Synthesis process dependent white LPL in Zn2GeO4 ceramic and the long afterglow mechanism

Duan, Xiaoxia; Yuan, Man; Ou, Kai; Duan, Wubiao; Lü, Yi; Zhang, Xiqing

doi:10.1016/j.mtcomm.2020.100915

Cited by 7 publications

(8 citation statements)

References 37 publications

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“…Figure S3a shows the double peaks at 641.2 eV and 656.8 eV correspond to the Mn 2+ 2p levels of p3/2 and p1/2, respectively, indicating that the chemical state of Mn in the doped ZGO sample exists in the form of Mn 2+ . Therefore, We further confirmed the Mn 2+ doping into ZGO fluorescent powder [35] …”

Section: Resultssupporting

confidence: 55%

“…The sharp diffraction peaks in the figure indicate that the Zn 2 GeO 4 : xMn sample has excellent crystallinity. [34,35] At the same time, the diffraction peaks show a tendency to broaden upon incorporation of Mn 2 + , which indicates that the crystallinity of the Zn 2 GeO 4 : xMn sample is slightly reduced.…”

Section: Controllable Synthesis Of Mn 2 + -Doped Zn 2 Geo 4 Nanorodsmentioning

confidence: 97%

“…Therefore, We further confirmed the Mn 2 + doping into ZGO fluorescent powder. [35] Ultraviolet-visible diffuse reflectance spectrum Figure 5a shows the UV-Vis diffuse reflectance spectrum of the ZGO sample. The ZGO host absorbs from 240 nm to 270 nm.…”

Section: Zgo : Mn 2 + X-ray Photoelectron Spectroscopymentioning

confidence: 99%

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Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

et al. 2021

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In this study, color tunable phosphors (Mn 2 + -doped Zn 2 GeO 4 ) were successfully synthesized by a facile microwave hydrothermal process with H 2 O as solvent. Crystal field modulation and band gap doping by Mn 2 + substitution for Zn 2 + realizes color tunable Mn 2 + emission from 424 to 535 nm. Mn 2 + -doping on the phase and size transition of Zn 2 GeO 4 nanocrystals was discussed, and a possible Zn 2 GeO 4 : xMn crystal growth mechanism is discussed. Photoluminescence (PL) spectra indicate that the d-d transition of manganese ions ( 4 T 1 ! 6 A 1 ) corresponds to a strong green emission of Zn 2 GeO 4 : xMn phosphors.

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Section: Resultssupporting

confidence: 55%

Section: Controllable Synthesis Of Mn 2 + -Doped Zn 2 Geo 4 Nanorodsmentioning

confidence: 97%

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Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

et al. 2021

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“…As illustrated in Figure F, both the PerL emissions at 515 and at 540 nm from the ZGeO phosphor last for more than 1.0 h, and the decaying rates look fairly similar for both white and green emissions. The PerL lifetime reported by Duan et al in ZGeO is less than 90 s …”

Section: Resultsmentioning

confidence: 81%

Interstitial Zinc Boosted Light Tunability, Afterglow, and Ultrabright White Emission in Zinc Germanate (Zn₂GeO₄)

Gupta

Sudarshan

Modak

et al. 2023

ACS Appl. Electron. Mater.

