| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| 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.
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