Investigation on structure and photoluminescence properties of Ho³⁺ doped Ca₃(VO₄)₂ phosphors for luminescent devices

RSC Advances, Journal Year: 2024, Volume and Issue: 14(26), P. 18777 - 18786

Published: Jan. 1, 2024

This study focuses on the synthesis and characterization of Ho 3+ doped Ca 3 (VO 4 ) 2 phosphors for potential application in solid-state lighting technology as a green phosphor.

Language: Английский

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Full-Visible-Spectrum White LEDs Enabled by a Blue-Light-Excitable Cyan Phosphor

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(42), P. 57365 - 57376

Published: Oct. 12, 2024

Efficient blue-light-excitable broadband cyan-emitting phosphors may yield full-visible-spectrum white light-emitting diodes (WLEDs) with ultrahigh color rendering (Ra > 95). However, this requires closing the "cyan gap" in 480–520 nm region of visible spectrum, which is challenging. Herein, a well-performed garnet phosphor Ca2LuAlGa2Si2O12:Ce3+ (CLAGSO:Ce3+) reported. Under 430 excitation, optimal CLAGSO:5%Ce3+ compound exhibits cyan emission (peak, 496 nm; bandwidth, 102 nm) high internal quantum efficiency 85.6% and an excellent thermal resistance performance (69.1% at 423 K). Importantly, as-prepared provides sufficient enables filling well-known so-called between blue LED chip commercial Y3Al5O12:Ce3+ (YAG:Ce3+) yellow phosphor. Impressively, WLED device fabricated sample shows low correlated temperature (4053 K) index = 96.6), as well luminous efficacy (74.09 lm W–1). These results highlight importance blue-excited gap enabling human-centric warm devices for high-quality solid-state lighting.

Language: Английский

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CaY2Sb2(ZnO4)3:Sm3+ phosphors with high thermal stability for high CRI w-LEDs and visualization of latent fingerprints

Ceramics International, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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A novel double-perovskite structure Mg2YVO6:Sm3+ phosphor with zero thermal quenching characteristics for w-LEDs and latent fingerprint development

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121147 - 121147

Published: Feb. 1, 2025

Language: Английский

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Ultra-stable, Solution-Processable CsPbBr₃-SiO₂ Nanospheres for Highly Efficient Color Conversion in Micro Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 8(1), P. 151 - 158

Published: Nov. 22, 2022

Micro light-emitting diodes (μ-LEDs) coupled to color conversion phosphors are among the most promising technologies for future display and artificial light sources. However, current emitters suffer from excessively large particle sizes, preventing micron-scale processability, and/or low stability that hampers device lifetime. Here, we demonstrate down-conversion μ-LED based on CsPbBr3 perovskite nanocrystals directly grown inside perfectly sealed mesoporous silica nanospheres (NSs). Key this advancement is a high-throughput calcination procedure in presence of K2CO3 as selective pore sealing agent, which simultaneously produces nanocrystals, boosts their emission efficiency >87%, isolates them outer environment without causing inter-particle cross-linking or aggregation. This results size-homogeneous, finely solution-dispersible, ultra-stable, highly emissive CsPbBr3-SiO2 NSs fit technological requirements photolithographic inks uniform patterns with pixels smaller than 20 μm.

Language: Английский

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Site-Selective Occupancy Control of Cr Ions toward Ultrabroad-Band Infrared Luminescence with a Spectral Width up to 419 nm

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(47), P. 53101 - 53110

Published: Nov. 17, 2022

Infrared-emitting phosphor-converted light-emitting diodes (LEDs) are desirable light sources for a very wide range of applications such as spectroscopy analysis, nondestructive monitoring, covert information identification, and night-vision surveillance. The most important aspect infrared emitters is to cover the widest possible wavelength emitted light. However, developing ultrabroad-band based on converter technology still challenging task due lack suitable phosphor materials that emit in upon excitation from blue-emitting chips. Herein, this work demonstrates Cr3+-activated Mg2SiO4 phosphors with super spectral 600 1400 nm high internal quantum yield up 80.4% 460 excitation. Site-selective occupancy Cr3+ two different Mg sites lattice results distinct broad emission bands peaking at 760 970 nm, both which contribute luminescence full width half maximum (FWHM) 419 nm. This by far broadest best our knowledge. On basis, an LED prototype has been fabricated combination Mg2SiO4:Cr3+ blue chip, shows great potential imaging sensing applications. site-selective control Cr ions effective strategy Cr3+-doped phosphors.

