Single-phased emission-tunable Mg and Ce co-doped ZnO quantum dots for white LEDs

Shi, Qiang; Ling, Kai; Duan, Susu; Wang, Xue; Xu, Shiyi; Zhang, Dong; Wang, Qingru; Li, Shuhong; Zhao, Ling; Wang, Wenjun

doi:10.1016/j.saa.2020.118096

Cited by 15 publications

(6 citation statements)

References 36 publications

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“…In addition to the ICP-OES analysis, EPR is another important technique to identify and qualitatively monitor oxygen vacancies. , Figure b shows the EPR spectra of the LZG host and LZGM 0.01 sample. Compared with the host, the g ≈ 2.003 signal of the doped sample is stronger, indicating that the incorporation of Mn 2+ produces more oxygen vacancies. − As a supplement, the O 1s XPS spectra of LZG and LZGM 0.01 phosphors (Figure S2c,d) were studied, and the deconvoluted peak at 531.38 eV is ascribed to V O defects. , Moreover, the high-resolution XPS spectrum of Mn 2p is presented in Figure c, and it can be fitted into two separate peaks of 641.62 and 655.27 eV, corresponding to the Mn 2+ 2p levels of p 3/2 and p 1/2 , respectively . To further verify the valence state of the doped ions, the EPR spectrum focusing on the Mn measurement was collected, as shown in Figure d.…”

Section: Resultsmentioning

confidence: 99%

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Zhang

Zheng

et al. 2021

Inorg. Chem.

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Mechanoluminescent materials have shown great application potential in the fields of stress detection, anticounterfeiting, and optical storage; however, its development is hindered by the unclear mechanism. Different from the mainstream exploration of new mechanoluminescent materials in noncentrosymmetric structures, a centrosymmetric mechanoluminescent material Li 2 ZnGeO 4 :Mn 2+ is synthesized by a standard hightemperature solid-state reaction in an ambient atmosphere. Combined with the Rietveld refinement, photoluminescence, electron spin resonance, and X-ray photoelectron spectroscopy, it is proved that the increase in oxygen vacancies is accompanied by the self-reduction process from Mn 4+ to Mn 2+ , and the mechanism of mechanoluminescence is clarified through the afterglow and thermoluminescence spectra. The carriers trapped by the shallow traps participate in the mechanoluminescence process through the tunneling effect, while the carriers trapped by the deep traps take part in the mechanoluminescence process via conduction band or tunneling. A signature anti-counterfeiting application is designed using the new mechanoluminescent material Li 2 ZnGeO 4 :0.004Mn 2+ . Utilizing the afterglow characteristics of Li 2 ZnGeO 4 :xMn 2+ phosphors, we designed an intelligent longpersistent luminescence quick response code (QR-code) and visualized information encoding/decoding model, which provides a fast, simple, and effective method for information encryption, transformation, and dynamic anti-counterfeiting. This study not only analyzes the self-reduction and mechanoluminescence processes in detail but also breaks the limitation of crystal symmetry and provides a new strategy for the exploration of novel mechanoluminescent materials.

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Section: Resultsmentioning

confidence: 99%

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Zhang

Zheng

et al. 2021

Inorg. Chem.

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“…Mg-Doped ZnO QDs. Co-Doping in the ZnO QDs was rst introduced by Shi et al 115 They fabricated Mg and Ce co-doped ZnO QDs via a simple facile low temperature route. The crystallite size was found to be decreasing with increasing Ce concentration.…”

Section: Transition Metal-doped Zno Qdsmentioning

confidence: 99%

“…115 Adapted with permission from ref. 115 superoxide radicals O 2 c À , singlet oxygen 1 O 2 , hydroperoxyl radicals HO 2 c, hydroxyl radicals cOH, and hydrogen peroxide H 2 O 2 , which are generated at the metal oxide surface upon UV irradiation in aqueous solutions. The rate of charge generation in the ZnO QDs is much faster than that in other indirect semiconductors.…”

Section: Photocatalysismentioning

confidence: 99%

“…Doping also results in an increase in the external quantum efficiency. Shi et al 115 fabricated Mg- and Ce-doped ZnO QDs LED for white light emission. The EL spectrum of the device is shown in Fig.…”

Section: Applicationmentioning

confidence: 99%

“…Copyright (2020) American Chemical Society. (j) EL spectra of Ce-and Mg-doped ZnO QLEDs 115. Adapted with permission from ref 115…”

mentioning

confidence: 99%

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Journey of ZnO quantum dots from undoped to rare-earth and transition metal-doped and their applications

Singh

2021

RSC Adv.

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ZnO-Based Phosphors Materials

Mofokeng¹,

Mokoena²,

Noto³

et al. 2023

Progress in Optical Science and Photonics

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Single-phased emission-tunable Mg and Ce co-doped ZnO quantum dots for white LEDs

Cited by 15 publications

References 36 publications

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Journey of ZnO quantum dots from undoped to rare-earth and transition metal-doped and their applications

ZnO-Based Phosphors Materials

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Single-phased emission-tunable Mg and Ce co-doped ZnO quantum dots for white LEDs

Cited by 15 publications

References 36 publications

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li2ZnGeO4:Mn2+

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li2ZnGeO4:Mn2+

Journey of ZnO quantum dots from undoped to rare-earth and transition metal-doped and their applications

ZnO-Based Phosphors Materials

Contact Info

Product

Resources

About

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺

Self-Reduction-Related Defects, Long Afterglow, and Mechanoluminescence in Centrosymmetric Li₂ZnGeO₄:Mn²⁺