Ceramics International, Год журнала: 2025, Номер unknown
Опубликована: Апрель 1, 2025
Язык: Английский
Advanced Materials, Год журнала: 2023, Номер 36(9)
Опубликована: Ноя. 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.
Язык: Английский
Процитировано
54
Chemistry of Materials, Год журнала: 2024, Номер 36(9), С. 4654 - 4663
Опубликована: Май 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
Язык: Английский
Процитировано
28
Optical Materials, Год журнала: 2024, Номер 149, С. 115040 - 115040
Опубликована: Фев. 14, 2024
Язык: Английский
Процитировано
9
Ceramics International, Год журнала: 2023, Номер 50(3), С. 5242 - 5249
Опубликована: Ноя. 24, 2023
Язык: Английский
Процитировано
22
ACS Applied Optical Materials, Год журнала: 2023, Номер 1(6), С. 1138 - 1149
Опубликована: Май 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.
Язык: Английский
Процитировано
18
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(31), С. 41119 - 41126
Опубликована: Июль 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.
Язык: Английский
Процитировано
8
Advanced Optical Materials, Год журнала: 2024, Номер 12(33)
Опубликована: Окт. 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.
Язык: Английский
Процитировано
7
Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(14), С. 4977 - 4985
Опубликована: Янв. 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.
Язык: Английский
Процитировано
6
Laser & Photonics Review, Год журнала: 2024, Номер unknown
Опубликована: Сен. 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.
Язык: Английский
Процитировано
6
Journal of Luminescence, Год журнала: 2023, Номер 257, С. 119758 - 119758
Опубликована: Фев. 14, 2023
Язык: Английский
Процитировано
15