Regulating Eu²⁺ Multisite Occupation through Structural Disorder toward Broadband Near-Infrared Emission

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(3), P. 1432 - 1439

Published: Jan. 27, 2023

To promote the development of near-infrared (NIR) light sources in optoelectronic and biomedical applications, discovery NIR-emitting phosphor materials their design principles are essential. Herein, we report a novel Eu2+-activated broadband phosphor, BaSrGa4O8:Eu2+, which features multisite occupation due to Ba/Sr oxygen site occupancy disorder. With an increase atomic ratio from 1:1 1.7:0.3, Eu2+ emission band maximum red-shifts 670 775 nm, along with enlargement full width at half-maximum (FWHM) 140 230 nm. The underlying mechanism for structure–property relationship is elucidated using density functional theory calculations. application NIR phosphor-converted light-emitting diodes (pc-LEDs) demonstrated, showing potential night-vision technology. Our results can initiate further exploitation host structural disorder toward luminescence applications pc-LEDs.

Language: Английский

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Improving and broadening luminescence in Gd_2−xAl_xGaSbO₇:Cr³⁺ phosphors for NIR LED applications

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 10(7), P. 2197 - 2205

Published: Jan. 1, 2023

Enhanced and broadened NIR luminescence was realized in a Gd 2− x Al GaSbO 7 :Cr 3+ phosphor by → cation substitution. Its application as an emitting converter for LEDs confirmed.

Language: Английский

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Recent progress on modulating luminescence thermal quenching properties of Bi³⁺-activated phosphors

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(6), P. 1668 - 1682

Published: Jan. 1, 2024

Four design strategies for modulating the luminescence thermal quenching properties of Bi 3+ -activated phosphors are proposed: (1) defect engineering; (2) structural modulation; (3) lattice structure rigidity; and (4) energy transfer.

Language: Английский

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Exploring innovative applications of Sr2MgSi2O7:Fe3+ luminescent system in surface-triggered fingerprint divergence and cheiloscopy screening

Materials Today Sustainability, Journal Year: 2024, Volume and Issue: 26, P. 100788 - 100788

Published: May 1, 2024

Language: Английский

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A Robust Anti-Thermal-Quenching Phosphor Based on Zero-Dimensional Metal Halide Rb₃InCl₆:xSb³⁺

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(11), P. 7658 - 7667

Published: March 7, 2024

High-power phosphor-converted white light-emitting diodes (hp-WLEDs) have been widely involved in modern society as outdoor lighting sources. In these devices, due to the Joule effect, high applied currents cause operation temperatures (>500 K). Under conditions, most phosphors lose their emission, an effect known thermal quenching (TQ). Here, we introduce a zero-dimensional (0D) metal halide, Rb3InCl6:xSb3+, suitable anti-TQ phosphor offering robust behavior up 500 K. We ascribe this of halide two factors: (1) compensation process via thermally activated energy transfer from structural defects emissive centers and (2) intrinsic rigidity isolated octahedra 0D structure. The phosphor-based WLEDs can stably work at current 2000 mA. low synthesis cost nontoxic composition reported here herald new generation for hp-WLED.

Language: Английский

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Blueshift and Photoluminescence Enhancement in Broadband Near‐Infrared Emitting Phosphor NaSr₂(Al/Ga)Ge₅O₁₄: Cr³⁺ Dependence on the Sc/In Substitution

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(13)

Published: Jan. 26, 2024

Abstract Cr 3+ ‐activated near‐infrared (NIR) phosphors have gained extensive attention for use in NIR phosphor‐converted light‐emitting diodes (pc‐LEDs), which are required smart spectroscopy techniques. Nevertheless, obtaining broadband NIR‐emitting with outstanding thermal stabilities and photoluminescence (PL) efficiencies remains a significant challenge. Herein, considering NaSr 2 XGe 5 O 14 (X = Al, Ga, Sc, In) as hosts, possess large band gap multiple sites the substitution of ions. :Cr successfully prepared using solid‐state reaction technology. Upon blue light excitation, cover broad emission 650–1100 nm region. Notably, an abnormal blueshift PL enhancement observed following Al/Ga Sc/In. In particular, internal quantum efficiency is improved from 34.5% (NaSr GaGe : ) to 87.5% ScGe ). Moreover, manufactured pc‐LED exhibited exceptional photoelectric 17.7% output power 10.2 mW at 20 mA, its potential application nondestructive detection demonstrated.

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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Near‐Infrared Windows I and II Phosphors for Theranostic Applications: Spectroscopy, Bioimaging, and Light‐Emitting Diode Photobiomodulation

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

Published: Dec. 19, 2022

Abstract The importance and practicality of near‐infrared (NIR) light for the biomedical field has attached to academe industry with development technology. Luminescent materials different doping strategies are promising candidates covering biological windows from 700 nm 1 nm. relationship between NIR light, nanophosphors, tissue towards function diagnostic therapy in is explored clearly, which corresponds diffuse reflection spectroscopy bioimaging light‐emitting diode (LED) photobiomodulation. diseases can be monitored specific chromophore absorption under source, also traced dynamic change environment by luminescent materials. Especially brain diseases, cytochrome c oxidase mitochondria as crucial photoreceptor activated irradiation achieve non‐invasive treatment neuron protection recovery. attributed LED or nanophosphors show potential theranostic approaches Cr 3+ ‐ Ni 2+ ‐activated phosphors I II presented optical properties explore feasibility practicability precise medical future.

Language: Английский

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Sc3+-induced double optimization strategies for boosting NIR-II luminescence and improving thermometer performance in CaF2: Nd3+, Nd3+/Yb3+@NaYF4 nanocrystals

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 452, P. 139133 - 139133

Published: Sept. 11, 2022

Language: Английский

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Cr³⁺-Doped double perovskite antimonates: efficient and tunable phosphors from NIR-I to NIR-II

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 9(18), P. 4602 - 4607

Published: Jan. 1, 2022

By tuning cationic compositions, Cr 3+ -doped antimonate double perovskites present emissions from NIR-I to NIR-II regions. In particular, Ca 2 ScSbO 6 :Cr and Sr InSbO feature long-wavelength with high luminescence efficiency.

Language: Английский

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