Developing and optimizing novel Cr<sup>3+</sup>-activated inorganic NIR phosphors by combining triple-objective optimization and crystal field engineering

Jiang, Lipeng; Jiang, Xue; Yang, Mei; Zhao, Xinpeng; Wang, Changxin; Gao, Panpan; Su, Yanjing

doi:10.1039/d3qi02120c

Cited by 5 publications

(1 citation statement)

References 61 publications

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“…Cr 3+ -doped phosphors have the potential to revolutionize the world of near-infrared (NIR) lighting by replacing traditional incandescent and xenon lighting systems with energy-efficient and long-lasting phosphor-converted light-emitting-diode (pc-LED) light sources. [1][2][3][4][5] These pc-LEDs have several technological benefits, such as energy saving, faster start-up, and prolonged lifespan. [6][7][8] However, the current Cr 3+doped NIR phosphors lead to a limited detection capability in NIR spectroscopy applications due to their narrow emission bandwidth of <200 nm and emission wavelengths of <900 nm.…”

Section: Introductionmentioning

confidence: 99%

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Jiang,

Zhang,

Zhao

et al. 2024

Laser & Photonics Reviews

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Near‐infrared (NIR) light sources have gained immense popularity in recent years due to their wide range of applications in various fields, including spectroscopy and biomedical imaging. However, the limited emission bandwidth of NIR phosphors is a significant bottleneck in their development. Here, a novel strategy is reported to broaden the emission bandwidth of NIR phosphors by awakening the dumb site. Na4M3Ta(PO4)6: Cr3+ (M = Al3+, Ga3+, In3+) phosphor is synthesized, which exhibits a greatly broadened bandwidth from 134 to 232 nm. Structural and spectral analysis reveals that the NaO6 octahedral site has a severe t2g‐type distortion, making it a dumb site for Cr3+. By introducing larger In3+ at the M site, the angular distortion at the NaO6 site decreases to the normal range, enabling the luminescence of Cr3+ again. Along with the broadened bandwidth, the emission peak also redshifts from 802 to 977 nm, giving advantages in NIR spectroscopy applications. Interestingly, the awakened luminescence at the NaO6 site shows even better luminescence properties than the original M/TaO6 octahedral site. These findings reveal a novel insight into the luminescence of Cr3+ at the octahedral site, which could potentially revolutionize the design of NIR phosphors.

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Section: Introductionmentioning

confidence: 99%

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Jiang,

Zhang,

Zhao

et al. 2024

Laser & Photonics Reviews

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Broadband NIR‐II Emission Generated by Tetrahedral Cr³⁺/Cr⁴⁺ in SrLaGa₃O₇

Shen,

Li,

Yang

et al. 2024

Laser & Photonics Reviews

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Broadband near‐infrared (NIR) phosphors have garnered significant attention due to their potential applications in phosphor‐concerted NIR light‐emitting diodes (pc‐NIR‐LEDs). Cr3+‐doped NIR phosphors are particularly intriguing because of their broad NIR emission and high efficiency. However, reports on Cr3+‐doped NIR‐II (900–1700 nm) phosphors are scarce. In this study, a novel Cr3+‐doped SrLaGa3O7 NIR‐II phosphor is presented, where the Cr3+ ions are located at tetrahedral sites. The full width at half maximum (FWHM), peak wavelength, internal quantum efficiency (IQE), and thermal activation energy (ΔE) for the synthesized SrLaGa3O7:0.9%Cr3+ phosphor are 194 nm, 1167 nm, 76.12%, and 0.269 eV, respectively. The substitution of Sc3+ for Ga3+ enhances the luminescence performance, and the 0.9%Cr3+/3%Sc3+ co‐doped SrLaGa3O7 phosphor exhibits a peak wavelength of 1208 nm, an IQE of 92.78%, and a ΔE of 0.285 eV. Furthermore, the sintering process in the air induces a transition from Cr3+ to Cr4+, resulting in the formation of SrLaGa3O7:0.9%Cr4+ phosphor, which has a peak wavelength of 1270 nm and an FWHM of 305 nm. The potential application of the 0.9%Cr3+/3%Sc3+ co‐doped SrLaGa3O7 phosphor in pc‐NIR‐LEDs is also evaluated.

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Expanding near-infrared emission bandwidth in K2NaCrF6:Fe3+ phosphors through dipole-dipole energy transfer

Yang,

Yu,

Liu

et al. 2024

Journal of Alloys and Compounds

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Developing and optimizing novel Cr³⁺-activated inorganic NIR phosphors by combining triple-objective optimization and crystal field engineering

Abstract: A novel approach combining TOO and CFE for new NIR phosphors development was proposed. Under the guidance of this strategy, LaGa0.5Sb1.5O6:Cr3+ with wavelengths longer than 850 nm and balanced performance was discovered.

Cited by 5 publications

References 61 publications

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Broadband NIR‐II Emission Generated by Tetrahedral Cr³⁺/Cr⁴⁺ in SrLaGa₃O₇

Expanding near-infrared emission bandwidth in K2NaCrF6:Fe3+ phosphors through dipole-dipole energy transfer

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Developing and optimizing novel Cr3+-activated inorganic NIR phosphors by combining triple-objective optimization and crystal field engineering

Abstract: A novel approach combining TOO and CFE for new NIR phosphors development was proposed. Under the guidance of this strategy, LaGa0.5Sb1.5O6:Cr3+ with wavelengths longer than 850 nm and balanced performance was discovered.

Cited by 5 publications

References 61 publications

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Awakening the Dumb Site to Realize Ultra‐Broadband NIR Phosphor

Broadband NIR‐II Emission Generated by Tetrahedral Cr3+/Cr4+ in SrLaGa3O7

Expanding near-infrared emission bandwidth in K2NaCrF6:Fe3+ phosphors through dipole-dipole energy transfer

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Developing and optimizing novel Cr³⁺-activated inorganic NIR phosphors by combining triple-objective optimization and crystal field engineering

Broadband NIR‐II Emission Generated by Tetrahedral Cr³⁺/Cr⁴⁺ in SrLaGa₃O₇