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Erbium energy levels in GaN grown by hydride vapor phase epitaxy

Authors :
Jing Li
Yaqion Yan
T. B. Smith
Jingyu Lin
Hongxing Jiang
Source :
AIP Advances, Vol 10, Iss 12, Pp 125006-125006-8 (2020)
Publication Year :
2020
Publisher :
AIP Publishing LLC, 2020.

Abstract

Erbium doped GaN (Er:GaN) is a promising candidate as a novel gain medium for solid-state high energy lasers (HELs) due to its superior physical properties over a synthetic garnet such as Nd:YAG. Er:GaN emits in the 1.5 µm region, which is retina-safe and has a high transmission in the air. We report photoluminescence (PL) studies performed on Er:GaN epilayers synthesized by the hydride vapor phase epitaxy (HVPE) technique. The room temperature PL spectra of HVPE grown Er:GaN epilayers resolved as many as 11 and seven emission lines in the 1.5 µm and 1.0 µm wavelength regions, respectively, corresponding to the intra-4f shell transitions between Stark levels from the first (4I13/2) and the second (4I11/2) excited states to the ground state (4I15/2) of Er3+ in GaN. The observed peak positions of these transitions enabled the construction of the detailed energy levels in Er:GaN. The results agree well with those of the calculation based on a crystal field analysis. Precise determination of the detailed energy levels of the Stark levels in the 4I11/2, 4I13/2, and 4I15/5 states is critically important for the realization of HELs based on Er:GaN.

Details

Language :
English
ISSN :
21583226
Volume :
10
Issue :
12
Database :
OpenAIRE
Journal :
AIP Advances
Accession number :
edsair.doi.dedup.....148eb7ec5a76c8df2b025183208dfa3e