Auger-free luminescence due to interatomic p–d transition and self-trapped exciton luminescence in Rb2ZnCl4 crystals

It is reported that Auger-free (AF) luminescence appears with two bands at 4.5 and 6.3eV in Rb2ZnCl4. This luminescence originates from a radiative transition of the Cl 3p valence electrons into the Zn 3d outermost-core holes. The present work is the first observation of AF luminescence due to inter...

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Bibliographic Details
Published in:Journal of luminescence 2012-10, Vol.132 (10), p.2639-2642
Main Authors: Ohnishi, Akimasa, Saito, Miki, Kitaura, Mamoru, Itoh, Minoru, Sasaki, Minoru
Format: Article
Language:English
Subjects:
Auger-free luminescence
Augers
Bands
Clean metal, semiconductor, and insulator surfaces
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Core–valence luminescence
Cross-luminescence
Crystals
Decay
Electron and ion emission by liquids and solids
impact phenomena
Electron states
Exact sciences and technology
Excitation
Excitons and related phenomena
Halides
Interatomic p–d transition
Luminescence
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other solid inorganic materials
Photoemission and photoelectron spectra
Photoluminescence
Physics
Rb2ZnCl4
Self-trapped exciton luminescence
Thresholds
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Summary:It is reported that Auger-free (AF) luminescence appears with two bands at 4.5 and 6.3eV in Rb2ZnCl4. This luminescence originates from a radiative transition of the Cl 3p valence electrons into the Zn 3d outermost-core holes. The present work is the first observation of AF luminescence due to interatomic p–d transitions in halide crystals. The appearance of two AF luminescence bands suggests the existence of two types of AF transitions following core hole creation. A largely Stokes-shifted luminescence band is also found to appear at 1.9eV. This band has an excitation threshold at the fundamental absorption edge, and is ascribed to the radiative decay of a self-trapped exciton. ► Studied Auger-Free (AF) and self-trapped exciton (STE) luminescence in Rb2ZnCl4. ► Found AF luminescence due to interatomic p–d transitions in halide crystals for the first time. ► Clarified the STE luminescence in this crystal for the first time.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2012.05.009