Achieving broadband near-infrared luminescence in Cr3+-Activated Y2Mg2Al2Si2O12 phosphors via multi-site occupancy

Advanced Powder Materials, Journal Year: 2024, Volume and Issue: 3(3), P. 100186 - 100186

Published: March 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

Language: Английский

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Novel GdAlGe2O7:Bi3+,Eu3+ phosphors with anti-thermal quenching properties for high sensitivity optical temperature measurement

Materials Today Physics, Journal Year: 2024, Volume and Issue: 43, P. 101391 - 101391

Published: March 6, 2024

Language: Английский

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Directly Identifying Multiple Cr³⁺ Emitting Centers for Broad Near‐Infrared Emission in an Efficient and Near‐Zero Thermal Quenching Garnet‐Type Phosphor

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(11)

Published: Feb. 8, 2024

Abstract Cr 3+ doped garnet‐type (A 3 B 2 C O 12 ) near‐infrared (NIR) phosphors is a desirable research hotspot due to their prospective night vision, bioimaging, and plant growth utilizations. Meanwhile, the origin of multisite broad emission yet controversial topic. To resolve trouble, verifying accurately multiple occupancy sites key. Furthermore, it an urgent need for improving external quantum efficiency luminescent thermostability. Herein, in Y Sc Al (YSAO), advanced electron microscopy technique employed directly confirm that obtained broadband NIR originates from [ScO 6 ] octahedral [YO 8 dodecahedral sites. The optimal YSAO:5%Cr sample exhibits high (IQE/EQE = 74/31%) near‐zero thermal quenching (97%@423 K 92%@473 K). theoretical calculations experimental proofs reveal YSAO possesses structural rigidity wide bandgap, which responsible extremely thermostable luminescence. high‐power ‐converted LED device shows promising multifunctional applications. This work not only provides efficient phosphor with quenching, but also effective determination method emitting centers materials.

Language: Английский

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Continuous Ultra‐Broadband Near‐Infrared Sc₂O₃‐Based Nanophosphor Realized by Spectral Bridge of Cr³⁺‐Yb³⁺‐Cr⁴⁺ for Multiple Optical Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(19)

Published: June 20, 2023

Abstract Cr 3+ ‐activated near‐infrared (NIR) phosphors are one of the most influential candidates for new generation intelligent NIR phosphor‐converted light‐emitting diode (pc‐LED) light sources. For spectral analysis, broader spectrum, more useful information it contains. Herein, ultra‐broadband Cr‐activated Sc 2 O 3 nanophosphors, which exhibit from 650 to 1600 nm, developed by sol–gel method. This emission originates presence and 4+ , two luminescent centers confirmed diffuse reflection spectra, electron paramagnetic resonance, time‐resolved photoluminescence temperature‐dependent spectra. The nanophosphor exhibits excellent temperature‐sensing performance with S A = 4.102% K −1 R 1.855% . Co‐doping Yb into nanophosphors builds ‐Yb ‐Cr model bridge gap located at 1000 forming a continuous spectrum ranging nm first time. Moreover, introduction improves thermal stability 29.49% 50.65% 150 °C. transmission spectra water, ethanol, peanut oil demonstrate that :Cr favor potential applications in analysis. construction realizing based on cheap blue LEDs provides novel effective insights.

Language: Английский

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Stimuli‐Responsive Lanthanide Activated Piezoelectric LiNbO₃ Microcrystals for Multimode Luminescence and Optical Sensing Applications

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(6)

Published: Feb. 13, 2024

Abstract Multimode luminescence is usually stimulated by various external stimuli in response to photon emission and applied anti‐counterfeiting encryption fields. However, integrating multimode into a single stable material, how quantitatively evaluate the relationship between temperature light force remains challenge. In this work, LiNbO 3 :Er 3+ /Pr microcrystals that can respond X‐ray, UV light, temperature, stress are developed. The temperature‐dependent upconversion spectra show maximum relative sensitivity of 0.889% K −1 based on intensity ratio. Meanwhile, mechanoluminescence around 618 nm with linear observed increase force. These materials illustrate strong static dynamic be manipulated space time dimensions, which provides new ideas field information encryption.

