Efficient and Broadband LiGaP₂O₇:Cr³⁺ Phosphors for Smart Near‐Infrared Light‐Emitting Diodes

Laser & Photonics Review, Journal Year: 2021, Volume and Issue: 15(11)

Published: Oct. 11, 2021

Abstract Broadband near‐infrared (NIR) phosphor‐converted (pc) LED is promising next‐generation tiny light source for smart and broadband NIR spectroscopy technology. However, phosphors suffer from challenges in terms of low quantum efficiency bandwidth. By selecting a host that has big bandgap weakening coupling effect among Cr 3+ , novel LiGaP 2 O 7 :Cr (LGAP:Cr ) phosphor high external (28.3%) discovered. Under ≈450 nm excitation, LGAP:Cr shows broad emission 700 to 1100 with bandwidth ≈170 nm. Importantly, the fabricated pcLED demonstrates bright an excellent performance night vision. The results promise use high‐performance employs only one blue chip.

Language: Английский

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Broadband Near-Infrared Emitting Ca₂LuScGa₂Ge₂O₁₂:Cr³⁺ Phosphors: Luminescence Properties and Application in Light-Emitting Diodes

Inorganic Chemistry, Journal Year: 2020, Volume and Issue: 59(18), P. 13481 - 13488

Published: Sept. 2, 2020

In recent years, the demand for near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) has increased rapidly, leading to more and attention being paid research of broad-band phosphors. this work, Cr3+-doped Ca2LuScGa2Ge2O12 (CLSGG:Cr3+) phosphors with NIR emission were prepared through traditional high-temperature solid-state reactions. The crystal structures analyzed by X-ray diffraction (XRD) Rietveld refinement. photoluminescence excitation (PLE) spectra synthesized CLSGG:Cr3+ exhibit a strong absorption band in 400-500 nm region, which matches well blue-light-emitting chip. (PL) show ranging from 650 1100 full width at half-maximum (fwhm) about 150 nm. At 423 K, integrated intensity CLSGG:0.02Cr3+ is 59% that room temperature. A pc-LED device was fabricated combining mixture as-synthesized phosphor silicone 460 Under driving current 100 mA, output power can achieve 1.213 mW, indicating as-prepared are promising applications.

Language: Английский

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A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(36)

Published: June 24, 2021

Abstract The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources emerging applications. Herein, a series hexafluorides A 2 BMF 6 :Cr 3+ (A = Na, K, Rb, Cs; B Li, M Al, Ga, Sc, In) peaking at ≈733–801 nm with full width half maximum (FWHM) ≈98–115 are synthesized by general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation trivalent metal sources, Cr can be more efficiently doped into simultaneously prevent generation competitive phase. Particularly, Na 3 ScF (λ em 774 nm, FWHM ≈ 108 nm) optimal ‐doping concentration 35.96% shows high internal quantum efficiency 91.5% an external ≈40.82%. emitting diode (LED) device output power ≈291.05 mW 100 mA driven current photoelectric conversion 20.94% fabricated. strategy opens up new avenues exploration ‐doped phosphors, as‐obtained record demonstrates LED

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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