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This up-converted photoluminescence was observed in samples intentionally doped with Tm ions, suggesting that the energy levels introduced by the rare earth ion in the ZnO band gap are responsible for this process.<\/jats:p>","DOI":"10.1063\/1.2128491","type":"journal-article","created":{"date-parts":[[2005,11,2]],"date-time":"2005-11-02T23:20:27Z","timestamp":1130973627000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":26,"title":["Up conversion from visible to ultraviolet in bulk ZnO implanted with Tm ions"],"prefix":"10.1063","volume":"87","author":[{"given":"T.","family":"Monteiro","sequence":"first","affiliation":[{"name":"Universidade de Aveiro Departamento de F\u00edsica , Aveiro, Portugal"}]},{"given":"A. J.","family":"Neves","sequence":"additional","affiliation":[{"name":"Universidade de Aveiro Departamento de F\u00edsica , Aveiro, Portugal"}]},{"given":"M. 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