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2.5 eV Pulsed Cathodoluminesce band of silicon dioxide | | V.A. Kozlov
; S.A. Kutovoi
; N.V. Pestovskii
; A.A. Petrov
; A.A. Rodionov
; S.Yu. Savinov
; Yu.D. Zavartsev
; M.V. Zavertyaev
; A.I. Zagumennyi
; | | Date: |
9 Aug 2017 | | Abstract: | Room-temperature (RT) Pulsed Cathodoluminescence (PCL) spectra of a set of
pure synthetic (both crystalline and amorphous) silicon dioxide materials were
studied. It is shown, that the PCL spectra of all samples (both amorphous and
crystalline) possess a separate band at 495 nm (2.5 eV). This band is the most
intensive one in PCL spectra of disordered materials. The RT PCL band at 495 nm
(2.5 eV) of {alpha}-quartz single crystal is polarized in XY crystalline plane
(perpendicular to the $3^{rd}$ order symmetry axis). The structure of this band
was detected. It consists of three peaks: at 480$pm$2 nm (2.58$pm$0.01 eV),
487$pm$ nm (2.55$pm$0.01 eV) and 493$pm$2 nm (2.52$pm$0.01 eV). Energy
separation between peaks is equal in order of magnitude to energies of
$Li_{x}O_{y}$ molecular vibrations and to the energy of optical phonon in
{alpha}-quartz. It is shown, that the emission band at 495 nm (2.5 eV) in RT
PCL spectra of {alpha}-quartz single crystal is related to the bulk emission
centers, not to the surface-related ones. The annealing behaviors of the 495 nm
(2.5 eV) bands in spectrum of amorphous and crystalline $SiO_{2}$ are close to
each other. This fact may be the manifestation of identical origin of these
bands. The following explanation of experimental data is proposed: the origin
of 495 nm (2.5 eV) band in pure silicon dioxide is related to the recombination
of non-bridging oxygen $NBO^{-}-Li^{+}$ centers. | | Source: | arXiv, 1708.3321 | | Services: | Forum | Review | PDF | Favorites | |
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