High Output Power and High Quantum Efficiency in Novel NIR Phosphor MgAlGa_0.7B_0.3O₄:Cr³⁺ with Profound FWHM Variation

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(9)

Published: Nov. 8, 2023

Abstract There is strong demand for ultraefficient near‐infrared (NIR) phosphors with adjustable emission properties next‐generation intelligent NIR light sources. Designing large full‐width at half‐maximum (FWHM) variations challenging. In this study, novel near‐ultraviolet light‐emitting diode (LED)‐excited phosphors, MgAlGa 0.7 B 0.3 O 4 :Cr 3+ (MAGBO:Cr ), three centers achieve ultra‐narrowband (FWHM = 29 nm) to ultra‐broadband 260 increasing Cr concentration. Gaussian fitting and decay time analysis reveal the alteration in FWHM, which attributed energy transfer occurring between centers. The distinct thermal quenching behaviors of are revealed through temperature‐dependent times. phosphor MAGBO:0.05Cr exhibits high stability (85%, 425 K) exceptional external quantum efficiency 68.5%. An phosphor‐converted LED (pc‐LED) fabricated using phosphor, exhibiting a remarkable output power 136 mW 600 mA pc‐LEDs. This study describes preparation highly efficient provides further understanding tunable vital high‐performance versatile applications.

Language: Английский

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Developing the Na₂CaZr₂Ge₃O₁₂:Cr³⁺ Garnet Phosphor for Advanced NIR pc-LEDs in Night Vision and Bioimaging

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(9), P. 4654 - 4663

Published: May 1, 2024

Materials emitting near-infrared (NIR) light play a crucial role in the development of phosphor-converted light-emitting diodes (pc-LEDs) for applications ranging from fundamental science like spectroscopic analysis to highly applied uses night vision and biological imaging. One class materials that has garnered significant interest these technical spaces is Cr3+-activated garnets due their high efficiency ability operate at relatively temperatures. However, limited emission beyond 800 nm impedes use as optimal blue LED-pumped NIR-emitting materials. In this study, we present new garnet-type NIR phosphor, Na2CaZr2Ge3O12:Cr3+, addresses challenge─the material exhibits long-wavelength (λem,max = 832 nm) good thermal quenching resistance while maintaining an excellent internal quantum (IQE 98%). These properties are attributed crystal environment reconstruction, where structure distortion coupled weak field, which uncommon most rigid phosphors. Furthermore, fabricated pc-LED devices using demonstrate superior performance compared with employing well-known efficient phosphors operating range. The source subsequently demonstrated spanning vision, bioimaging, nondestructive analysis. This study not only provides insights into luminescence garnet desirable but also highlights practical application

Language: Английский

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Thermally stable fluoride phosphor Na3Sc2Li3F12:Cr3+ with broadband emission for NIR pc-LED applications

Optical Materials, Journal Year: 2024, Volume and Issue: 149, P. 115040 - 115040

Published: Feb. 14, 2024

Language: Английский

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Multi-site occupancy high-efficient Mg2LaTaO6:Cr3+ phosphor for application in broadband NIR pc-LEDs

Ceramics International, Journal Year: 2023, Volume and Issue: 50(3), P. 5242 - 5249

Published: Nov. 24, 2023

Language: Английский

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Developing Broadband Cr³⁺-Substituted Phosphor-Converted Near-Infrared Light Sources

ACS Applied Optical Materials, Journal Year: 2023, Volume and Issue: 1(6), P. 1138 - 1149

Published: May 4, 2023

Near-infrared (NIR) spectroscopy is a rapidly growing research area due to its noninvasive, inexpensive, and rapid analysis capabilities spanning various applications. The key technology behind the growth of this field involves phosphor-converted NIR light-emitting diodes (pc-NIR LEDs) their energy efficiency, long operating lifetimes, chemical physical stability. Numerous studies have reported new Cr3+-substituted phosphors that can more effectively convert blue LED emission radiation with broad full-width-at-half-maximum (fwhm) covers significant portion interatomic vibrational spectrum. However, there still much learn about these materials' structure–property relationships. In Spotlight on Applications, we discuss current progress in designing broadband Cr3+ as sources light, specifically emphasizing our research. We examine results from work others been used create an efficient range. discussion also emphasizes techniques analyze improve temperature-dependent photoluminescence. Finally, highlight potential applications Cr3+-based pc-NIR LEDs fields such night vision, bioimaging, food freshness analysis. This Applications aims provide overview based by challenges associated advancement while offering few suggestions for ventures field.

