Highly‐Efficiency Far‐Red Emission in Cr³⁺ Activated Ca_1.8Mg_1.2Al₂Ge₃O₁₂ toward Plant Precise Lighting

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)

Published: Feb. 25, 2024

Abstract Far‐red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high‐performance Cr 3+ ‐doped FR phosphors. This study developed phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr (CMAGG: ), using the cation substitution strategy. Under 438 nm blue light excitation, phosphors display emission centered at 720 with full width half maximum (FWHM) of 91 nm. Benefit from favorable match phytochrome (P fr phosphor is combined InGaN chips create phosphor‐converted light‐emitting diode (pc‐LED), which used in Italian lettuce growth experiments and results shown 15% increase fresh weight 6.5% dry weight. Notably, supplemental modulated its morphology. The this will be useful further research on novel meet precise spectral requirements growth.

Language: Английский

---

Interstitial Oxygen-Driven Far-Red/Near-Infrared Emission and Efficiency Enhancement via Heterovalent Cation Substitution in Ca₃WO₆ Phosphors

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

In this work, Ca3WO6 (CWO) phosphors were successfully synthesized using a high-temperature solid-state method, exhibiting an anomalous far-red/near-infrared (FR-NIR) emission centered at 685 nm. The origin of FR-NIR is confirmed through Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), density functional theory (DFT) calculations, and heterovalent cationic substitution (Y3+/Na+ → Ca2+). These analyses indicate that interstitial oxygen (Oi) defects within the lattice are primarily responsible for emission. Y3+ Ca2+ increases concentration Oi, significantly enhancing intensity. This results in increase internal quantum efficiency (IQE) increasing from 12.8 to 90.9%, realizing efficient self-activated phosphors. Furthermore, CWO demonstrate unique dual-band characterized by blue 435 nm endows with multifunctional applications plant growth lighting, nondestructive testing, night vision fields.

Language: Английский

---

A Phase‐Transition–Free Sodium Vanadium Phosphate Cathode via Medium‐Entropy Engineering for Superior Sodium Ion Batteries

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Abstract Na 3 V 2 (PO 4 ) , based on multi‐electron reactions between 3+ /V 4+ 5+ is a promising cathode material for SIBs. However, its practical application hampered by the inferior conductivity, large barrier of and stepwise phase transition. Herein, these issues are addressed constructing medium‐entropy (Na 3.2 1.1 Ti 0.2 Al Cr Mn Ni 0.1 ME‐NVP) with strong ME─O bond highly occupied Na2 sites. Benefiting from effect, ME‐NVP manifests phase‐transition–free reaction mechanism, two reversible plateaus at 3.4 (V 4.0 ), small volume change (2%) during + insertion/extraction processes, as confirmed comprehensive in/ex situ characterizations. Moreover, kinetics analysis illuminates superior diffusion ability ME‐NVP. Thus, realizes remarkable rate capability 67 mA h g −1 50C long‐term lifespan over 10 000 cycles (capacity retention 81.3%). Theoretical calculations further illustrate that weak binding ion in channel responsible rapid diffusion, accounting kinetics. rigid MEO 6 octahedral feasible rearrangement ions can suppress transition, thus endowing an ultrastable cathode. This work highlights significant role engineering advancing output voltage, cycling stability, polyanionic cathodes.

Language: Английский

---

Site occupation engineering induced red-shifted luminescence in (Ca, Sr)Sc2O4:Eu2+ phosphor

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

Published: Feb. 1, 2025

Language: Английский

---

Crystal Field-Engineered Cr³⁺-Doped Gd₃(Mg_xGa_5–2xGe_x)O₁₂ Phosphors for Near-Infrared LEDs and X-ray Imaging Applications

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(28), P. 12886 - 12893

Published: July 1, 2024

Inorganic materials doped with chromium (Cr) ions generate remarkable and adjustable broadband near-infrared (NIR) light, offering promising applications in the fields of imaging night vision technology. However, achieving high efficiency thermal stability these NIR phosphors poses a significant challenge for their practical application. Here, we employ crystal field engineering to modulate characteristics Cr3+-doped Gd3Ga5O12 (GGG). The Gd3MgxGa5–2xGexO12 (GMGG):7.5% Cr3+ (x = 0, 0.05, 0.15, 0.20, 0.40) emission are developed through cosubstitution Mg2+ Ge4+ Ga3+ sites. This strategy also effectively reduces strength around ions, which results enhancement photoluminescence (PL) full width at half-maximum (fwhm) from 97 165 nm, alongside red shift PL peak an intensity up 2.3 times. Notably, behaviors is improved. demonstrate potential biological tissue penetration vision, as well exceptional scintillation performance scintillator imaging. research paves new perspective on development high-performance technology light-emitting diodes (LEDs) X-ray applications.

