Highly Efficient and Thermally Stable NIR‐Emitting Phosphor with Largely Tunable Peak Wavelength and Bandwidth Toward NIR Spectroscopy Applications

Laser & Photonics Review, Год журнала: 2025, Номер unknown

Опубликована: Фев. 21, 2025

Abstract Developing tunable broadband near‐infrared (NIR) fluorescent materials with outstanding luminescence properties and superior thermal robustness remains a significant challenge for next‐generation intelligent NIR light sources. Herein, high‐performance large‐scale NIR‐emitting garnet‐type phosphor, SrLu 2 Al 3 ScSiO 12 :Cr 3+ (SLASSO:Cr ), is presented. Upon 450 nm blue excitation, SLASSO:1%Cr phosphor yields emission full width at half maximum of 108 prominent sharp peak 694 superimposed on radiation, which attributed to the co‐occupation Cr ions dominant [AlO 6 ] octahedral site (Cr1 site) subordinate [ScO (Cr2 site). Remarkably, as ⁺ content increases, red‐shift in wavelength spanning from 785 bandwidth broadening 89 152 are observed, stems weakening crystal field strength energy redistribution within Cr1 Cr2 centers regulated by formation local ‐Cr ion pairs. Notably, optimal sample boasts an excellent internal quantum efficiency 89.4% exceptional stability (97.6%@423 K). Additionally, fabricated phosphor‐converted light‐emitting diode devices demonstrate promising multi‐functional applications, including plant cultivation, night vision, bioimaging non‐destructive detection.

Язык: Английский

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Efficient and thermally-stable NIR-emitting Ca2AlTaO6:Cr3+ phosphors with excellent responsiveness to phytochrome PFR for plant growth LEDs

Materials Today Chemistry, Год журнала: 2025, Номер 46, С. 102695 - 102695

Опубликована: Апрель 15, 2025

Язык: Английский

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CaLu₂Sc₂Al₂SiO₁₂:Ce³⁺ Green Phosphors for High-Quality White LEDs

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Phosphors with broadband green emission are highly desirable for the construction of high-color-rendering warm-white light-emitting diode (LED) devices toward healthy solid-state lighting applications. However, most reported phosphors subject to an undesirable bandwidth and low quantum efficiency. Here, a efficient green-emitting garnet phosphor, CaLu2Sc2Al2SiO12:Ce3+ (CLSASO:Ce3+), is successfully synthesized investigated in detail. Upon excitation 440 nm blue light, as-synthesized CLSASO:3%Ce3+ phosphor features wide maximum peak situated at 534 large full width half-maximum (fwhm) 114 nm, which superior commercial LuAG:Ce3+ (fwhm = 108 nm). As expected, optimal sample also demonstrates satisfactory internal/external efficiency 78.3/50.1%, along suitable CIE color coordinates (0.3462, 0.5496). Meanwhile, temperature-dependent spectra measurements indicate that it retains 46% original integral intensity 423 K against room temperature, together excellent stability 9.2 × 10-3. Finally, fabricated blue-light-pumped prototype LED device proposed component another CaAlSiN3:Eu2+ red delivers brilliant light rendering index (Ra 90.2), acceptable temperature 4047 luminous 65.6 lm W-1. The findings illustrate blue-light-excitable luminescence conversion material beneficial preparation high-quality general

Язык: Английский

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Improving Thermal Stability of Eu³⁺ Luminescence via High-Concentration Terbium Doping in NaGd₂Ga₃Ge₂O₁₂ Garnet

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Апрель 10, 2025

Phosphors for white light-emitting diodes (WLEDs) would suffer from inadequate luminescent thermal stability, especially at high temperatures, affecting both the reliability and lifespan of devices. Thus, development phosphors with excellent stability is a crucial task. By use high-temperature solid-state reaction method, series Tb3+ Eu3+ codoped NaGd2Ga3Ge2O12 (abbreviated as NGGGO) has been successfully synthesized. With an appropriate doping concentration Eu3+, NGGGO:Tb3+,Eu3+ can provide color tunable emissions; simultaneously, energy transfer (ET) efficiency to reach nearly 100%. Notably, high-concentration in NGGGO could induce oxygen vacancies, giving significant enhancement on luminescence. For NGGGO:60% Tb3+,1.6% phosphor, emission intensity 450 K remained even higher than that observed under room-temperature conditions. as-synthesized phosphor red converter, near-ultraviolet pumped WLED device be fabricated. Under driving current 20 mA, exhibits rendering index (CRI) ∼ 89, low correlated temperature (CCT) 4603 K, bright light CIE chromaticity coordinates (0.3569, 0.3587), which demonstrates potential application.

