The role of donor-acceptor pairs in the excitation of Eu-ions in GaN:Eu epitaxial layers

B. Mitchell; J. Poplawsky; D. Lee; A. Koizumi; Y. Fujiwara; V. Dierolf

doi:10.1063/1.4879253

The role of donor-acceptor pairs in the excitation of Eu-ions in GaN:Eu epitaxial layers

B. Mitchell, J. Poplawsky, D. Lee, A. Koizumi, Y. Fujiwara, V. Dierolf

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49 Scopus citations

Abstract

The nature of Eu incorporation and resulting luminescence efficiency in GaN has been extensively investigated. By performing a comparative study on GaN:Eu samples grown under a variety of controlled conditions, and using a variety of experimental techniques, the configuration of the majority site has been concluded to contain a nitrogen vacancy (V_N). The nitrogen vacancy can appear in two symmetries, which has a profound impact on the luminescence and magnetic properties of the sample. The structure of the minority site has also been identified. We propose that, for both sites, the excitation efficiency of the red Eu emission is improved by the presence of donor-acceptor pairs in the close vicinity of the Eu.

Original language	English
Article number	204501
Journal	Journal of Applied Physics
Volume	115
Issue number	20
DOIs	https://doi.org/10.1063/1.4879253
State	Published - May 28 2014
Externally published	Yes

Funding

Funders	Funder number
Japan Society for the Promotion of Science	9GS1209
National Science Foundation	ECCS-1140038
Japan Society for the Promotion of Science	26820113, 24226009

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AU - Mitchell, B.

AU - Poplawsky, J.

AU - Lee, D.

AU - Koizumi, A.

AU - Fujiwara, Y.

AU - Dierolf, V.

PY - 2014/5/28

Y1 - 2014/5/28

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AB - The nature of Eu incorporation and resulting luminescence efficiency in GaN has been extensively investigated. By performing a comparative study on GaN:Eu samples grown under a variety of controlled conditions, and using a variety of experimental techniques, the configuration of the majority site has been concluded to contain a nitrogen vacancy (VN). The nitrogen vacancy can appear in two symmetries, which has a profound impact on the luminescence and magnetic properties of the sample. The structure of the minority site has also been identified. We propose that, for both sites, the excitation efficiency of the red Eu emission is improved by the presence of donor-acceptor pairs in the close vicinity of the Eu.

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The role of donor-acceptor pairs in the excitation of Eu-ions in GaN:Eu epitaxial layers

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