Bright red emission from single layer polymer light-emitting devices based on blends of regioregular P3HT and F8BT

Bright red polymer light-emitting devices were fabricated with blends of regioregular poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) as an emission layer. The blend films that had more than 10 wt.% P3HT exhibit high device luminance (>10,000 cd/m 2) and eff...

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Bibliographic Details
Published in:Current applied physics 2005, 5(3), , pp.222-228
Main Authors: Kim, Youngkyoo, Bradley, Donal D.C.
Format: Article
Language:English
Subjects:
Blocking layer
F8BT
Förster radius
Quantum efficiency
Red polymer light-emitting device
Regioregular P3HT
Transient photoluminescence
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Summary:Bright red polymer light-emitting devices were fabricated with blends of regioregular poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) as an emission layer. The blend films that had more than 10 wt.% P3HT exhibit high device luminance (>10,000 cd/m 2) and efficiency (1.8 cd/A), consistent with a relatively large Förster radius for energy transfer from F8BT to P3HT. The emission colour was close to red but with a small orange component (CIE x=0.64, y=0.36). Effective blocking of electrons and excitons by inserting a blocking layer is expected to be necessary to achieve an electroluminescence efficiency commensurate with the photoluminescence quantum efficiency of the blend films (>17%).
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2003.11.090