Journal of Molecular Structure, Год журнала: 2024, Номер unknown, С. 140413 - 140413
Опубликована: Окт. 1, 2024
Язык: Английский
Advanced Optical Materials, Год журнала: 2024, Номер 12(16)
Опубликована: Март 14, 2024
Abstract The utilization of phosphor‐converted light‐emitting diodes (pc‐LEDs) as compact short‐wave infrared (SWIR) emitters has emerged a promising strategy for miniature SWIR spectrometers in portable devices, enabling diverse applications such nondestructive identification, bioimaging, night‐vision surveillance, and optical communication. However, discovering phosphors capable efficiently absorbing blue light emitting pure (>900 nm) remains significant challenge. Here, highly efficient thermally stable luminescence Yb 3+ upon LED excitation by employing Cr –Yb energy transfer Y 3 Ga 5 O 12 garnet is reported. prepared :Cr ,Yb phosphor exhibits intense emission spanning from 900 to 1150 nm at 438 excitation, coupled with ultra‐high internal/external quantum efficiency 80.8%/40.2% excellent thermal stability (108%@150 °C). A pc‐LED prototype fabricated incorporating the optimized commercial 450 chip, shows exceptional performance, delivering output power 92.7 mW driving current 350 mA photoelectric 21.5% 10 mA. This work opens up new avenue designing that exhibit photoluminescence demonstrating potential next‐generation high‐power sources.
Язык: Английский
Процитировано
19
Laser & Photonics Review, Год журнала: 2024, Номер 18(5)
Опубликована: Янв. 8, 2024
Abstract Near‐infrared (NIR) light sources have gained immense popularity in recent years due to their wide range of applications various fields, including spectroscopy and biomedical imaging. However, the limited emission bandwidth NIR phosphors is a significant bottleneck development. Here, novel strategy reported broaden by awakening dumb site. Na 4 M 3 Ta(PO ) 6 : Cr 3+ ( = Al , Ga In phosphor synthesized, which exhibits greatly broadened from 134 232 nm. Structural spectral analysis reveals that NaO octahedral site has severe t 2g ‐type distortion, making it for . By introducing larger at site, angular distortion decreases normal range, enabling luminescence again. Along with bandwidth, peak also redshifts 802 977 nm, giving advantages applications. Interestingly, awakened shows even better properties than original M/TaO These findings reveal insight into could potentially revolutionize design phosphors.
Язык: Английский
Процитировано
16
Chemical Engineering Journal, Год журнала: 2025, Номер 505, С. 159559 - 159559
Опубликована: Янв. 13, 2025
Язык: Английский
Процитировано
4
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
Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(15), С. 4711 - 4720
Опубликована: Янв. 1, 2024
Utilizing the effective energy transfer from Cr 3+ to Ni 2+ realize blue Light Excited Broadband NIR-II-emitting Li 2 ZnSn 3 O 8 :Cr ,Ni Phosphor.
Язык: Английский
Процитировано
8
Laser & Photonics Review, Год журнала: 2024, Номер unknown
Опубликована: Окт. 28, 2024
Abstract Cr 3+ ‐activated near‐infrared (NIR) emitting phosphors are considered as one of the most potential light‐conversion materials for NIR phosphor converted light‐emitting diodes (NIR pc‐LEDs). However, it is still a challenge single ion to achieve flat ultra‐broadband emission toward multi‐functional spectroscopy applications. Herein, chemical unit co‐substituting strategy utilized regulate crystallographic occupancy ions, and successfully realized with record wavelength 915 nm in garnet‐type Ca 3 Sc 2‐ x Hf Al Si 3‐ O 12 : y (0 ≤ 1, 0.02 0.06), together large full width at half maximum (FWHM) regulation from 130 250 nm. The relation between site occupation ions disordered [CaO 8 ], [(Sc, Hf)O 6 ] [(Si, Al)O 4 polyhedrons corresponding clarified by carefully evaluating structural evolution, Raman spectra, electron paramagnetic resonance time‐resolved lifetime spectra ions. crystal field strength investigated further clarify multi‐sites induced broadband emission. Finally, blue light pumped pc‐LED fabricated total output power 37.58 mW photoelectric conversion efficiency (PCE) 13.67%@100 mA, which realizes applications night vision imaging, non‐destructive detection palmprint vein recognition assistant medical treatment.
Язык: Английский
Процитировано
7
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(42), С. 57316 - 57324
Опубликована: Окт. 11, 2024
Here, near-infrared broad dual-band emission phosphors were achieved through energy transfer between Cr3+ and Ni2+ ions in the β-Ga2O3 host. All samples co-doped with exhibit covering 600–1700 nm under 430 excitation. Thanks to doping of ions, intensity Ga2O3:Cr3+, has increased by about 2.4 times internal quantum efficiency 83.2% compared Ga2O3:Ni2+ phosphors. Meanwhile, when fluorescence lifetime was monitored at 745 nm, an efficient host verified. Due significant differences temperature-sensitive properties a thermometer designed utilizing ratio technology, achieving maximum relative sensitivity 5.26% K–1, which surpasses most optical temperature measurement This suggests that hold promise as potential candidates for materials. Additionally, broadband sample been investigated applications component analysis night vision, demonstrating its versatility multifunctional applications.
Язык: Английский
Процитировано
5
Ceramics International, Год журнала: 2024, Номер unknown
Опубликована: Сен. 1, 2024
Язык: Английский
Процитировано
3
Laser & Photonics Review, Год журнала: 2025, Номер unknown
Опубликована: Апрель 2, 2025
Abstract Yb 3+ is regarded as an efficient near‐infrared‐II (NIR‐II) emitting activator, which has been widely used in energy conversion, up‐conversion luminescence and optical communication. However, the simple level structure of makes it can only be excited by ultraviolet or infrared light, limits their application currently booming phosphor converted NIR‐II light diodes (NIR‐II pc‐LEDs). Here, “Eu 2+ bridge” strategy presented to largely extend absorption visible range, successfully realize pumped emission via transfer from Eu . Meanwhile, balance valence state reduced oxidized , pre‐prepared EuS precursor instead 2 O 3 significantly increases 6 times. Detailed enhancement mechanism are discussed. Finally, a pc‐LED fabricated with photoelectric efficiency 12.61%@50 mA output power 74.09 mW@300 mA. Subsequently, miniaturized real‐time test system integrated based on convolutional neural network technology accurate predict organic solvents different concentrations. This study not introduces new light‐excited ‐doped phosphors, but also promotes innovative NIR spectroscopy technology.
Язык: Английский
Процитировано
0
Journal of Alloys and Compounds, Год журнала: 2024, Номер unknown, С. 177826 - 177826
Опубликована: Ноя. 1, 2024
Язык: Английский
Процитировано
2