TY  - JOUR
T1  - New bipolar host materials using Phenanthro[9,10-d]oxazole moiety for highly efficient red phosphorescence
AU  - Kang, Seokwoo
AU  - Park, So-Ra
AU  - Suh, Min Chul
AU  - Park, Jongwook
JO  - Dyes and Pigments
VL  - 174
SP  - 108038
PY  - 2020
DA  - 2020/03/01/
SN  - 0143-7208
DO  - https://doi.org/10.1016/j.dyepig.2019.108038
UR  - https://www.sciencedirect.com/science/article/pii/S0143720819324581
AB  - Six new bipolar host materials including phenanthro[9,10-d]oxazole as an electron withdrawing unit and three different amine groups as electron donating units have been designed and synthesized for use in red phosphorescent organic light-emitting diodes (PhOLEDs). The synthesized materials showed PLmax at 397–455 nm and high thermal properties above the decomposition temperature (Td) of 320 °C. In addition, all six materials showed distinct oxidation-redox peaks as bipolar materials. These six new bipolar host materials are suitable for use in red PhOLEDs due to their triplet energy level (e.g., 2.2–2.5 eV). As a result, when the six new materials were used as host materials for red PhOLEDs, 24.0–29.4 cd/A maximum current efficiency, 16.5–19.3% external quantum efficiency, CIE (0.64, 0.35), and 610 nm ELmax were achieved.
ER  -