Resonant excitation of infra-red emission in GaN:(Mn,Mg)

TL;DR

This study combines experimental spectroscopy and theoretical calculations to identify the main excitation pathways and specific configurations responsible for IR emission in GaN doped with Mn and Mg, revealing detailed electronic transition mechanisms.

Contribution

It introduces a combined experimental and theoretical approach to pinpoint the excitation channels and configurations responsible for IR emission in GaN:(Mn,Mg).

Findings

Identification of efficient excitation channels for IR emission.

Reconstruction of Tanabe-Sugano energy diagram for Mn$^{5+}$.

Single out Mn-Mg$_{3}$ as key configurations for IR emission.

Abstract

By combining experimental photoluminescence excitation spectroscopy and calculations based on density functional theory and many-body Green's functions, the most efficient excitation channels of infra-red (IR) emission from Mn-Mg$_{k}$ paramagnetic complexes stabilized in GaN:(Mn,Mg) are here identified. Moreover, a Tanabe-Sugano energy diagram for 3$d^{2}$Mn$ ^{5+}$ is reconstructed and Mn-Mg$_{3}$ are singled out as the predominant configurations responsible for the IR emission. The correlation of intensity of the individual emission lines as a function of temperature and excitation energy, allows assigning them to well defined and specific optical transitions.