In-situ luminescence monitoring of ion-induced damage evolution in SiO2 and Al2O3

Crespillo, Miguel L.; Graham, Joseph; Zhang, Yongfeng; Weber, William J.

doi:10.1016/j.jlumin.2015.12.016

Cited by 65 publications

(39 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-purity, epi-polished, stoichiometric SrTiO 3 (001) single crystals, provided by MTI Corporation Ltd., were irradiated in the Ion Beam Materials Laboratory (IBML UT-ORNL) at the University of Tennessee, Knoxville [31]. The irradiation setup along with the temperature control and the spectroscopic characterization have been described previously [21][22][23]32,33]. The relevant irradiation parameters, including electronic excitation densities and total number of oxygen vacancies generated per incident ion [34], are summarized in Table 1 (also Supplemental Material).…”

Section: Methodsmentioning

confidence: 99%

The blue emission at 2.8 eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states

Crespillo

Graham

Agulló‐López

et al. 2019

Materials Research Letters

Self Cite

View full text Add to dashboard Cite

The origin of the blue emission in SrTiO 3 has been investigated as a function of irradiation fluence, electronic excitation density, and temperature using a range of ion energies and masses. The emission clearly does not show correlation with the concentration of vacancies generated by irradiation but is greatly enhanced under heavy-ion irradiation. The intensity ratio of the 2.8 and 2.5 eV bands is independent of fluence at all temperatures, but it increases with excitation rate. The 2.8 eV emission is proposed to correspond to a transition from conduction band states to the ground state level of the self-trapped exciton center. IMPACT STATEMENT A novel mechanism attributes the origin of the intriguing blue band in SrTiO 3 to a non-localized transition of the self-trapped exciton center from conduction band states to the ground level.

show abstract

Section: Methodsmentioning

confidence: 99%

The blue emission at 2.8 eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states

Crespillo

Graham

Agulló‐López

et al. 2019

Materials Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…The proper choice of ions with different masses and energies allows controlling the relative strength of electronic excitation and atomic collision processes, as well as the penetration depth of the excitation and structural damage [46][47][48]. As an example, a diagram of the installation available in the Ion Beam Materials Laboratory (IBML) at the University of Tennessee, Knoxville, TN, USA [45,49,50] is shown in Figure 2. amorphous samples suggesting that it is closely related to structural disorder [31,42,43].…”

Section: Luminescence Experimentsmentioning

confidence: 99%

“…Schematic of the experimental setup for in-situ ionoluminescence (IL) measurements reprinted from Crespillo et al[50], Copyright (2016), with permission from Elsevier.…”

mentioning

confidence: 99%

Recent Advances on Carrier and Exciton Self-Trapping in Strontium Titanate: Understanding the Luminescence Emissions

et al. 2019

View full text Add to dashboard Cite

An up-to-date review on recent results for self-trapping of free electrons and holes, as well as excitons, in strontium titanate (STO), which gives rise to small polarons and self-trapped excitons (STEs) is presented. Special attention is paid to the role of carrier and exciton self-trapping on the luminescence emissions under a variety of excitation sources with special emphasis on experiments with laser pulses and energetic ion-beams. In spite of the extensive research effort, a definitive identification of such localized states, as well as a suitable understanding of their operative light emission mechanisms, has remained lacking or controversial. However, promising advances have been recently achieved and are the objective of the present review. In particular, significant theoretical advances in the understanding of electron and hole self-trapping are discussed. Also, relevant experimental advances in the kinetics of light emission associated with electron-hole recombination have been obtained through time-resolved experiments using picosecond (ps) laser pulses. The luminescence emission mechanisms and the light decay processes from the self-trapped excitons are also reviewed. Recent results suggest that the blue emission at 2.8 eV, often associated with oxygen vacancies, is related to a transition from unbound conduction levels to the ground singlet state of the STE. The stabilization of small electron polarons by oxygen vacancies and its connection with luminescence emission are discussed in detail. Through ion-beam irradiation experiments, it has recently been established that the electrons associated with the vacancy constitute electron polaron states (Ti3+) trapped in the close vicinity of the empty oxygen sites. These experimental results have allowed for the optical identification of the oxygen vacancy center through a red luminescence emission centered at 2.0 eV. Ab-initio calculations have provided strong support for those experimental findings. Finally, the use of Cr-doped STO has offered a way to monitor the interplay between the chromium centers and oxygen vacancies as trapping sites for the electron and hole partners resulting from the electronic excitation.

show abstract

“…Most of the beam monitor consists of a fluorescent plate, enabling real time visualization of a beam spot on the plate. A SiO 2 plate, for example, has been used for beam monitoring because of strong emission [1][2][3][4][5] in the visible range when irradiated with MeV-ion beams. A Cr-doped Al 2 O 3 (e.g., AF995R, Desmarquest) is also suitable for beam profiling [6,7] for ion beams with energies larger than several hundred keV.…”

Section: Introductionmentioning

confidence: 99%

Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

Kobayashi

Nishiyama

Kondo

2021

QuBS

View full text Add to dashboard Cite

The color of a thin copper oxide layer formed on a copper plate was transformed from reddish-brown into dark blue-purple by irradiation with 5 keV Ar+ ions to a fluence as low as 1 × 1015 Ar+ cm−2. In the unirradiated copper oxide layer, the copper valence state of Cu2+ and Cu+ and/or Cu0 was included as indicated by the presence of a shake-up satellite line in a photoemission spectrum. While for the irradiated one, the satellite line decreased in intensity, indicating that irradiation resulted in the reduction from Cu2+ to Cu+ and/or Cu0. Furthermore, nuclear reaction analysis using a 16O(d, p)17O reaction with 0.85 MeV deuterons revealed a significant loss of oxygen (5 × 1015 O atoms cm−2) in the irradiated layer. Thus, the chromatic change observed in the present work originated in the irradiation-induced reduction of a copper oxide.

show abstract

In-situ luminescence monitoring of ion-induced damage evolution in SiO2 and Al2O3

Cited by 65 publications

References 71 publications

The blue emission at 2.8 eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states

The blue emission at 2.8 eV in strontium titanate: evidence for a radiative transition of self-trapped excitons from unbound states

Recent Advances on Carrier and Exciton Self-Trapping in Strontium Titanate: Understanding the Luminescence Emissions

Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

Contact Info

Product

Resources

About