Опубликована: Янв. 1, 2024
Язык: Английский
Journal of Alloys and Compounds, Год журнала: 2023, Номер 942, С. 168893 - 168893
Опубликована: Янв. 17, 2023
Язык: Английский
Процитировано
49
Advanced Powder Materials, Год журнала: 2024, Номер 3(3), С. 100186 - 100186
Опубликована: Март 6, 2024
Cr3+-activated near-infrared (NIR) phosphors are key for NIR phosphor-converted light emitting diodes (NIR pc-LED). While, the site occupancy of Cr3+ is one debates that have plagued researchers. Herein, Y2Mg2Al2Si2O12 (YMAS) with multiple cationic sites chosen as host to synthesize YMAS: xCr3+ phosphors. In YMAS, ions occupy simultaneously Al/SiO4 tetrahedral, Mg/AlO6 octahedral, and Y/MgO8 dodecahedral which form three luminescent centers named Cr1, Cr2, Cr3, respectively. Cr1 Cr2 relate an intermediate crystal field, transitions 2E→4A2 4T2→4A2 occurring simultaneously. As concentration increases, transition becomes more pronounced in resulting a red-shift broadband emission. Cr3 consistently behaves weak field exhibits broad long-wavelength Wide-range emission centering at 745 nm realized 0.03Cr3+ phosphor. This phosphor has high internal quantum efficiency (IQE = 86%) satisfying luminescence thermal stability (I423 K 70.2%). Using this phosphor, pc-LEDs 56.6 mW@320 mA optical output power packaged applied. Present study not only demonstrates multi-site certain oxide but also provides reliable approach via choosing diverse local environments achieve
Язык: Английский
Процитировано
32
Ceramics International, Год журнала: 2024, Номер 50(11), С. 18647 - 18654
Опубликована: Март 5, 2024
Язык: Английский
Процитировано
17
Inorganic Chemistry, Год журнала: 2024, Номер 63(14), С. 6555 - 6563
Опубликована: Март 26, 2024
Near-infrared (NIR) phosphor conversion light-emitting diodes (pc-LEDs) have great application potential as NIR light sources in many fields such food analysis, night vision illumination, and bioimaging for noninvasive medical diagnosis. In general, phosphors synthesized by a high-temperature solid-phase method large particle sizes to be processed fine powders grinding process, which may introduce surface defects lower the luminous efficiency. Here, we report sol–gel sintering with ammonium nitrate citric acid sacrificing agents synthesize high purity, nanosized (less than 50 nm) Zr4+/Ni2+ codoped MgAl2O4 spinel phosphors, is matrix, Ni2+ center, Zr4+ acts charge compensator. We systematically characterized crystal structures luminescence properties of Ni2+-doped MgAl2O4. Under 390 nm excitation, emission spectrum covers 900–1600 nm, half-peak width 251 peak position located at 1230 nm. demonstrated that incorporating small amounts compensator, intensity was doubled over phosphor. The optimal content compensator 2 mol %. More importantly, inclusion led improved thermal stability properties, measured 100 °C 33.83% room temperature (20 °C). This study demonstrates nanomaterials high-purity enhanced optical can designed through compensation strategy method.
Язык: Английский
Процитировано
17
Laser & Photonics Review, Год журнала: 2025, Номер unknown
Опубликована: Янв. 29, 2025
Abstract Achieving ultra‐broadband absorption and enhancing the near‐infrared (NIR) emitting properties of NIR phosphors is a key challenge to realize its multiple applications, such as solar spectrum conversion, spectral analysis, night vision. Here, novel phosphor system MTiTaO 6 : Cr 3+ ( M = Al , Ga Sc ), with an excitation broad 421 nm enhanced emission reported. It widest among known ‐doped phosphors. Structural spectroscopic analysis shows that originates from overlap luminescence centers. Additionally, peak red‐shifted 816 871 increasing ion radius, intensity enhanced, which not only makes spectra more compatible response curve c‐Si cells, but also gives it advantage in spectroscopy applications. Comparison water alcohol demonstrate promising
Язык: Английский
Процитировано
2
Advanced Functional Materials, Год журнала: 2024, Номер 34(22)
Опубликована: Фев. 7, 2024
Abstract In addressing the broad spectrum of applications for optical pressure sensors, their predominant drawback lies in limited sensitivity to fluctuations. To overcome these constraints, this study introduces a luminescent manometer harnessing emission properties Cr 3+ ions Li 3 Sc 2 (PO 4 ) , operational three distinct reading modes: spectral shift, ratiometric, and lifetime‐based. Notably, conducted research establishes as most sensitive reported date both spectra shift (λ/dp = 23.9 nm/GPa) lifetime‐based (S R 93.56%/GPa) modes. A departure from conventional gauges, :Cr exhibits prolongation lifetime T state correlated with increasing pressure. The advantages extend beyond sensitivity, encompassing three‐fold surge intensity escalation ambient GPa, coupled minimal susceptibility temperature‐induced Unquestionably, showcases remarkable manometric performance, validating its significant application potential diverse scenarios within realm sensors.
Язык: Английский
Процитировано
12
Advanced Optical Materials, Год журнала: 2023, Номер 12(2)
Опубликована: Авг. 26, 2023
Abstract Ultra‐broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) have great application prospects in research and industrial fields. However, simultaneously achieving highly efficient ultra‐broad NIR emission phosphor material remains a challenge. Herein, an ultra‐broadband the range of 800–1200 nm with ultra‐high efficiency up to 64.2% is first achieved by substituting Sc 3+ site Cs 2 NaScCl 6 perovskite single‐crystal Cr ion. By combining experimental results first‐principles calculations, charge transfer sensitization process from host found be fundamental reason for efficiency. Benefiting excellent superior chemical resistance heat UV radiation, pc‐LED made this demonstrates potential biomedical imaging, nondestructive testing, night‐vision devices.
Язык: Английский
Процитировано
18
Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(6), С. 2184 - 2193
Опубликована: Янв. 1, 2024
Blue-excitable broadband short-wave infrared Mg 4 Nb 2 O 9 : 3%Cr 3+ ,Li + phosphors with high crystallinity and enhanced emission were innovatively developed for pc-LED applications in nondestructive safety detection, biomedical imaging, other fields.
Язык: Английский
Процитировано
6
Journal of Alloys and Compounds, Год журнала: 2023, Номер 973, С. 172927 - 172927
Опубликована: Ноя. 23, 2023
Язык: Английский
Процитировано
16
Materials Today Chemistry, Год журнала: 2024, Номер 36, С. 101963 - 101963
Опубликована: Фев. 9, 2024
Язык: Английский
Процитировано
5