Highly Efficient and Pure Blue Organic Light-emitting Diodes using Boron Free Emitters

The development of the ultrapure and highly efficient blue organic light-emitting diodes is a very critical issue in the organic light-emitting diodes. As an approach, boron-nitrogen based multi-resonance compounds have been developed. In this work, a new class of materials were designed and synthesized as the deep blue organic emitters for high efficiency organic light-emitting diodes. Only carbon and nitrogen were used to design the materials to induce the multi-resonance effect in the emitters. A deep blue color, a narrow emission spectrum and high efficiency by thermally activated delayed fluorescence were achieved using the new emitting materials.