%0 Journal Article %T Direct evidence of trap-mediated excitation in GaN:Er3+ with a two-color experiment %+ Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252) %A Bodiou, Loic %A Braud, Alain %< avec comité de lecture %@ 0003-6951 %J Applied Physics Letters %I American Institute of Physics %V 93 %P 151107 %8 2008 %D 2008 %Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles %X We report a direct confirmation of the generally proposed rare-earth excitation model in GaN. The intermediate step involving the formation of excitons bound to rare-earth ions prior to the rare-earth excitation is demonstrated. Using a two-color experiment, we show that the erbium photoluminescence decay following a pulsed laser excitation is quenched when an additional continuous-wave (cw) laser is applied. As the two beams excite the sample, the cw beam perturbs the intermediate step of the Er excitation mechanism either by photoionization of Er-related trapped carriers or by inducing an Auger effect between the trapped carriers and free carriers. %G English %L cea-00348676 %U https://cea.hal.science/cea-00348676 %~ CEA %~ CNRS %~ INSA-ROUEN %~ COMUE-NORMANDIE %~ IRAMIS-CIMAP %~ UNIROUEN %~ ENSICAEN %~ UNICAEN %~ INSA-GROUPE %~ CIMAP %~ OML-CIMAP %~ IRAMIS