Abstract
Poly(fluorene-co-fluorenone)s containing high contents of fluorenone chromophore were synthesized by the Suzuki coupling reaction to study their electroluminescent (EL) properties. The copolymers are thermally stable below 430°C (Td) in nitrogen atmosphere. In film state, their absorption and photoluminescence spectra (peaked at 373-382 nm and 562-564 nm, respectively) are mainly originated from fluorenone units, because of its efficient energy transfer. Both LUMO and HOMO energy levels, estimated from their cyclic voltammograms, are lowered slightly (-3.17→-3.23 eV, -5.84→-5.89 eV) with increasing contents of electron-withdrawing fluorenone units. Double-layer EL devices, using the copolyfluorenes or their blends with poly(9,9-dihexylfluorene) (PF) as emitting layer, show exclusive emission originated from fluorenone chromophore (565 nm) when its content is high. Blending 0.02-5 wt % of PF-33 (fluorenone fraction: 0.37) with PF greatly enhances device performance (610 cd m-2 → 4400 cd m-2 and 0.45 cd A-1 → 1.52 cd A-1). Our results demonstrate that the copolyfluorenes are promising emitting materials for EL devices by simple blending.
| Original language | English |
|---|---|
| Pages (from-to) | 2576-2583 |
| Number of pages | 8 |
| Journal | Journal of Applied Polymer Science |
| Volume | 119 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2011 Mar 5 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Surfaces, Coatings and Films
- Polymers and Plastics
- Materials Chemistry
Cite this
}
Synthesis of copolyfluorenes with high fluorenone contents and its application in electroluminescent device by simple blending. / Wu, Jyun Ru; Chen, Yun; Wu, Tzi Yi.
In: Journal of Applied Polymer Science, Vol. 119, No. 5, 05.03.2011, p. 2576-2583.Research output: Contribution to journal › Article
TY - JOUR
T1 - Synthesis of copolyfluorenes with high fluorenone contents and its application in electroluminescent device by simple blending
AU - Wu, Jyun Ru
AU - Chen, Yun
AU - Wu, Tzi Yi
PY - 2011/3/5
Y1 - 2011/3/5
N2 - Poly(fluorene-co-fluorenone)s containing high contents of fluorenone chromophore were synthesized by the Suzuki coupling reaction to study their electroluminescent (EL) properties. The copolymers are thermally stable below 430°C (Td) in nitrogen atmosphere. In film state, their absorption and photoluminescence spectra (peaked at 373-382 nm and 562-564 nm, respectively) are mainly originated from fluorenone units, because of its efficient energy transfer. Both LUMO and HOMO energy levels, estimated from their cyclic voltammograms, are lowered slightly (-3.17→-3.23 eV, -5.84→-5.89 eV) with increasing contents of electron-withdrawing fluorenone units. Double-layer EL devices, using the copolyfluorenes or their blends with poly(9,9-dihexylfluorene) (PF) as emitting layer, show exclusive emission originated from fluorenone chromophore (565 nm) when its content is high. Blending 0.02-5 wt % of PF-33 (fluorenone fraction: 0.37) with PF greatly enhances device performance (610 cd m-2 → 4400 cd m-2 and 0.45 cd A-1 → 1.52 cd A-1). Our results demonstrate that the copolyfluorenes are promising emitting materials for EL devices by simple blending.
AB - Poly(fluorene-co-fluorenone)s containing high contents of fluorenone chromophore were synthesized by the Suzuki coupling reaction to study their electroluminescent (EL) properties. The copolymers are thermally stable below 430°C (Td) in nitrogen atmosphere. In film state, their absorption and photoluminescence spectra (peaked at 373-382 nm and 562-564 nm, respectively) are mainly originated from fluorenone units, because of its efficient energy transfer. Both LUMO and HOMO energy levels, estimated from their cyclic voltammograms, are lowered slightly (-3.17→-3.23 eV, -5.84→-5.89 eV) with increasing contents of electron-withdrawing fluorenone units. Double-layer EL devices, using the copolyfluorenes or their blends with poly(9,9-dihexylfluorene) (PF) as emitting layer, show exclusive emission originated from fluorenone chromophore (565 nm) when its content is high. Blending 0.02-5 wt % of PF-33 (fluorenone fraction: 0.37) with PF greatly enhances device performance (610 cd m-2 → 4400 cd m-2 and 0.45 cd A-1 → 1.52 cd A-1). Our results demonstrate that the copolyfluorenes are promising emitting materials for EL devices by simple blending.
UR - http://www.scopus.com/inward/record.url?scp=78649942818&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78649942818&partnerID=8YFLogxK
U2 - 10.1002/app.32705
DO - 10.1002/app.32705
M3 - Article
VL - 119
SP - 2576
EP - 2583
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
SN - 0021-8995
IS - 5
ER -