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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 9 — Sep. 1, 2012
  • pp: 1186–1202

Analysis of the spectra of trivalent erbium in multiple sites of hexagonal aluminum nitride

John B. Gruber, Ulrich Vetter, Gary W. Burdick, Zackery D. Fleischman, Larry D. Merkle, Takashi Taniguchi, Yuan Xiaoli, Takashi Sekiguchi, Daniel Jürgens, and Hans Hofsäss  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 9, pp. 1186-1202 (2012)
http://dx.doi.org/10.1364/OME.2.001186


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Abstract

The 12 K cathodoluminescence spectra of Er3+ doped into single crystals of aluminum nitride (2H-AlN) in the hexagonal phase are reported between 320 nm and 775 nm. The emission spectra represent transitions from the lower Stark level of 2P3/2 to the Stark levels of the 4I15/2, 4I13/2, 4I11/2, 4I9/2, 4F9/2, and 4S3/2 multiplet manifolds of Er3+(4f11). Emission spectra from 4S3/2 to 4I15/2 are also reported. All observed strong line emission are accounted for in terms of two principle sites, denoted site “a” and site “b”, with a few line spectra attributed to additional sites. A parameterized Hamiltonian that includes the atomic and crystal-field terms for Er3+(4f11)2S+1LJ was used to determine the symmetry and the crystal field splitting of the “a” and “b” sites. A descent in symmetry calculation was carried out to determine if distortion due to the size difference between Er, Al and the vacancies can be discerned. Modeling results assuming C3v and C1h are discussed. It appears that the sensitivity to a C1h model is not sufficient to invalidate the choice of C3v as an approximate symmetry for both sites. The g-factors reported from an EPR study of Er3+ in single-crystal AlN are in reasonable agreement with calculated g-factors for Er3+ in the “a” site assuming C3v symmetry.

© 2012 OSA

OCIS Codes
(020.6580) Atomic and molecular physics : Stark effect
(160.2540) Materials : Fluorescent and luminescent materials

ToC Category:
Fluorescent and Luminescent Materials

History
Original Manuscript: June 26, 2012
Revised Manuscript: July 25, 2012
Manuscript Accepted: July 27, 2012
Published: August 1, 2012

Citation
John B. Gruber, Ulrich Vetter, Gary W. Burdick, Zackery D. Fleischman, Larry D. Merkle, Takashi Taniguchi, Yuan Xiaoli, Takashi Sekiguchi, Daniel Jürgens, and Hans Hofsäss, "Analysis of the spectra of trivalent erbium in multiple sites of hexagonal aluminum nitride," Opt. Mater. Express 2, 1186-1202 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-9-1186


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