The advancement of Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials in the field of organic light-emitting diodes (OLEDs) has created excitement among scientists. Researchers in China have proposed an innovative interlayer sensitization strategy to enhance the electroluminescence (EL) efficiencies of blue MR-TADF emitters, leading to the development of blue hyperfluorescence OLEDs with exceptional color quality and high EL efficiencies.
While MR-TADF emitters show promise for OLEDs with narrow EL spectra, they often face challenges such as triplet-involved quenching processes that impact EL efficiencies. This issue has prompted researchers to explore new strategies, including the fabrication of hyperfluorescence OLEDs, to address the efficiency roll-offs associated with MR-TADF emitters.
In a recent publication in Light Science & Applications, a team of scientists led by Professor Zujin Zhao from South China University of Technology introduced an effective interlayer sensitization strategy for blue MR-TADF emitters. This approach involves separating the TADF sensitizer and MR-TADF emitter into two adjacent emitting layers with different hosts to optimize their performance.
By implementing the interlayer sensitization strategy, the team was able to fabricate high-performance hyperfluorescence OLEDs using various blue MR-TADF emitters and TADF sensitizers. These OLEDs produced strong blue light with narrow EL spectra and exhibited outstanding external quantum efficiencies (EQEs) of up to 38.8%, representing a significant improvement over unsensitized devices.
The successful development of blue hyperfluorescence OLEDs using the interlayer sensitization strategy highlights the potential for achieving high EL efficiency and color purity simultaneously. This innovative approach opens up new possibilities for the future of OLED technology, paving the way for the creation of advanced display and lighting applications.
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