Multi-sites energy transfer in Fe³⁺-doped KAl₁₁O₁₇ phosphor toward zero thermal quenching near-infrared luminescence

Optics Letters, Год журнала: 2023, Номер 48(5), С. 1296 - 1296

Опубликована: Фев. 2, 2023

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have demonstrated great potential for optoelectronic and biomedical applications, while the exploration of NIR phosphors with high thermal stability remains a challenge. Herein, we report an phosphor KAl11O17:Fe3+ zero quenching (TQ) behavior up to 200°C. The asymmetrical broadband emission three sub-bands centered at 700, 770, 800 nm is related superposition different Fe3+ centers located in Al2O4, Al3O6, Al4O6 sites KAl11O17 host, respectively. Temperature- concentration-dependent spectra verify that energy transfer (ET) between multiple emitters weak electron-phonon coupling (EPC) effect contribute thermally stable emission. fabricated pc-LED using optimized exhibits information encryption applications.

Язык: Английский

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Energy transfer realizes efficient NIR emitting Ca2ScTaO6:Cr3+, Yb3+ perovskite-structured phosphors

Ceramics International, Год журнала: 2023, Номер 49(10), С. 15717 - 15725

Опубликована: Янв. 28, 2023

Язык: Английский

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Minimizing Bond Angle Distortion to Improve Thermal Stability of Cr³⁺ Doped Near‐Infrared Phosphor

Laser & Photonics Review, Год журнала: 2023, Номер 17(9)

Опубликована: Май 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.

Язык: Английский

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Efficient and stable near-infrared Y₂Mg₂Al₂Si₂O₁₂:Cr³⁺ phosphor: analysis of the luminescence source by a site elimination strategy

Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(8), С. 2814 - 2823

Опубликована: Янв. 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.

Язык: Английский

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Synergy between structural rigidity and cluster defects in a bright near-infrared Cr³⁺-based phosphor for excellent thermal stability and long afterglow

Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(26), С. 9716 - 9732

Опубликована: Янв. 1, 2024

This work investigates the important role of structural rigidity and defect related dynamics a promising garnet phosphor with robust thermal stability for efficient NIR pc-LED devices.

Язык: Английский

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