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By comparing it with a reference sample of Eu-doped Y<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>, we find that the fraction of Eu<jats:sup>3+<\/jats:sup> ions that can emit light upon optical excitation is of the order of 1%. We also measure the quantum yield of the Eu-related photoluminescence and find this to reach (~10%) and (~3%) under continuous wave and pulsed excitation, respectively.<\/jats:p>","DOI":"10.1038\/srep05235","type":"journal-article","created":{"date-parts":[[2014,6,10]],"date-time":"2014-06-10T09:03:27Z","timestamp":1402391007000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Optical excitation and external photoluminescence quantum efficiency of Eu3+ in GaN"],"prefix":"10.1038","volume":"4","author":[{"given":"W. D. A. 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