Photoluminescence of oxygen vacancies in nanostructured Al2O3

Kostyukov, Anton I.; Zhuzhgov, Aleksey V.; Каичев, В. В.; Rastorguev, A. A.; Снытников, В. Н.

doi:10.1016/j.optmat.2017.11.040

Cited by 40 publications

(9 citation statements)

References 44 publications

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“…There are many excess cations and various defects in the doping region . When the Al 2 O 3 matrix is doped, the excess cations and anion vacancies produced are equivalent to a positron center, attracting the surrounding electrons to form an F color center . The oxygen-vacancy F color center binds an electron to form the F + color center, and a defect energy is formed within the band gap.…”

Section: Resultsmentioning

confidence: 99%

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

Duan

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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A liquid metal (LM) generally has excellent electrical conductivity, thermal conductivity, flexibility, fluidity, and reflectivity. Innovative electronics using a LM to paint colorful fluorescent patterns may be applied to many important fields. Herein we propose, for the first time, the use of a LM to paint fluorescent patterns in the field of natural science. An LM containing a main-group metal (Ga50.25Bi8.28In28.2Sn13.27) is used to paint a uniform alloy film on a ceramic substrate. The painting is not restricted by any curved surface, shape, or size, which therefore gives the LM diverse adaptability. We have adopted the strategy of “painting–annealing–dealloying” through which LM can easily be diffused and doped into the substrate to produce various defects. Defects, my themselves or through their interactions, can produce different colors of emitted light. The primary fluorescence colors, such as purple, yellow, blue, and white, have been painted with the LM. Importantly, the brightness and color coordinates can be adjusted by changing the LM composition or annealing temperature, and intricate, delicate, colorful fluorescence patterns can be produced. Due to the unique painting form, colorful fluorescence, high stability, corrosion resistance, and low cost of the technique used for the LM, it can be used for displays, lighting panels, flexible electronic circuits, anticounterfeiting devices, and sensors.

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Section: Resultsmentioning

confidence: 99%

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

Duan

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…Установлено [8,9], что независимо от методов синтеза α-Al 2 O 3 в нем всегда имеется недостаток кислорода, что подтверждается наличием линий люминесценции, связанных с вакансиями кислорода, даже в исходном образце (кривая 1). Похожий спектр ФЛ также наблюдался в работе [10]…”

Section: образцы и методика экспериментаunclassified

“…Природа возникновения наблюдаемой в спектрах всех образцов полосы ФЛ при 590 nm не совсем ясна. Следует отметить, что эта полоса также наблюдалась в спектрах монокристаллического α-Al 2 O 3 и другими авторами, например в работе [10]. Возможно, появление пика на этих длинах волн связано с поглощением излучения примесными ионами Cr 3+ .…”

Section: спектры фл при возбуждении на длине волныunclassified

Фотолюминисценция Сапфира, Облученного Электронами И Ионами Низких Энергий

Зыкова¹,

Озерова²,

Татаринцев³

et al. 2022

Оптика И Спектроскопия

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Photoluminescence (PL) of sapphire single crystals as received and preirradiated by low energy Ar+ ions and electrons has been studied to reveal a relationship between sapphire charging under electron beam irradiation and radiation-induced defect formation. The photoluminescence spectra were obtained using a confocal microscope wavelength of 445 nm as well as by a nonconfocal method with excitation at a wavelength of 355 nm. The lines observed in PL spectra for all samples are associated with both intrinsic and impurity defects. It has been established that preliminary ion irradiation leads to disordering of the near-surface region of the sample resulting in a significant increase in the photoluminescence intensity. Preliminary electron irradiation can lead to a change in the charge state of defects that initially exist in the crystal.

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“…Similar to the strategy of the protective SEI films generated by the reactions between metallic lithium and electrolyte additives, an artificial SEI film with a designed microstructure can restrain the lithium dendrite growth and improve the cycling performance. Many kinds of materials have been tried to use as artificial protective films such as Al 2 O 3, − graphite, carbon nanotubes, carbon nanofibers, carbon nanospheres, inorganic compounds, or alloy layers of Li, − glass fibers, and polymerization. , Generally, the protective film strategies can change the direct contacts between metallic lithium and electrolyte and regulate the transport and distribution of ions. On the other hand, modifying the lithium anode itself by special structures , or alloying − can form a more stable and evenly arranged frame to keep the anode’s stability in long cycling.…”

Section: Introductionmentioning

confidence: 99%

From Dendrites to Hemispheres: Changing Lithium Deposition by Highly Ordered Charge Transfer Channels

Xue-Wen

Cui

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Metallic lithium as an anode is an ultimate ideal for rechargeable lithium batteries with high energy density such as lithium–oxygen batteries and lithium–sulfur batteries. However, the excess reactivity and asymmetrical dissolution–deposition of the metallic lithium anode make it impossible to support a stable long charge–discharge cycling. To protect the metallic lithium anode, apparently it needs to adjust the dissolution and deposition of lithium ions, but more essentially, it should reasonably change the distribution and transport of electrons on the surface and interface of the metallic lithium. In this work, anodic aluminum oxide (AAO) membranes are used to build highly ordered channels on the lithium anode surface in which lithium ions can transfer in the channels and electrons can be transported by the lithiation reaction of alumina with an oxygen vacancy-involved process. As a result, the cyclic reaction actually is partially transferred to the AAO surface, and lithium deposition occurs there as a hemispherical appearance but not as dendrites. Meanwhile, the highly ordered characteristics provide a physical effect to make the deposited lithium hemispheres a uniform distribution on the AAO surface. The AAO-regulated lithium anodes could be widely used to improve the cycling performance for metal lithium batteries.

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Photoluminescence of oxygen vacancies in nanostructured Al2O3

Cited by 40 publications

References 44 publications

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

Фотолюминисценция Сапфира, Облученного Электронами И Ионами Низких Энергий

From Dendrites to Hemispheres: Changing Lithium Deposition by Highly Ordered Charge Transfer Channels

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