Radiative decay of vacuum-ultraviolet excitation of silica synthesized by molecular precursors ofSi‐Sisites: An indicator of intracenter relaxation of neutral oxygen vacancies

(Gd,La)2-x O2CO3:Eux3+(0.01 ≤x≤0.04) were synthesized via a flux method at 400°C, and their photoluminescence properties under vacuum ultraviolet (VUV) excitation were examined. The excitation spectra showed two bands in the region from 125 nm to 300 nm, the first band centered at 190 nm was ascribed to absorption of related CO32- complex, and the second broad band centered at 246nm and 278nm in Gd2O2CO3:Eu3+ was ascribed to the charge transfer band of O2-→ Eu3+. Series samples exhibited red emission at around 611 nm under vacuum ultraviolet excitation corresponding to the 5D0→ 7F2.transition of Eu3+.

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Vacuum ultraviolet excitation of the 1.9-eV emission band related to nonbridging oxygen hole centers in silica

Physical Review B ◽

10.1103/physrevb.69.153201 ◽

2004 ◽

Vol 69 (15) ◽

Cited By ~ 41

Author(s):

M. Cannas ◽

F. M. Gelardi

Keyword(s):

Emission Band ◽

Vacuum Ultraviolet ◽

Nonbridging Oxygen ◽

Ultraviolet Excitation ◽

Oxygen Hole ◽

Hole Centers

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Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions

Applied Physics Letters ◽

10.1063/1.2216911 ◽

2006 ◽

Vol 88 (26) ◽

pp. 263119 ◽

Cited By ~ 35

Author(s):

Y. Chao ◽

A. Houlton ◽

B. R. Horrocks ◽

M. R. C. Hunt ◽

N. R. J. Poolton ◽

...

Keyword(s):

Temperature Dependence ◽

Vacuum Ultraviolet ◽

Ultraviolet Excitation ◽

Si Nanocrystals ◽

Optical Luminescence

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LUMINESCENCE MECHANISM STUDY OF A POTENTIAL SCINTILLATION CRYSTAL YBa3B9O18

International Journal of Modern Physics B ◽

10.1142/s0217979211058857 ◽

2011 ◽

Vol 25 (12) ◽

pp. 1637-1644

Author(s):

MING HE ◽

Z. H. ZHANG ◽

X. L. CHEN ◽

M. H. QIU ◽

Y. K. JI ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Radiative Decay ◽

Vacuum Ultraviolet ◽

Band Gap Energy ◽

Luminescence Spectra ◽

Mechanism Study ◽

Scintillation Crystal ◽

Valence Region ◽

Structure Correlation ◽

Excited Luminescence

The luminescence mechanisms of a potential scintillation crystal YBa 3 B 9 O 18 were investigated by experimental methods. As a first step, the optical band gap energy Eg was estimated to be 7.3 eV from the optical absorption spectrum and vacuum ultraviolet excited luminescence spectra. The X-ray photoelectron spectroscopy measured in the valence region coincided with the first principle energy band calculation. Based on the analysis of valence band structure and vacuum ultraviolet excited luminescence spectra the origins of emission bands of YBa 3 B 9 O 18 were studied. The intrinsic luminescence of YBa 3 B 9 O 18 was attributed to the radiative decay of self-trapped excitons. The elucidation of the luminescence mechanism provides a physical picture on the property-structure correlation and may help to accelerate the applications of the potential scintillation crystal.

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