Alteration of Mn exchange coupling by oxygen interstitials in ZnO:Mn thin films

Ilyas, Usman; Rawat, Rajdeep Singh; Wang, Ying; Tan, T.L.; Lee, Paul; Chen, R.; Sun, Handong; Li, Fengji; Zhang, Sam

doi:10.1016/j.apsusc.2012.03.043

Cited by 53 publications

(29 citation statements)

References 29 publications

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“…It should be noted that quenching the visible emission as well as its red-shift as a result of Mn doping were earlier observed in ZnO ceramics, films and nanostructures [1][2][3][4][5][6] and were often ascribed to redistribution of green and orange PL bands intensities due to suppression of self-activated green emission [2][3][4][5][6]. This suppression was accounted for by the decrease of concentrations of zinc interstitials Zn i and/or oxygen vacancies V O as a result of Mn incorporation [2][3][4][5]13].…”

Section: Resultsmentioning

confidence: 99%

“…This suppression was accounted for by the decrease of concentrations of zinc interstitials Zn i and/or oxygen vacancies V O as a result of Mn incorporation [2][3][4][5]13]. However, it is known that, in addition to self-activated green band peaked at about 2.40 eV (510-520 nm) [14][15][16], another one peaked at about 2.30 eV (530-540 nm) and related to residual Cu impurity is usually present in PL spectrum of intentionally undoped ZnO [14][15][16].…”

Section: Resultsmentioning

confidence: 99%

“…This effect was accounted for by different sites of Mn ions in the host lattice [8] as well as their interaction with Zn i [2,5,13] and V O [1][2][3][4][5]. The possibility of Mn cluster formation also should be taken into account [6,27].…”

Section: Resultsmentioning

confidence: 99%

“…The latter can be accounted for by the fact that ZnO:Mn, contrary to some other II-VI compounds (ZnS:Mn, ZnSe:Mn, CdS:Mn), exhibits quite weak emission. It has been shown that doping ZnO with Mn results in suppression of self-activated luminescence [1][2][3][4][5][6]. This effect, however, was not investigated in detail, and its mechanism was not decisively established.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the presence of Mn-related band in ZnO:Mn emission spectrum is still a matter of debate. Some authors believe that a new emission band arises due to Mn doping [7][8][9][10], while the others assert that only redistribution of the intensities of initially present emission bands occurs [2][3][4][5]. Thus, to understand the mechanisms of the processes that result in modification of ZnO emission by the Mn doping further study is required.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Mn doping on ZnO defect-related emission

Stara¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Defect related emission in undoped and doped with manganese ZnO ceramics was investigated. Mn concentration N Mn was varied from 10 19 to 10 21 cm -3.The samples were sintered for 3 hours in air at 1100 °C. The color of ZnO:Mn ceramics changed from yellow to reddish-brown with increasing the Mn content. Photoluminescence (PL) spectra of prepared samples were measured at room temperature and analyzed by Gaussian fitting. PL of undoped ceramics exhibited itself as intense broad band peaking at about 550 nm. Two effects were shown to occur as a result of Mn doping: i) drastic quenching of self-activated PL accompanied by gradual red-shift of spectral boundary of the quenching with increasing the Mn content; ii) appearance of a new emission band peaking at 645 nm that becomes dominant in the PL spectrum at N Mn = 10 20 cm -3 . The observed effects were believed to be due to re-absorption of self-activated ZnO emission by Mn-related centers. The following recombination in excited centers was supposed to occur by both radiative and nonradiative ways, the former being responsible for 645 nm PL band.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Mn doping on ZnO defect-related emission