Language: Английский

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Efficient and Tunable Near-Infrared Luminescence in Cubic Phosphate K₂AlTi(PO₄)₃:Cr³⁺ for Spectroscopy Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(31), P. 41119 - 41126

Published: July 29, 2024

Broadband near-infrared (NIR) phosphors are crucial components of NIR phosphor-converted light-emitting diode (pc-LED) sources for various smart spectroscopy applications. However, developing an efficient, tunable, and inexpensive broadband phosphor with sufficient spectral coverage remains a great challenge. In this work, cubic phosphate K2AlTi(PO4)3 highly structural rigidity was chosen as host material Cr3+ substitution to create efficient emission. Synthesizing compound, the obtained exhibits emission covering 700–1200 nm peak wavelength ranging from 820 860 depending on substituting concentration. The concentration optimized sample possesses photoluminescence quantum yield (PLQY) 76.4% centered at 857 full width half-maximum (fwhm) 184 under 464 exaction, demonstrating relatively long-wavelength wide coverage. This is mainly derived single kind center deduced analysis, luminescence dynamics, first-principle calculations. Using material, fabricated pc-LED device presents excellent output power photoelectric conversion efficiency, making attractive in practical applications night-vision bioimaging. Therefore, work not only provides superiorities low cost, high wide-range tunability, coverage, but also highlights some clues discover materials.

Language: Английский

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Efficient and Thermally Stable Cr³⁺‐Doped Phosphor Achieved by Cation Substitution: Plant Lighting Application

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(33)

Published: Oct. 17, 2024

Abstract Far‐red phosphor‐converted light‐emitting diodes are receiving increasing attention as an essential component of the next‐generation plant‐growth lights. However, developing far‐red phosphors with high quantum efficiency, low thermal quenching, and suitable emitting wavelength is crucial urgent. Herein, a new phosphor BaY 2 Ga 3.9 GeO 12 :0.1Cr 3+ internal efficiency (98%) stability (90.2%@423K) obtained via substitution CaO 8 bigger BaO dodecahedrons, which attributed to variations in lattice environment Cr . Meanwhile, controllable emission tuning from 780 708 nm enhanced luminescence performance achieved due cation can reduce production 4+ modulate occupancy ions, enhancement metal‐ligand interactions resulting crystal field breaking forbidden d‐d transition The proof‐of‐concept demonstration pakchoi lighting experiment reveals great potential :Cr stimulating plant growth pushing yield. These results demonstrate feasibility cationic optimize optical ‐doped phosphors, providing alternative strategy for designing efficient light sources lighting.

Language: Английский

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A NIR phosphor with ultra-broadband emission enabled by dual energy transfer within two Cr³⁺ emitters and Cr³⁺ → Yb³⁺

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(14), P. 4977 - 4985

Published: Jan. 1, 2024

The NIR phosphor Sr 3 SiAl 10 O 20 , which realizes ultra-broadband emission via dual energy transfer within two Cr 3+ emitters and → Yb can be used for pc-LEDs, showing great potential in the fields of night-vision illumination, nondestructive surveillance, information encryption.

Language: Английский

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Laser‐Driven (Ga/Sc)₂O₃:Cr³⁺ Luminescent Ceramics Enabling Near‐Infrared Light Source for Noninvasive Imaging and Detection

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract High‐power broadband near‐infrared (NIR) light sources have received extensive attention in long‐distance night vision lighting, non‐invasive detection and imaging, quantitative analysis of organic components. However, developing targeted NIR‐emitting phosphors with high external quantum efficiency (EQE) thermal stability remains a challenge to raise the NIR output power expand applications. Herein, Ga 1.98− x Sc O 3 :0.02Cr 3+ luminescent ceramics are prepared redshifted emission peaks from 710 820 nm depending on weakened crystal field. The optimized 1.18 0.8 ceramic exhibits EQE 79.6% excellent ( I 423 K / 298 = 72%) under 468 excitation, which brings saturation threshold up 893 mW@3 W mm −2 450 laser pumping. high‐power laser‐driven source demonstrates potential alcohol concentration. This study opens new avenues for exploration sources.

Language: Английский

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Tunable broadband near-infrared emission in LiScO2:Cr3+ phosphor induced by the variation of chromium ion concentration

Journal of Luminescence, Journal Year: 2023, Volume and Issue: 257, P. 119758 - 119758

Published: Feb. 14, 2023

Language: Английский

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