Abstract
Luminescence properties of a type of polyfluorene copolymer (PFO-DBT5) used for white-light organic light emitting device (OLED) were studied and discussed, in which a very low concentration of 0.05 mol% 4,7-bithienyl-2,1,3- benzothiadiazole (DBT) molecules were inserted in polyfluorene chain as orange-light unit. From the spectroscopic analysis of PFO-DBT5 in solution and nanoparticles, it is concluded that inter-chain Förster energy transfer from polyfluorene segments to DBT units play major role in process of white-light emission of PFO-DBT5. By measurement of electroluminescent properties, it is found that annealing of PFO-DBT5 film in vacuum is favorable for improving white-light emission owing to enhancement in inter-chain Förster energy transfer. CIE coordinates (0.38, 0.33) were obtained under the annealing temperature of 140°C. It was found that the annealing temperature affects the luminance and efficiency of white-light OLED. The optimum annealing temperature was 100°C.
| Original language | English |
|---|---|
| Pages (from-to) | 827-838 |
| Number of pages | 12 |
| Journal | Organic Electronics |
| Volume | 14 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2013 |
| Externally published | Yes |
Keywords
- Förster energy transfer
- OLED
- Polyfluorene
- Vacuum healing
- White-light
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