Organic light-emitting diodes (OLEDs) have shown great promise in the field of display technology, with the potential to deliver high-quality images and energy-efficient performance. One of the key factors in achieving optimal OLED performance is the development of materials with narrow electroluminescence (EL) spectra. In this context, multi-resonance thermally activated delayed fluorescence (MR-TADF) materials have emerged as promising candidates due to their unique properties.

While MR-TADF emitters offer narrow EL spectra, they often suffer from serious triplet-involved quenching processes that can undermine EL efficiencies and lead to sharp efficiency roll-offs. This has prompted researchers to focus on developing strategies to address this issue, particularly by fabricating hyperfluorescence OLEDs.

In a recent study published in Light Science & Applications, a team of scientists from South China University of Technology proposed an innovative interlayer sensitization strategy to enhance the EL efficiencies of blue MR-TADF emitters in OLEDs. The strategy involves separating the TADF sensitizer and MR-TADF emitter into two adjacent emitting layers (EMLs) with different hosts, allowing for long-range Fӧrster energy transfer (FET) to sensitize the MR-TADF emitters.

The researchers successfully demonstrated the effectiveness of the interlayer sensitization strategy by developing high-performance hyperfluorescence OLEDs using various blue MR-TADF emitters and TADF sensitizers. These OLEDs exhibited strong blue light with narrow EL spectra and exceptional external quantum efficiencies (EQEs) of up to 38.8%, showcasing a significant improvement compared to unsensitized devices.

The results of this study highlight the potential of the interlayer sensitization strategy in enhancing the EL efficiencies of blue MR-TADF emitters for OLED applications. By effectively sensitizing MR-TADF emitters with TADF sensitizers through Fӧrster energy transfer, the researchers were able to achieve high color purity and efficiency in blue hyperfluorescence OLEDs simultaneously. This innovative approach opens up new possibilities for the development of next-generation OLED materials with improved performance characteristics.

Physics

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