Language: Английский

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Facile Synthesis of Highly Efficient and Thermally Stable BaAl₄Sb₂O₁₂:Eu²⁺ Phosphor in Air

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(20)

Published: Feb. 17, 2023

Abstract Despite many Eu 2+ ‐doped phosphors having been synthesized by different methods, a simple synthetic strategy for high‐performance remains one of the significant challenges phosphor‐conversion white light‐emitting diodes. Herein, novel broad‐band excitation yellow phosphor Ba 0.985 Al 4 Sb 2 O 12 :0.015Eu (BASO:Eu ) with high thermal stability (423 K, 94%) and internal quantum efficiency (96.7%) are reported. More importantly, is solid‐state reaction at temperatures in air. Structural spectral analyses show that ions BASO preferably occupy [BaO 8 ] hexahedra, forming single luminescence center. This study provides reliable direction facile synthesis

Language: Английский

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Achieving efficient violet-light-excited blue phosphors by nitridation for violet-chip-based full-spectrum lighting

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 10(8), P. 2430 - 2437

Published: Jan. 1, 2023

By partially introducing N 3− into a matrix, new efficient and thermally stable Ba 0.697 Al 10.914 O 15.732 1.0 :0.16Eu 2+ blue phosphor has been synthesized, which can better match with violet chips for full-spectrum lighting.

Language: Английский

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Unraveling Luminescent Energy Transfer Pathways: Futuristic Approach of Miniature Shortwave Infrared Light-Emitting Diode Design

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(5), P. 2395 - 2400

Published: April 26, 2023

Phosphor-converted shortwave infrared phosphor light-emitting diodes (pc-SWIR LEDs, 900–1700 nm) are promising next-generation portable light sources for spectroscopy, security, optical communication, and medical applications. A typical design strategy involves energy transfer from Cr3+ to Ni2+, thus, Cr3+–Cr3+ pairs Ni2+ ions is important but challenging. Here, we report a Sr1–xLaxAl5.92Cr0.08Ga6–xO19:xNi2+ (x = 0–0.09) series the SWIR emissions range of 900–1600 nm due an pair Ni2+. Short-range structural studies using electron paramagnetic resonance magnetometry measurements reveal that likely exist as isolated Cr3+–Ni2+ rather than forming Ni2+–Ni2+ pairs. The fabricated prototype pc-LED delivers radiant flux 12.43 mW under 350 mA driving current. This work provides insights into codopant phosphors.

Language: Английский

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Cr³⁺-Doped NIR Phosphor with Well-Defined Stokes/Anti-Stokes Phonon Sidebands for a Ratiometric Thermometer and Thermally Stable NIR LEDs

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(10), P. 3968 - 3975

Published: May 9, 2023

Near-infrared (NIR) luminescent materials have attracted enormous attention for the cutting-edge applications in optical thermometer and NIR LEDs. Herein, we report a highly efficient Cr3+-doped phosphor, BaAl4Sb2O12:0.024Cr3+ (BASO:Cr3+), with 91% internal quantum efficiency. Strikingly, BASO:Cr3+ possesses rare typical Stokes/anti-Stokes phonon sidebands. The Stokes sideband decreases increasing temperature, while anti-Stokes one increases considerably. Consequently, this inverse change has gifted excellent thermal stability, which maintains 118% of room temperature emission intensity at 423 K. In addition, well-defined sidebands are applied to ratiometric maximum relative sensitivity factor 3.12% K–1 150 Finally, well-performing LED is made BASO:Cr3+, can be used nondestructive testing, information encryption, night vision. Our findings not only shed light on behavior Cr3+ but also point out an avenue thermally stable phosphors sensitive thermometer.

Language: Английский

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