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Selectively excited photoluminescence from Eu- implanted GaN

Wang, K. and Martin, R.W. and O'Donnell, K.P. and Katchkanov, V. and Nogales, E. and Lorenz, K. and Alves, E. and Ruffenach, S. and Briot, O. (2005) Selectively excited photoluminescence from Eu- implanted GaN. Applied Physics Letters, 87 (11). ISSN 0003-6951

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The intensity of Eu-related luminescence from ion-implanted GaN with a 10 nm thick AlN cap, both grown epitaxially by metal organic chemical vapor deposition (MOCVD) is increased markedly by high-temperature annealing at 1300 °C. Photoluminescence (PL) and PL excitation (PLE) studies reveal a variety of Eu centers with different excitation mechanisms. High-resolution PL spectra at low temperature clearly show that emission lines ascribed to 5D0-7F2 (~622 nm), 5D0-7F3 (~664 nm), and 5D0-7F1 (~602 nm) transitions each consist of several peaks. PL excitation spectra of the spectrally resolved components of the 5D0-7F2 multiplet contain contributions from above-bandedge absorption by the GaN host, a GaN exciton absorption at 356 nm, and a broad subedge absorption band centred at ~385 nm. Marked differences in the shape of the 5D0-7F2 PL multiplet are demonstrated by selective excitation via the continuum/exciton states and the below gap absorption band. The four strongest lines of the multiplet are shown to consist of two pairs due to different Eu3+ centers with different excitation mechanisms.