P‐258: <i>Late‐News Poster:</i> Rational Materials Design Towards Singlet‐Only Fluorescent OLEDs: Overcoming Traditional Spin Statistics

Efficient and durable deep blue emitters remain a critical bottleneck in OLED technology. Current approaches, such as triplet‐triplet‐fusion, thermally activated delayed fluorescence, hyperfluorescence, and phosphorescent systems, struggle with limited efficiency, stability issues, complex layer requirements, or limited industrial viability, primarily due to the persistence of harmful long‐lived triplet states. We present a Singlet‐Only emission system that promises to circumvent these challenges by leveraging an energetic resonance condition to bypass spin statistics, efficiently mitigating triplet formation. This enables the generation of nearly 100 % singlets on simple fluorescent emitters and offers a promising pathway to advance the performance and longevity of blue OLED devices.