TY  - EJOUR
AU  - Jo, Seunghyeon 
AU  - Park, Sangwook 
AU  - Kwon, Hyukmin 
AU  - Lee, Hayoon 
AU  - Lee, Kiho 
AU  - Park, Jongwook 
TI  - Synthesis and Electrical Properties of a New Bipolar Material Using Spacer Moiety
T2  - Applied Sciences
PY  - 2024
VL  - 14
IS  - 9
SN  - 2076-3417
AB  - To develop a deep-blue emitter, a molecule with bipolar characteristics was designed as a donor-spacer-acceptor type, in which 9-(4-(4,6-diphenyl-1),3,5-triazin-2-yl)-2,5-dimethylphenyl)-9H-carbazole (DTPCZ)—with carbazole as an electron donating group and a diphenyl triazine moiety as an electron accepting group—was successfully synthesized. The photoluminescence (PL) maxima of DTPCZ were 421 nm in the solution state and 425 nm in the film state, indicating emission in the deep-blue region. DTPCZ also exhibited high thermal stability, with a degradation temperature of 349 °C. To confirm the electroluminescence (EL) characteristics, DTPCZ was applied as a dopant at 10, 20, and 30 wt% in a blue-fluorescent organic light-emitting diode (OLED) device. The highest efficiency was achieved using the 20 wt% doped device, with a current efficiency of 1.2 cd/A, an external quantum efficiency of 2.3%, and a Commission Internationale de l’Eclairage proceedings y-value of 0.06. Thus, deep-blue emission could be realized in the film state. These molecular design strategies can be applied to various fields, such as organic semiconductors.
KW  - organic light-emitting diodes
KW  - blue emission
KW  - bipolar
KW  - charge transfer
DO  - 10.3390/app14093593
ER  -