| 초록 |
OLED device was fabricated by using TBADN, MADN and ADN, the derivatives of ADN that is a commercial blue emitting material in the OLEDs field. The emitting layer was formed through a deposition method or a spin-coating method, and its efficiencies were compared. In the deposition device, TBADN, MADN and ADN all showed high efficiencies of 4.6–7.0 cd=A. In the case of the spin-coated device, TBADN and MADN showed normal efficiencies of 1.5–2.1 cd=A. However, in the case of ADN, no light was emitted. Therefore, film surface was observed to investigate the correlation of film morphological characteristics and device efficiency through SEM experiment. In the case of the spin-coated film, TBADN and MADN showed an amorphous smooth surface, but in the case of ADN, crystallized domain was shown. Therefore, for the case of ADN spin-coated device, it is analyzed that film roughness increases and no light is emitted due to leakage current. |
