐tunable NIR phosphors (Sr₂₋_yCa_y)Sc₁₋_xSbO₆: xFe³⁺ with excellent thermal stability

Achieving Broadband NIR Emission in Fe³⁺‐Activated ALaBB′O₆ (A = Ba, Sr, Ca; B–B′ = Li–Te, Mg–Sb) Phosphors via Multi‐Site Ionic Co‐Substitutions

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Structural confinement toward suppressing concentration and thermal quenching for improving near-infrared luminescence of Fe3+

Abstract: Luminescence concentration quenching and thermal quenching are closely related to the energy transfer (ET) process between optically active ions. Herein, we utilize the structural confinement effect in Sr9Ga(PO4)7 (SGP) to...

Cited by 8 publications

References 45 publications

Near‐infrared emitting metal halide materials: Luminescence design and applications

Near‐infrared emitting metal halide materials: Luminescence design and applications

Near‐unity quantum efficiency wavelength‐tunable NIR phosphors (Sr2−yCay)Sc1−xSbO6: xFe3+ with excellent thermal stability

Achieving Broadband NIR Emission in Fe3+‐Activated ALaBB′O6 (A = Ba, Sr, Ca; B–B′ = Li–Te, Mg–Sb) Phosphors via Multi‐Site Ionic Co‐Substitutions

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Resources

About

Structural confinement toward suppressing concentration and thermal quenching for improving near-infrared luminescence of Fe³⁺

Near‐unity quantum efficiency wavelength‐tunable NIR phosphors (Sr₂₋_yCa_y)Sc₁₋_xSbO₆: xFe³⁺ with excellent thermal stability

Achieving Broadband NIR Emission in Fe³⁺‐Activated ALaBB′O₆ (A = Ba, Sr, Ca; B–B′ = Li–Te, Mg–Sb) Phosphors via Multi‐Site Ionic Co‐Substitutions