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To reduce the burden of solid-state lighting and phosphor-converted light-emitting diode technologies on rare earth (RE) and avoid their potential supply risks, we have developed a RE-free Zn2GeO4 (ZGeO) microcrystalline phosphor. It was synthesized by a simple and scalable solid-state reaction of ZnO and GeO2 at 1200 °C. High-temperature synthesized ZGeO demonstrated color tunable emission from bluish-white to green on changing the excitation wavelength from 265 to 335 nm with a photoluminescence quantum yield of 42 and 9%, respectively. They could also convert highly energetic X-ray to bluish-green light emission. First-principles calculations showed that bluish-white and green light emissions are linked to zinc interstitials present, respectively, in zinc (Zn i 2) and zinc–germanium rings (Zn i 1). These defects generated in large numbers via high-temperature annealing along with antisites boosted the generation of trapping centers leading to dual persistent luminescence (PerL) of white and green light for more than 60 min as well as exhibited radioluminescence. Luminescent ink based on ZGeO was fabricated and successfully tested for anticounterfeiting applications. An extra effort has been vested on making this solid-state processed ZGeO dispersible in water-soluble deep eutectic solvent which could be a game changer for its marketability. This material has great potential to become an efficient RE and dopant-free phosphor synthesized by a simple, scalable, and cost-efficient route for applications in solid-state lighting, display, and anticounterfeiting, having multifunctionalities such as PerL, tunability, and RL.

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“…[ 3 ] Most afterglow systems employ inorganic materials (e.g., ores and rare earth elements), and ultra‐high temperature forging is generally required. [ 4 ] Since most inorganic luminescent materials bear poor compatibility and applicable media, the methods based on organic systems were thus developed, the aim of which is to supervise the excited states of the luminescent components to achieve room temperature phosphorescence and long afterglow. [ 3c,5 ] The pioneering work by Adachi has introduced a simple mixture of two organic molecules, containing no rare elements and easy to fabricate and process, which paved the way for promising study on organic long persistent luminescence.…”

Section: Introductionmentioning

confidence: 99%

Radical Afterglow Emission Harnessed by Doping N,N’‐Diaryl‐5,10‐Dihydrophenazines to Epoxy Resins

Jin

et al. 2023

Advanced Optical Materials

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Developing radical‐induced afterglow emission under ambient conditions is challenging since newly formed radical species are susceptible to air and water. In this work, long afterglow materials (up to 4 s) are realized by doping a series of N,N’‐diaryl‐5,10‐dihydrophenazine (DPP)derivatives into rigid cycloaliphatic epoxy resins (CER). The afterglow is found to result from the interaction between the matrix and the excited states of the dopants through the generation of radical species under continuous UV excitation, which can be regulated by the peripheral functional groups of the N‐phenyl substituents. Density functional theory (DFT) calculations predict that the introduction of electron‐withdrawing groups hinders the afterglow emission, which may be related to the reducing reduction potential and inefficient spin‐orbit coupling (SOC) coefficients. The afterglow emission of the radical‐based systems demonstrates a bright opportunity for information encryption, anti‐counterfeiting, and photolithography.

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Synthesis process dependent white LPL in Zn2GeO4 ceramic and the long afterglow mechanism

Cited by 7 publications

References 37 publications

Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

Interstitial Zinc Boosted Light Tunability, Afterglow, and Ultrabright White Emission in Zinc Germanate (Zn₂GeO₄)

Radical Afterglow Emission Harnessed by Doping N,N’‐Diaryl‐5,10‐Dihydrophenazines to Epoxy Resins

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Synthesis process dependent white LPL in Zn2GeO4 ceramic and the long afterglow mechanism

Cited by 7 publications

References 37 publications

Controllable Synthesis and Luminescence Properties of Zn2GeO4 : Mn2+ Nanorod Phosphors

Controllable Synthesis and Luminescence Properties of Zn2GeO4 : Mn2+ Nanorod Phosphors

Interstitial Zinc Boosted Light Tunability, Afterglow, and Ultrabright White Emission in Zinc Germanate (Zn2GeO4)

Radical Afterglow Emission Harnessed by Doping N,N’‐Diaryl‐5,10‐Dihydrophenazines to Epoxy Resins

Contact Info

Product

Resources

About

Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

Controllable Synthesis and Luminescence Properties of Zn₂GeO₄ : Mn²⁺ Nanorod Phosphors

Interstitial Zinc Boosted Light Tunability, Afterglow, and Ultrabright White Emission in Zinc Germanate (Zn₂GeO₄)