Journal
RSC ADVANCES
Volume 8, Issue 31, Pages 17025-17033Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra01761a
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Funding
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea Government Ministry of Trade, Industry and Energy [20154010200830]
- Industrial Strategic Technology Development Program of MKE/KEIT [10048317]
- [NRF-2016R1A6A3A11930666]
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Two bipolar host materials, 8-(9H-carbazol-9-yl)-5-(pyridin- 2-yl)-5H- pyrido[3,2-b]indole (CzCbPy) and 5-(6 -(9H-carbazol- 9-yl)pyridin-2-yl)-8-(9H-carbazol-9-yl)-5H-pyrido[3,2-b]indole (2CzCbPy), were synthesized for deep blue thermally activated delayed fluorescence organic light emitting diodes (TADF OLEDs). Both CzCbPy and 2CzCbPy hosts possess bipolar characteristic with high polarity, which results in high delayed photoluminescence quantum yields by reducing the energy gap between singlet and triplet states of TADF materials. In addition, these hosts have high enough triplet energies of 3.05 eV to transfer exciton energy to a deep blue TADF emitter. A deep blue TADF OLED fabricated with a CzCbPy host exhibited high external quantum efficiency of 22.9% and low efficiency roll-off (19.2% at 1000 cd m(-2)).
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