Abstract
Nonconjugated bipolar transport polymers have been developed as host materials for electroluminescent devices by incorporating both electron-transporting and hole-transporting functionalities into copolymers. The random copolymer PCt-nvk3-7 containing mesogen-jacketed segment of P-Ct have been synthesized and characterized. The effect of mesogen-jacketed segment content of these bipolar copolymers on device performance has been investigated. The results of polymer light-emitting diodes (PLEDs) show that the jacketed content of copolymers has a significant effect on device performance: lowering charge transport and facilitating the hole-electron recombination leads to much higher current efficiency. Applying these high triplet random copolymers as host, the maximum current efficiency of 0.70 cd/A and the maximum brightness of 1872.8 cd/m2 was achieved for PCt-nvk3-7 with an orange-emitting complex dopant. The results suggest that the bipolar copolymers PCt-nvks can be good host polymers for electrophosphorescent devices.
| Original language | English |
|---|---|
| Pages (from-to) | 7861-7867 |
| Number of pages | 7 |
| Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
| Volume | 46 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 1 Dec 2008 |
| Externally published | Yes |
Keywords
- Light-emitting diodes (LED)
- Liquid-crystalline polymers (LCP)
- Luminescence