| 초록 |
The blue fluorescent material used in the existing organic light emitting diode(OLED) has very low fluorescence efficiency due to the exciton generation mechanism. If the energy gap between S1 and T1 is very small, the fluorescence efficiency can be greatly improved by thermally activated delayed fluorescence caused by a phenomenon called reverse intersystem crossing (RISC). In this study, a blue TADF dopants were synthesized by introducing a substituent into a DABNA-based molecular structure in which HOMO and LUMO were separated by multi resonance effect for the purpose of improving fluorescence efficiency. The synthesis of dopants was confirmed by infrared spectroscopy and nuclear magnetic resonance, and quantum yield and full width at half maximum (FWHM) were measured using fluorescence spectroscopy to evaluate fluorescence efficiency and color purity. Respectively, and Thermal oxidation and photooxidation stability were examined using a convection oven and an optical microscope. |
