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Challenges encompass the enhancement of storage capacity limits and the evolution to a smart label for mobile devices decryption applications. Organic\u2013inorganic hybrids with europium (Eu<jats:sup>3+<\/jats:sup>) and terbium (Tb<jats:sup>3+<\/jats:sup>) ions are processed as luminescent QR codes that are able to simultaneously double the storage capacity and sense temperature in real time using a photo taken with the charge\u2010coupled device of a smartphone. The methodology based on the intensity of the red and green pixels of the photo yields a maximum relative sensitivity and minimum temperature uncertainty of the QR code sensor (293 K) of 5.14%\u2009\u00b7\u2009K<jats:sup>\u22121<\/jats:sup> and 0.194 K, respectively. As an added benefit, the intriguing performance results from energy transfer involving the thermal coupling between the Tb<jats:sup>3+<\/jats:sup>\u2010excited level (<jats:sup>5<\/jats:sup>D<jats:sub>4<\/jats:sub>) and the low\u2010lying triplet states of organic ligands, being the first example of an intramolecular primary thermometer. A mobile app is developed to materialize the concept of temperature reading through luminescent QR codes.<\/jats:p>","DOI":"10.1002\/advs.201900950","type":"journal-article","created":{"date-parts":[[2019,8,9]],"date-time":"2019-08-09T04:09:24Z","timestamp":1565323764000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":91,"title":["Luminescence Thermometry on the Route of the Mobile\u2010Based Internet of Things (IoT): How Smart QR Codes Make It Real"],"prefix":"10.1002","volume":"6","author":[{"given":"Jo\u00e3o F. C. 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