2015 Fiscal Year Final Research Report
Syntesis of luminescent Cu(I) complexes for highly efficient OLEDs
| Project/Area Number |
25410080
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Inorganic chemistry
|
|---|
| Research Institution | Nippon Institute of Technology (2015)
The Institute of Physical and Chemical Research (2013-2014) |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | 遅延蛍光 / 銅一価錯体 / 有機EL / 発光量子収率 |
|---|
| Outline of Final Research Achievements |
Recently, thermally activated delayed fluorescent (TADF) materials with a small singlet-triplet (S-T) energy gap have attracted much attention because of their potential importance in manufacturing efficient organic light-emitting diodes (OLEDs). In this study, we found that the use of thiolate ligand with electron-donating character reduced the contribution of metal orbitals to the HOMOs of the tetrahedral Cu(I) complexes, decreasing the metal-to-ligand charge-transfer (MLCT) character of their excited states. As a result, TADF based on ligand-to-ligand charge-transfer (LLCT) transition was attained. Furthermore, we applied this strategy to the three-coordinate copper(I) system. The three-coordinate Cu(I) thiolate complexes emit intense blue green delayed fluorescence with high quantum yields of 1.0 both at 293 and 77 K in the solid state and the origin of TADF from these complexes is not conventional MLCT but LLCT transition.
|
| Free Research Field |
遷移金属錯体光化学
|
