Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 6, Pages 1343-1348Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc04852a
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Funding
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20154010200830]
- Korea Government Ministry of Trade, Industry and Energy
- Industrial Strategic Technology Development Program of MKE/KEIT [10048317]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20154010200830, 10048317] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this communication, we report an excellent new highly conjugated and rigid electron donor (diindolocarbazole) for thermally activated delayed fluorescence (TADF) emitters. The donor-acceptor structure with diindolocarbazole donor induces high oscillator strength as well as high probability for the radiative transition, suitable frontier molecular overlap with proper intramolecular charge transfer and a large dihedral angle with out-of-plane structure between electron donor and acceptor; this results in high photoluminescence quantum yield, small singlet-triplet energy splitting, and extremely short delayed fluorescence exciton lifetime. The fabricated organic light emitting diode with new donor applied green emitter exhibits a remarkably high external quantum efficiency of 31.4% without any out-coupling technique. It also shows extremely low efficiency rolloff characteristics with the highest luminance of 71160 cd m(-2) as well as good operational device stability.
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