Enhancing External Quantum Efficiency of Blue-Emitting Phosphor Ba(K)-β-Al₂O₃:Eu²⁺ by Lattice Site Engineering for Full-Spectrum Lighting

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(25), P. 10021 - 10028

Published: June 13, 2023

The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, application most known phosphors limited by their low external quantum efficiency (EQE). In this work, we reported on how EQE values Eu2+-doped Ba(K)-β-Al2O3 can be significantly improved through lattice site engineering. By partially substituting K+ Ba2+, Eu2+-occupied crystallographic changes and coordination polyhedron Eu2+ shrinks, leading to increase crystal field splitting. Consequently, excitation spectrum exhibits continuous red shift match violet excitation, which enhances PL intensity solid solution (Ba0.4K1.6)0.84Al22O35-α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) 1.42 times compared that end-member Ba1.68Al22O35-α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under 400 nm light optimal (B0.4K1.6)0.84AO:Eu up 53%. Additionally, also shows excellent resistance luminescence thermal quenching (95% at 150 °C). Finally, WLED fabricated based commercial green exhibited an ultra-high color rending index with Ra = 95.5 R1-R15 >90. This work offers guidance tuning spectral properties

Language: Английский

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Highly Quantum Efficient and Thermally Stable Near‐Infrared‐Emitting K‐β‐Al₂O₃:Cr³⁺ Phosphor

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(4)

Published: Aug. 31, 2023

Abstract Near‐infrared (NIR) phosphors are enablers for NIR phosphor‐converted light‐emitting diodes (pc‐LEDs). However, fewer NIR‐emitting with both high internal/external quantum efficiency (IQE/EQE) and thermal stability discovered, which obstructs the promotion of pc‐LEDs. Herein, by partially replacing Al 3+ in K‐β‐Al 2 O 3 :2Cr Ga , photoluminescence (PL) intensity solid solution K 1+δ (Al 0.4 0.6 ) 11 17 (KA G O:Cr) phosphor is increased 2.75 1.25 times that end‐members (KAO:Cr) (KGO:Cr). The IQE/EQE optimal KA O:Cr reaches 88.9%/50.8% (77.4%@150 °C). PL enhancement due to Al/Ga‐6O octahedral volume distortion variation caused substitution 1‐y ,Ga y O:Cr), leads forbidden d–d transition being broken crystal field strength varied. Finally, a pc‐LED device fabricated based on blue chip an electro‐optical 16.3% under drive current 100 mA. Meanwhile, non‐destructive detection plant germination applications demonstrated. These results prove promising diverse applications.

Language: Английский

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Structure tailoring and defect engineering of a highly thermally stable red emitting phosphor

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(12), P. 4287 - 4295

Published: Jan. 1, 2024

Gd 3− y Ca −0.02 GaO 6 :0.02Eu 2+ ( = 0.2) can produce 650 nm red light with a half-peak width of 68 nm, and its emission intensity still maintain more than 95% that at room temperature.

Language: Английский

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Manipulating cationic ordering toward highly efficient and zero-thermal-quenching cyan photoluminescence

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 490, P. 151727 - 151727

Published: April 27, 2024

Language: Английский

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Advances in Fe3+-activated luminescent materials for near-infrared light sources

Progress in Solid State Chemistry, Journal Year: 2024, Volume and Issue: 74, P. 100456 - 100456

Published: April 4, 2024

Language: Английский

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

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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

Language: Английский

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Efficient Blue–Violet Phosphor with Small Stokes‐Shift for Full‐Spectrum Lighting

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(12)

Published: Oct. 16, 2023

Abstract Blue–violet phosphor is an essential component to realize full spectrum lighting on the basis of commercial 365 nm N‐UV chip excitation. However, its development falls behind since with small stokes‐shift ( ΔS ) hard realize. Herein, a new blue–violet SrSc 4 Si 5 O 17 :Ce 3+ (∼30 nm) presented. emits bright luminescence peaking at 390 nm, and internal/external quantum efficiency can reach 73.4%/50.4% under The unique performance related closely crystal structure. host‐referred bind energy (HRBE) diagram also successfully constructed illustrate thermal quenching behavior. Finally, packaged white light‐emitting diodes based chip, , other high‐performance phosphors have ultra‐high color rendering index R = 95.9), indicating that potential candidate for various applications, including indoor healthy agricultural lighting.

Language: Английский

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Progress of Ce³⁺/Eu²⁺ doped phosphors for violet chip based full-spectra lighting

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(30), P. 11209 - 11241

Published: Jan. 1, 2024

The research progress of Ce 3+ /Eu 2+ doped phosphors that can be excited by violet light, including the structural models, composition regulation, and spectral tuning, is summarized.

Language: Английский

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Preparation of a novel violet-excitable Na₃YSi₂O₇:Eu²⁺ green phosphor via salt-flux assistance and its luminescence properties

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(20), P. 7435 - 7445

Published: Jan. 1, 2024

A novel violet-excitable Na 3 YSi 2 O 7 :Eu 2+ green phosphor for a high-quality white LED was developed via salt-flux assistance.

Language: Английский

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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

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