10.5281/zenodo.5013844
https://zenodo.org/records/5013844
oai:zenodo.org:5013844
Martínez, Eduardo D.
Eduardo D.
Martínez
"Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil
Brites, Carlos D. S.
Carlos D. S.
Brites
Physics Department and CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
Carlos, Luís D.
Luís D.
Carlos
García-Flores, Alí F.
Alí F.
García-Flores
"Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil
Urbano, Ricardo R.
Ricardo R.
Urbano
"Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil
Rettori, Carlos
Carlos
Rettori
"Gleb Wataghin" Institute of Physics (IFGW), University of Campinas (UNICAMP), 13083-859, Campinas, SP, Brazil
Electrochromic Switch Devices Mixing Small- and Large-Sized Upconverting Nanocrystals
Zenodo
2018
optoelectronic devices
upconversion nanoparticles
electrothermal control
silver nanowires
high thermal sensitivity
2018-12-20
eng
10.5281/zenodo.5013843
https://zenodo.org/communities/eu
Creative Commons Attribution 4.0 International
The hasty progress in smart, portable, flexible, and transparent integrated electronics and optoelectronics is currently one of the driving forces in nanoscience and nanotechnology. A promising approach is the combination of transparent conducting electrode materials (e.g., silver nanowires, AgNWs) and luminescent nanoparticles. Here, tunable electrochromic transparent devices covering a broad range of the chromatic diagram are fabricated by combining the electrical control of the heat dissipation in AgNWs networks with size-dependent thermal properties of upconverting nanoparticles (UCNPs). The electrochromic devices are based on transparent nanocomposite films of poly(methyl methacrylate) and AgNWs covered by UCNPs of different sizes and compositions. As illustrative examples, devices mixing large-sized (>70 nm) β-NaYF4:Yb,Ln and small-sized (<15 nm) NaGdF4:Yb,Ln@NaYF4 core@shell UCNPs (Ln=Tm, Er, Ce/Ho) are presented. The temperature-dependent emission of the particles is monitored by the intensity ratio of the Er3+ 2H11/2 and 4S3/2 ® 4I15/2 emission lines, while externally controlling the current flow in the AgNWs network. Moreover, by defining a new thermometric parameter involving the intensity ratio of transitions from large- and small-sized UCNPs, a relative thermal sensitivity of 5.88 % K−1 (at 339 K) is obtained; a 6-fold improvement over the values reported so far.
This project has received funding from the European Union's Horizon 2020 FET Open programme under grant agreement No 801305 (NanoTBTech).
European Commission
10.13039/501100000780
801305
Nanoparticles-based 2D thermal bioimaging technologies