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

作者：Ohnishi Akimasa^*; Saito Miki; Kitaura Mamoru; Itoh Minoru; Sasaki Minoru

来源：Journal of Luminescence, 2012, 132(10): 2639-2642.

DOI：10.1016/j.jlumin.2012.05.009

• Auger-free luminescence
• Cross-luminescence
• Core-valence luminescence
• Interatomic p-d transition
• Self-trapped exciton luminescence
• Rb2ZnCl4

It is reported that Auger-free (AF) luminescence appears with two bands at 4.5 and 6.3 eV 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 similar to 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 1.9 eV. This band has an excitation threshold at the fundamental absorption edge, and is ascribed to the radiative decay of a self-trapped exciton.

• 出版日期2012-10