Язык: Английский

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Blue/blue–violet‐emitting phosphate phosphors for full‐spectrum white light‐emitting diodes

Journal of the American Ceramic Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 22, 2025

Abstract Violet light, a component of sunlight, is critical for human health, but it usually ignored in classic white light‐emitting diodes (LEDs) that are fabricated by pumping green, yellow, or red phosphors blue LEDs. To realized full‐spectrum LEDs healthy lighting, required to replace near‐ultraviolet (n‐UV) violet pump multi‐color phosphors. Herein, we reported and/or blue–violet Na 3 KMg 7 P 6 O 24 :Eu 2+ (NKMPO:Eu ) and K 1– y Sr Mg 7– Li (NKSMLPO:Eu can be efficiently excited n‐UV The NKSMLPO:Eu phosphor ( = 0.1), showing small thermal quenching, had photoluminescence quantum yield 64.9% 41.2% under 365 405 nm excitation, respectively. Full‐spectrum were obtained combining with the blue/blue–violet‐emitting other commercial phosphors, which show correlated color temperature 4285–4705 maximal rendering index 98.4. It confirms adopted as light filler producing sunlight‐like

Язык: Английский

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High-brightness and high-color-purity red-emitting Ca8MEu(PO4)7 (M = Mg and Zn) phosphate phosphors for near-UV-pumped pc-WLEDs

Materials Today Chemistry, Год журнала: 2024, Номер 43, С. 102493 - 102493

Опубликована: Дек. 30, 2024

Язык: Английский

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High-brightness Bi3+ activated Gd2GeO5 blue phosphor for white light-emitting diodes: Synthesis, characterization, and thermal stability

Ceramics International, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

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Compositionally Tuned Self-Activated Alkali Metal Vanadates for High Color Rendering White LEDs and IR Reflective Pigments

Inorganic Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 11, 2025

Phosphor-converted white light-emitting diodes (pc-WLEDs) with a supreme color rendering index (CRI) remain challenging, particularly due to the limited accessibility of efficient cyan-green-emitting phosphors in 480-520 nm emission range. Herein, novel rare earth-free Ta5+-substituted CsVO3 phosphor that exhibits VO43- charge transfer enabled cyan-green band centered at ∼520 under 370 near UV (n-UV) light is reported an internal quantum efficiency 93.9%. This profile could align well broad-band yellow-orange produce high CRI warm light. Such spectra are achieved by incorporating Cs+ ions into Rb3V5O14 system, which tunes from red orange and eventually yellow. Furthermore, absorption Rb3-xCsxV5O14 was followed energy 2p O2- 3d V5+ orbitals, resulting perceived pigment-type colors ranging yellow promising NIR reflectance. When combined strategically, they can be excited n-UV generate well-distributed impressive 89 low temperature (CCT) 4056 K. These findings suggest newly developed vanadates hold promise for use full-spectrum pc-WLEDs.

Язык: Английский

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Neighboring‐Cation Substitution Engineering Strategy toward High Performance in Near‐Infrared Light Source for Multifunctional Applications

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Abstract Efficient broadband near‐infrared (NIR)‐emitting phosphors with long‐wavelength emission peaks and high thermal stability are urgently needed as next‐generation smart NIR light sources. However, considerable challenges remain in developing high‐performing phosphors. Herein, a blue LED excitable Bi 1.8 Ga 1.2 SbO 7 : Cr 3+ (BGS: ) phosphor broad band long peak is designed synthesized. Further, strategy of neighboring‐cation substitution engineering proposed to improve the efficiency phosphor. The optimal 0.02Cr , 0.8In can generate an 700–1300 nm range full‐width at half‐maximum (FWHM) 198 nm. This has external quantum (EQE) 31.3% good 56.1% 423 K. A fabricated NIR‐LED device achieve output power 125.55 mW 300 mA photoelectric 17.45% 20 mA, demonstrating its application potential for night vision, bioimaging nondestructive detection. study offers new thoughts fulfill outstanding luminescent performances.

Язык: Английский

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A novel red-Emission Ca2LaTiAl3O12:Eu3+ phosphor with garnet structure and high stability for high-CRI white light-emitting devices

Journal of Luminescence, Год журнала: 2025, Номер unknown, С. 121217 - 121217

Опубликована: Март 1, 2025

Язык: Английский

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