Language: Английский

---

Crystallographic Engineering to Develop Ultra‐Narrow‐Band Cyan‐Emitting UCr₄C₄‐Type Phosphor for Healthy LED Lighting and Display

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(11)

Published: June 18, 2024

Abstract Narrow‐band cyan‐emitting materials for white light‐emitting diode (wLED) application have shown great potential in increasing the maximum accessible display gamut and improving color rendering of full‐spectrum healthy lighting. However, discovery novel narrow‐band cyan emitters with excellent luminescence performances remains challenging. Here, an ultra‐narrow‐band Na 5 K 3 (Li SiO 4 ) 8 :Eu 2+ (N phosphor (λ em = 483 nm) full width at half (FWHM) only 18 nm is developed from some typical UCr C frameworks phosphors by slightly modifying crystal structure symmetry. Through controllable regulation ratio 6 2 to N , lattice sites forming shoulder peaks are further squeezed generate narrowest emission. Moreover, exhibits low photoluminescence thermal quenching (90%@150 °C) high internal quantum efficiency (IQE) 50%. The index wLED health lighting enhanced 92 94. Using this short‐wavelength emission instead a part blue chip can effectively prevent “blue hazard”. This work provides basic principles design phosphors, thus achieving their applications fields eye‐friendly display.

Language: Английский

---

Fine‐Tuning of Near‐Infrared Emission in Fe‐Activated Spinel Phosphors via the Synergistic Effect of Sites Inversion and Atomic Disorder

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 3, 2024

Abstract Achieving continuous tunability, high efficiency, and outstanding thermal stability of near‐infrared (NIR) phosphors remains challenging for optoelectronic device fields. To address this issue, a strategy is proposed based on the substitution both cations anions in intermediate spinel structure, which successfully achieved fine‐tuning NIR emission Mg 1+y Ga 2‐y O 4‐y F y :Fe 3+ with prominent optical characteristics. The contains new luminescent centers random O/F coordination constructed. This co‐substitution promotes further inversion cationic sites induces atomic disorder, changing crystal environment making Fe breakthrough Laporte selection rule, enabling emissions range 707–740 nm broadening full width at half maximum by 30 nm. Moreover, 1.15 1.85 3.85 0.15 phosphor reached quantum yield 71.6% presented excellent an intensity retention 81% 493 K. fabricated phosphor‐converted light‐emitting diodes also matched well photosensitive pigment P fr , demonstrating its feasibility plant growth lighting applications.

Language: Английский

---

Compositional engineering of phase-stable and highly efficient deep-red emitting phosphor for advanced plant lighting systems

Light Science & Applications, Journal Year: 2024, Volume and Issue: 13(1)

Published: Dec. 11, 2024

Inorganic luminescent materials hold great promise for optoelectronic device applications, yet the limited efficiency and poor thermal stability of oxide-based deep-red emitting phosphors hinder advancement plant lighting technologies. Herein, a simple compositional engineering strategy is proposed to stabilize phase, boost external quantum (EQE) enhance stability. The chemical modification PO

Language: Английский

---

Site Substitution Triggered Luminescence Characteristics Modulation in Eu³⁺‐Activated Sr₄La₆(SiO₄)₆Cl₂ Phosphors for Boosting Viral Resistance and Plant Growth

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

Abstract A series of Eu 3+ ‐activated Sr 4 La 6 (SiO ) Cl 2 (SLSCl) phosphors are prepared to fulfill the requirements plant growth and immunity. Upon 394 nm excitation, resulting can emit intense red emission from , which their intensities sensitive dopant content site occupation. When occupies 2+ sites, its optimal doping contents in SLSCl host lattices is 40 50 mol%, respectively. Moreover, quantum efficiency thermal stability designed also greatly dependent on taken by lattices. Via utilizing as red‐emitting converters, two different light‐emitting diodes (LEDs) fabricated, whose bands overlap with absorption pigments, enabling feasibilities growth. Furthermore, experiments indicate that photosynthesis be significantly improved via employing packaged LEDs supplementary lights. Additionally, enhance resistance N. benthamiana plants against viral infection. The findings do not only propose a facile route manipulate luminescence properties phosphors, but confirm utilization light an efficient promote resistance.

Language: Английский

---

Employing high efficiency Gd3Ga2Al3O12:Cr3+ phosphor glass films to enhance the long-term operating stability of high-power LED plant lighting device

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121101 - 121101

Published: Jan. 1, 2025

Language: Английский

---