Highly Efficient Deep Blue Fluorescent Organic Light-Emitting Diodes Boosted by Thermally Activated Delayed Fluorescence Sensitization

ACS Applied Materials & Interfaces
Dae Hyun AhnJang Hyuk Kwon

Abstract

Highly efficient deep blue fluorescent material and various thermally activated delayed fluorescent (TADF) blue sensitization materials were synthesized for fluorescent deep blue organic light-emitting diodes (OLEDs). These materials were designed and selected by considering efficient energy transfer conditions (i.e., spectral overlap and quantum efficiency) between sensitizer and acceptor. Energy transfer process from TADF host sensitizers to deep blue fluorescent emitter has been investigated by measuring the energy transfer rate. Measured energy transfer rate was to be 1.24 × 1010 s-1 (mol/dm3)-1 for a prompt decay of fluorescence and 2.61 × 108 s-1 (mol/dm3)-1 for delayed fluorescence, which demonstrated the efficient energy transfer. Indeed, highly efficient deep blue fluorescent OLEDs boosted by the TADF host-sensitization process were successfully fabricated. The maximum external quantum efficiency was 19.0% with color coordinates of (0.14, 0.15) and 15.5% with color coordinates of (0.15, 0.11) in the different host system. The efficiency roll-off characteristic and device operating lifetime were also improved by this efficient sensitization process.

References

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Citations

Dec 12, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Minghan CaiLian Duan
Apr 8, 2021·ACS Applied Materials & Interfaces·Young Hun JungJang Hyuk Kwon
Aug 25, 2018·The Journal of Physical Chemistry Letters·Lingfeng ChenWei Huang
Aug 21, 2021·Journal of Computational Chemistry·Yixiang CaoRichard A Friesner
Aug 28, 2020·ACS Applied Materials & Interfaces·Alexander M PolgarZachary M Hudson

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