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The emission quantum yield of upconverting materials is still not widely reported due to technical difficulties and intricate dependence on the excitation power density that is mirrored in a temperature increase. This work describes the simultaneous determination of the emission quantum yield (for both downshifting and upconverting processes) and of the temperature by using the output of a commercial integrating sphere. The temperature is calculated by primary luminescence thermometry through the Boltzmann equation, analyzing the intensity ratio between the <jats:sup>2<\/jats:sup>H<jats:sub>11\/2<\/jats:sub>, <jats:sup>4<\/jats:sup>S<jats:sub>3\/2<\/jats:sub>\u2192<jats:sup>4<\/jats:sup>I<jats:sub>15\/2<\/jats:sub> transitions. The procedure is illustrated using of SrF<jats:sub>2<\/jats:sub>: Yb<jats:sup>3+<\/jats:sup>\/Er<jats:sup>3+<\/jats:sup> single crystals with distinct Yb<jats:sup>3+<\/jats:sup> compositions and the effect of the Yb<jats:sup>3+<\/jats:sup> content on the emission quantum yield and the temperature increase of the sample.<\/jats:p>","DOI":"10.1002\/ejic.202000113","type":"journal-article","created":{"date-parts":[[2020,2,18]],"date-time":"2020-02-18T12:38:19Z","timestamp":1582029499000},"page":"1555-1561","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Simultaneous Measurement of the Emission Quantum Yield and Local Temperature: The Illustrative Example of SrF<sub>2<\/sub>:Yb<sup>3+<\/sup>\/Er<sup>3+<\/sup> Single Crystals"],"prefix":"10.1002","volume":"2020","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9636-2628","authenticated-orcid":false,"given":"Carlos D. 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