Language: Английский

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Highly thermally stable SrLaMgTaO6: Cr3+ double-perovskite phosphors for night-vision applications

Ceramics International, Journal Year: 2024, Volume and Issue: 50(16), P. 28707 - 28714

Published: May 12, 2024

Language: Английский

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An Efficient Perovskite‐Like Phosphor with Peak Emission Wavelength at 850 nm for High‐Performance NIR LEDs

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 11(4)

Published: Dec. 16, 2022

Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are an emerging light source demanded for the miniaturization of NIR spectroscopy. However, photoelectric efficiency and spectral properties pc‐LEDs still very limited due to a lack efficient broadband phosphors with peak emission wavelength >850 nm. Here, novel Cr 3+ ‐activated perovskite‐like Mg 4 Ta 2 O 9 phosphor is reported, which exhibits broad band peaking at 850 nm high internal (external) quantum 72% (33.4%). The fabricated pc‐LED shows covering whole 700–1100 spectrum range conversion 22.1% 10 mA. This work may provide new paradigm discovery singly doped excellent performance.

Language: Английский

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Synthesis of Bi3+ and Eu3+ co-doped Na4CaSi3O9 blue-red light tunable emission phosphors for inducing plant growth

Ceramics International, Journal Year: 2023, Volume and Issue: 50(6), P. 9058 - 9069

Published: Dec. 17, 2023

Language: Английский

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Tailoring Ultra‐Wide Visible‐NIR Luminescence by Ce³⁺/Cr³⁺/Yb³⁺‐alloying Sc‐Based Oxides for Multifunctional Optical Applications

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(15)

Published: Jan. 28, 2024

Abstract Visible‐to‐near‐infrared (VIS‐NIR) luminescent materials are in great demand the field of non‐destructive testing such as component determination and hyperspectral imaging. Although Cr 3+ ‐activated phosphors widely reported, controllable tailoring ultra‐wide VIS‐NIR luminescence excited by blue light is still a challenge. The strategies cationic substitution energy transfers effective for adjusting phosphors. In this work, series ‐doped Sc‐based solid solution (Ba 3‐m Sr m Sc 4 O 9 :Cr ) reported. Under excitation light, these exhibit broadband emission due to different centers induced occupying sites. Because weaker crystal strength, realizes with longer peak position (λ em = 820 nm) broader full width at half maximum (FWHM≈182 Ba 2 SrSc . Furthermore, Ce /Yb ions introduced into , achieving an (460–1200 →Cr →Yb multiple transfers. Designing beneficial improve quantum efficiency weaken thermal quenching. Finally, NIR phosphor‐converted light‐emitting diode (pc‐LED) fabricated demonstrates potential night‐vision water detection. This work provides design idea chemical transfer.

Language: Английский

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Multi-Mode Luminescence in Smart Near-Infrared Cr³⁺/Pr³⁺ Codoped SrGa₁₂O₁₉ Phosphors Induced by Three Distinct Excitation Mechanisms

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(26), P. 33855 - 33864

Published: June 20, 2024

Near-infrared (NIR) phosphors have emerged as novel luminescent materials across various fields due to their unique advantages of high penetration and invisibility. However, there is currently a lack intelligent NIR that can achieve multimode stimuli responsive for sensing applications. In this study, we employed high-temperature solid-phase reaction incorporate Pr3+ into Cr3+-doped gallate magnetite SrGa12O19 phosphor, yielding phosphor. Also, the inherent cation vacancies defects in matrix, material not only exhibits brighter photoluminescence but also distinct mechanoluminescence at lower load. Notably, Pr3+-doped SrGa12O19:Cr3+ demonstrates extended persistent luminescence thermoluminescence effects. Finally, combined phosphor with blue LED chip develop new multifunctional pc-LED. Leveraging NIR's penetrating ability, it persist biological tissues prolonged periods, enabling optical inspection offering approach password protection anticounterfeiting measures. This solution significantly expands application potential light food quality assessment analysis.

Language: Английский

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