Luminescence of Eu ions in AlxGa1-xN across the entire alloy composition range

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Wang, K. and O'Donnell, K.P. and Hourahine, B. and Martin, R.W. and Watson, I.M. and Lorenz, K. and Alves, E. (2009) Luminescence of Eu ions in AlxGa1-xN across the entire alloy composition range. Physical Review B, 80 (12). 125206. ISSN 1098-0121 (https://doi.org/10.1103/PhysRevB.80.125206)

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Abstract

Photoluminescence (PL) and PL excitation (PLE) spectra of Eu-implanted AlxGa1-xN are obtained across the whole alloy composition range. The dominant D-5(0)-F-7(2) emission band broadens and then narrows as x increases from 0 to 1 while the peak shifts monotonically. This behavior is surprisingly similar to the broadening of excitons in a semiconductor alloy caused by composition fluctuations [E. F. Schubert et al., Phys. Rev. B 30, 813 (1984). PLE spectra reveal a steplike AlxGa1-xN band-edge absorption and two "subgap" bands X-1,X-2:X-1 peaks at 3.26 eV in GaN and shifts linearly to 3.54 eV in AlN. For x > 0.6, X-2 emerges approximately 1 eV higher in energy than X-1 and shifts in a similar way. We propose that X-1,X-2 involve creation of core-excitonic complexes of Eu emitting centers.

ORCID iDs

Wang, K., O'Donnell, K.P. ORCID logoORCID: https://orcid.org/0000-0003-3072-3675, Hourahine, B. ORCID logoORCID: https://orcid.org/0000-0002-7667-7101, Martin, R.W. ORCID logoORCID: https://orcid.org/0000-0002-6119-764X, Watson, I.M. ORCID logoORCID: https://orcid.org/0000-0002-8797-3993, Lorenz, K. and Alves, E.;
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