Bromine-substituted triphenylamine derivatives with improved hole-mobility for highly efficient green phosphorescent OLEDs with a low operating voltage
Du, X; Zhao, J; Liu, Wei; Wang, Kai; Yuan, S; Zheng, C; Lin, Hui; Tao, S; Zhang, XH
| HERO ID | 3576206 |
|---|---|
| In Press | No |
| Year | 2016 |
| Title | Bromine-substituted triphenylamine derivatives with improved hole-mobility for highly efficient green phosphorescent OLEDs with a low operating voltage |
| Authors | Du, X; Zhao, J; Liu, Wei; Wang, Kai; Yuan, S; Zheng, C; Lin, Hui; Tao, S; Zhang, XH |
| Volume | 4 |
| Issue | 43 |
| Page Numbers | 10301-10308 |
| Abstract | Charge transport materials play a crucial role in organic light-emitting diodes (OLEDs) due to their effect on reducing the operating voltage and enhancing the power efficiency. To develop hole transport materials with improved hole-mobility, two novel bromine-substituted triphenylamine derivatives: ((4-bromo-phenyl)-bis-(4-quinolin-8-yl-phenyl)-amine) Br-DQTPA and (9,9-bis-(4-triphenyl-amine)-2,7-dibromo-9H-fluorene) Br-DTF were designed and synthesized. The hole mobilities of Br-DQTPA and Br-DTF show one order of magnitude enhancement compared with non-brominated (phenyl-bis(4-quinolin-8-yl-phenyl)-amine) DQTPA and (9,9-bis-(4-triphenyl-amine)-9H-fluorene) DTF under the same electric field. Attributed to their improved hole mobilities, traditional green phosphorescent OLEDs that use Br-DQTPA or Br-DTF as a hole transport material both show an ultralow operating voltage at 1 cd m(-2) (below 2.4 V) and very high luminous efficiencies (over 21% and 90 lm W-1) without light outcoupling improvement. Those results are much better than those of DQTPA-, DTF-, and even NPB-based green devices, indicating that bromine-substitution is a promising and convenient way to achieve novel hole transport materials with improved hole-mobility. |
| Doi | 10.1039/c6tc03020c |
| Wosid | WOS:000387906600014 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Journal:JOURNAL OF MATERIALS CHEMISTRY C 2050-7526 |
| Is Public | Yes |