Stara¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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Tunable and White‐Light Emission from Single‐Phase Ca₂YF₄PO₄:Eu²⁺,Mn²⁺ Phosphors for Application in W‐LEDs

et al. 2013

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Novel phosphors, Ca2YF4PO4:Eu2+,Mn2+, have been prepared by high‐temperature solid‐state reactions. XRD and XPS techniques were used to investigate the purity and composition of the as‐prepared samples. The Ca2YF4PO4:Eu2+,Mn2+ phosphors exhibit broad excitation spectra ranging from 275–420 nm and the emission spectra show a broad blue emission band centered at 455 nm and a yellow emission band centered at 570 nm, which originate from the Eu2+ and Mn2+ ions, respectively. Energy transfer from the Eu2+ to Mn2+ ions in the Ca2YF4PO4 host matrix was observed and studied by luminescence spectrosccopy as well as the lifetime of the Eu2+ ions. The emission color of the Ca2YF4PO4:Eu2+,Mn2+ samples can be adjusted from blue to yellow under excitation by UV radiation of 375 nm by adjusting the Eu2+ and Mn2+ concentrations, and white‐light emission with chromaticity coordinates (0.327, 0.312) was obtained with the Ca2YF4PO4:0.015Eu2+,0.015Mn2+ sample. In addition, the temperature‐dependent photoluminescence of the as‐prepared phosphors has been investigated in detail. The results revealed that the Ca2YF4PO4 host has good thermal stability. The stable structure of the host and tunable luminescence suggest that Ca2YF4PO4:Eu2+,Mn2+ could be regarded as a good candidate for UV LED‐based white‐light emitting diodes.

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Aqueous MnV₂O₆‐Zn Battery with High Operating Voltage and Energy Density

Zhu

et al. 2021

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Aqueous Zn ion batteries (AZIBs), featuring low cost, long‐term cycling stability, and superior safety are promising for applications in advanced energy storage devices. However, they still suffer from unsatisfactory energy density and operating voltage, which are closely related to cathode materials used. Herein, the use of monoclinic MnV2O6 (MVO) is reported, which can be activated for high‐capacity Zn ions storage by electrochemically oxidizing part of the Mn2+ to Mn3+ or Mn4+ while the remaining Mn2+ ions act as binders/pillars to hold the layer structure of MVO and maintain its integrity during charging/discharging process. Moreover, after introducing carbon nanotubes (CNT), the MVO:CNT composite not only provides robust 3D Zn‐ion diffusion channels but also shows enhanced structural integrity. As a result, a MVO:CNT cathode delivers a high midpoint voltage (1.38 V after 3000 cycles at 2 A g−1) and a high energy density of 597.9 W h kg−1. Moreover, DFT analyses clearly illustrate stepwise Zn ion insertion into the MnV2O6 lattice, and ex‐situ analyses results further verify the highly structural reversibility of the MnV2O6 cathode upon extended cycling, demonstrating the good potential of MnV2O6 for the establishment of viable aqueous Zn ion battery systems.

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Alteration of Mn exchange coupling by oxygen interstitials in ZnO:Mn thin films

Cited by 53 publications

References 29 publications

Influence of Mn doping on ZnO defect-related emission

Influence of Mn doping on ZnO defect-related emission

Tunable and White‐Light Emission from Single‐Phase Ca₂YF₄PO₄:Eu²⁺,Mn²⁺ Phosphors for Application in W‐LEDs

Aqueous MnV₂O₆‐Zn Battery with High Operating Voltage and Energy Density

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Alteration of Mn exchange coupling by oxygen interstitials in ZnO:Mn thin films

Cited by 53 publications

References 29 publications

Influence of Mn doping on ZnO defect-related emission

Influence of Mn doping on ZnO defect-related emission

Tunable and White‐Light Emission from Single‐Phase Ca2YF4PO4:Eu2+,Mn2+ Phosphors for Application in W‐LEDs

Aqueous MnV2O6‐Zn Battery with High Operating Voltage and Energy Density

Contact Info

Product

Resources

About

Tunable and White‐Light Emission from Single‐Phase Ca₂YF₄PO₄:Eu²⁺,Mn²⁺ Phosphors for Application in W‐LEDs

Aqueous MnV₂O₆‐Zn Battery with High Operating Voltage and Energy Density