| Full text | |
| Author(s): |
de Azevedo, Diego
[1]
;
Freitas, Jilian Nei
[2]
;
Domingues, Raquel Aparecida
[1, 3]
;
Faleiros, Marcelo Meira
[1]
;
Atvars, Teresa Dib Zambon
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Estadual Campinas, UNICAMP, Chem Inst, POB 6154, BR-13084971 Campinas, SP - Brazil
[2] Ctr Informat Technol Renato Archer CTI, Rodovia D Pedro 1, Km 143, 6, BR-13069901 Campinas, SP - Brazil
[3] Univ Fed Sao Paulo, Inst Ciencia & Tecnol, Campus Sao Jose dos Campos, R Talim 330, BR-12231280 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Synthetic Metals; v. 233, p. 28-34, NOV 2017. |
| Web of Science Citations: | 5 |
| Abstract | |
The electroluminescent (EL) properties of two polyfluorene-based (poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) and poly{[}(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo{[}2,1,3]thiadiazol- 4,8-diyl)] (F8BT)) organic light-emitting diodes (OLEDs) were investigated. Two diode configurations were tested: blends with emissive layers of PFO (higher weight percentage, from 98 to 99.8 wt.%) and F8BT (lower weight percentage, from 0.2 to 2 wt.%) and bilayers of PFO/F8BT. To understand the diode performances, we compared the photoluminescence (PL) and the EL emissions of both configurations. PL emission decays showed that the fluorescence resonant energy transfer (FRET) efficiency is higher for blends that have less of the F8BT component than in bilayers. For the bilayer systems, however, the FRET efficiency is approximately 50%, confirming the significant inter-penetration of these two polymers. Upon decreasing the F8BT concentration in the blend or the F8BT film thickness in the bilayer, the EL emission shifted toward the blue color due to a more significant contribution from the PFO emission. The EL color can be tuned between green (from the F8BT) and blue (from the PFO) shades by adjusting the polymer composition. The differences between the PL and EL band profiles were discussed. (AU) | |
| FAPESP's process: | 13/16245-2 - Photophysical properties of thin films of conjugated polymers |
| Grantee: | Teresa Dib Zambon Atvars |
| Support Opportunities: | Regular Research Grants |