| Full text | |
| Author(s): |
Martinez, Eduardo D.
[1]
;
Brites, Carlos D. S.
[2, 3]
;
Carlos, Luis D.
[2, 3]
;
Garcia-Flores, Ali F.
[1]
;
Urbano, Ricardo R.
[1]
;
Rettori, Carlos
[4, 1]
Total Authors: 6
|
| Affiliation: | [1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys IFGW, BR-13083859 Campinas, SP - Brazil
[2] Univ Aveiro, Dept Phys, P-3810193 Aveiro - Portugal
[3] Univ Aveiro, CICECO Aveiro Inst Mat, P-3810193 Aveiro - Portugal
[4] Univ Fed ABC, CCNH, BR-09210580 Santo Andre, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | ADVANCED FUNCTIONAL MATERIALS; v. 29, n. 8 FEB 21 2019. |
| Web of Science Citations: | 11 |
| Abstract | |
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 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-dependent thermal properties of UCNPs, tunable electrochromic transparent devices covering a broad range of the chromatic diagrams are fabricated. As illustrative examples, devices mixing large-sized (>70 nm) beta-NaYF4:Yb,Ln and small-sized (<15 nm) NaGdF4:Yb,Ln@NaYF4 core@shell UCNPs (Ln = Tm, Er, Ce/Ho) are presented, permitting to monitor the temperature-dependent emission of the particles by the intensity ratio of the Er3+ 2H11/2 and S-4(3/2) -> I-4(15/2) 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- and small-sized UCNPs, a relative thermal sensitivity of 5.88% K-1 (at 339 K) is obtained, a sixfold improvement over the values reported so far. (AU) | |
| FAPESP's process: | 15/23882-4 - PLASMONIC EFICIENCY INTENSIFICATION OF THE UPCONVESION IN NANOCRYSTAIS DOPED WITH RARE EARTHS. |
| Grantee: | Eduardo David Martínez |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 12/04870-7 - Studies of novel complex and advanced materials |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/21289-4 - Multi-User Equipment in grant 12/04870-7 - desktop X-ray powder diffractometer |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 12/05903-6 - Nuclear magnetic resonance of novel complex and advanced materials in condensed matter physics |
| Grantee: | Ricardo Rodrigues Urbano |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 15/21290-2 - Multi-User Equipment in grant 12/04870-7 - dynamic light scattering analyser Horiba SZ-100Z |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach |
| Grantee: | Carlos Rettori |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/12489-8 - Ultra high sensitivity upconversion nanoparticles for optical nanotermometry and thermochromaticity |
| Grantee: | Eduardo David Martínez |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |