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A promising approach is the combination of transparent conducting electrode materials (e.g., silver nanowires, AgNWs) and upconverting nanoparticles (UCNPs). Here, electrochromic devices based on transparent nanocomposite films of poly(methyl methacrylate) and AgNWs covered by UCNPs of different sizes and compositions are developed. By combining the electrical control of the heat dissipation in AgNW networks with size\u2010dependent thermal properties of UCNPs, tunable electrochromic transparent devices covering a broad range of the chromatic diagrams are fabricated. As illustrative examples, devices mixing large\u2010sized (&gt;70 nm) \u03b2\u2010NaYF<jats:sub>4<\/jats:sub>:Yb,Ln and small\u2010sized (&lt;15 nm) NaGdF<jats:sub>4<\/jats:sub>:Yb,Ln@NaYF<jats:sub>4<\/jats:sub> core@shell UCNPs (Ln = Tm, Er, Ce\/Ho) are presented, permitting to monitor the temperature\u2010dependent emission of the particles by the intensity ratio of the Er<jats:sup>3+ 2<\/jats:sup>H<jats:sub>11\/2<\/jats:sub> and <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> emission lines, while externally controlling the current flow in the AgNW network. Moreover, by defining a new thermometric parameter involving the intensity ratio of transitions of large\u2010 and small\u2010sized UCNPs, a relative thermal sensitivity of 5.88% K<jats:sup>\u22121<\/jats:sup> (at 339 K) is obtained, a sixfold improvement over the values reported so far.<\/jats:p>","DOI":"10.1002\/adfm.201807758","type":"journal-article","created":{"date-parts":[[2018,12,20]],"date-time":"2018-12-20T05:30:41Z","timestamp":1545283841000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":80,"title":["Electrochromic Switch Devices Mixing Small\u2010 and Large\u2010Sized Upconverting Nanocrystals"],"prefix":"10.1002","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5834-4389","authenticated-orcid":false,"given":"Eduardo D.","family":"Mart\u00ednez","sequence":"first","affiliation":[{"name":"\u201cGleb Wataghin\u201d Institute of Physics (IFGW) University of Campinas (UNICAMP)  13083\u2010859 Campinas SP Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9636-2628","authenticated-orcid":false,"given":"Carlos D. S.","family":"Brites","sequence":"additional","affiliation":[{"name":"Physics Department and CICECO\u2010Aveiro Institute of Materials University of Aveiro  3810\u2010193 Aveiro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4747-6535","authenticated-orcid":false,"given":"Lu\u00eds D.","family":"Carlos","sequence":"additional","affiliation":[{"name":"Physics Department and CICECO\u2010Aveiro Institute of Materials University of Aveiro  3810\u2010193 Aveiro Portugal"}]},{"given":"Al\u00ed F.","family":"Garc\u00eda\u2010Flores","sequence":"additional","affiliation":[{"name":"\u201cGleb Wataghin\u201d Institute of Physics (IFGW) University of Campinas (UNICAMP)  13083\u2010859 Campinas SP Brazil"}]},{"given":"Ricardo R.","family":"Urbano","sequence":"additional","affiliation":[{"name":"\u201cGleb Wataghin\u201d Institute of Physics (IFGW) University of Campinas (UNICAMP)  13083\u2010859 Campinas SP Brazil"}]},{"given":"Carlos","family":"Rettori","sequence":"additional","affiliation":[{"name":"\u201cGleb Wataghin\u201d Institute of Physics (IFGW) University of Campinas (UNICAMP)  13083\u2010859 Campinas SP Brazil"},{"name":"CCNH, Universidade Federal do ABC (UFABC)  Santo Andr\u00e9 SP 09210\u2010580 Brazil"}]}],"member":"311","published-online":{"date-parts":[[2018,12,20]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1063\/PT.3.2913"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4CS00170B"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nnano.2015.251"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr400478f"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5NR08477F"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.200402046"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature08777"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr400425h"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4CS00177J"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.6b05331"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1039\/b905927j"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2017.06.025"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/nn100244a"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1039\/C2CS35288E"},{"key":"e_1_2_8_15_1","first-page":"33","volume":"8","author":"Lu Y. 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