Study of the 1s orthoexciton luminescence in Cu2O under two-photon excitation

A new method of ion-exchange between raw compounds containing copper oxide and alkali glasses has been used to grow copper nanoparticles within a glass matrix, forming a metal-glass nanocomposite that is the structure on which both ancient and modern lustre glazes are based. When excited by X-rays at 300 K, two dominant emission bands appear in the material in the visible region, peaking at 2.60 eV and 1.98 eV. Synchrotron radiation methods are deployed that enables the luminescence and structural properties of the nanocomposite to be interlinked. Standard Extended X-ray Absorption Fine Structure (EXAFS) shows that both metallic copper and copper oxide local sites structure are present in the glass matrix, and the detailed atomic arrangement of each are derived; however, the method provides no information as to whether either structures are actually involved in the luminescence processes. In order to provide this direct link, Optically Detected X-ray Absorption Spectroscopy (OD-XAS) has been deployed, and this provides strong evidence that copper metal nanoparticles are responsible for the red emission. The method also shows that the X-ray absorption processes of the metal particles and silicate lattice (that result in the red and blue emissions respectively) are distinctly different. This is the first report of OD-XAS involving metallic nanoparticles, and opens the possibility of using the method more generally for metal nanoparticle research.

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X‐ray absorption and luminescence properties of metallic copper nanoparticles embedded in a glass matrix

Roqué

Poolton

Molerà

et al. 2006

Physica Status Solidi (b)

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A Temperature Study of High‐n$n$ Rydberg States in Cu2O${\rm Cu}_2{\rm O}$

Heckötter,

Panda,

Brägelmann

et al. 2024

Adv Quantum Tech

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The temperature dependence of Rydberg excitons in with principal quantum numbers is investigated for bath temperatures between 1.3 and 50 K. The energy shift of Rydberg exciton lines allows us to perform a precise measurement of the band gap as a function of temperature. The phonon shows a dominant contribution to the temperature shift of the band gap. The optical properties of Rydberg excitons are analyzed for different temperatures and discussed in the context of phonon scattering as well as thermal ionization of impurities and compared to earlier descriptions in Ref. [1]. The maximum principal quantum number as a function of temperature in crystals of different quality is studied and compared. The observations are correlated to photoluminescence spectra of impurities at different temperatures.

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Cuprous oxide thin films prepared by thermal oxidation of copper layer. Morphological and optical properties

Karapetyan

Reymers

Giorgio

et al. 2015

Journal of Luminescence

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Study of the 1s orthoexciton luminescence in Cu2O under two-photon excitation

Cited by 3 publications

References 26 publications

X‐ray absorption and luminescence properties of metallic copper nanoparticles embedded in a glass matrix

X‐ray absorption and luminescence properties of metallic copper nanoparticles embedded in a glass matrix

A Temperature Study of High‐n$n$ Rydberg States in Cu2O${\rm Cu}_2{\rm O}$

Cuprous oxide thin films prepared by thermal oxidation of copper layer. Morphological and optical properties

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