Novel broadband NIR phosphors Y₂Mg₂Ga₂Si₂O₁₂:xCr³⁺ for NIR LED applications

Dalton Transactions, Journal Year: 2023, Volume and Issue: 52(19), P. 6569 - 6577

Published: Jan. 1, 2023

The Cr3+-doped near-infrared (NIR) phosphors have been extensively investigated owing to their promising applications in biomedicine, food safety detection, and night vision surveillance. However, achieving broadband (FWHM > 160 nm) NIR emission is still challenging. In this paper, novel Y2Mg2Ga2-xSi2O12:xCr3+ (YMGS:xCr3+, x = 0.005-0.08) were prepared by a high-temperature solid-state reaction. crystal structure, photoluminescence properties of the phosphor, device performance pc-LED researched detail. When excited at 440 nm, YMGS:0.04Cr3+ phosphor exhibited range 650-1000 peaking 790 nm with full width half-maximum (FWHM) up 180 nm. wide FWHM YMGS:Cr3+ conducive its extensive application spectroscopic technology. addition, could maintain 70% initial intensity 373 K. By combining commercial blue chip resulting demonstrated output power 14 mW photoelectric conversion efficiency 5% drive current 100 mA. This work provides option for devices.

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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Ultrabroadband Near‐Infrared Zn₃Ga₂GeO₈:Cr³⁺, Ni²⁺ Phosphor for PiG pc‐LED

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(32)

Published: Aug. 9, 2024

Abstract Cr 3+ ‐activated broadband near‐infrared (NIR) phosphors are studied extensively for application in phosphor converted light‐emitting diode (pc‐LED), a new light source substance testing based on NIR spectroscopy. However, the emission of is mainly located I region (700–1000 nm) and many substances show characteristic spectroscopy II (1000–1700 nm). In this paper, dual‐wavelength realized Ni 2+ codoped Zn 3 Ga 2 GeO 8 (ZGGO) via energy transfer from emitting to . The photoluminescent properties doped ZGGO as function doping concentration optimal concentrations determined be 0.04 0.003, respectively, with internal quantum efficiency (IQE) 37.5%. ZGGO:Cr , phosphor‐in‐glass (PiG), prepared fabricating PiG‐converted ultrabroadband LEDs avoid serious reabsorption pc‐LED packaged using dispersed epoxy resin or silicone. PiG offers photoelectric 4.3%@20 mA output power 17 mW@200 shows stable spectral distribution against drive current compared pc‐LED.

Language: Английский

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Strategy to optimize the broadband near-infrared emission based on Eu2+-doped sulfureted garnet phosphors toward emerging spectroscopy applications

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 678, P. 209 - 217

Published: Aug. 24, 2024

Language: Английский

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