Uoyama, H., Goushi, K., Shizu, K., Nomura, H. Perpheral decoration of multi-resonance molecules as a versatile approach for simultaneous long-wavelength and narrowband emission. Multi-resonance deep-red emitters with shallow potential-energy surfaces to surpass energy-gap law. Molecular design of thermally activated delayed fluorescent emitters for narrowband orange–red OLEDs boosted by a cyano-functionaliztion strategy. Highly efficient electroluminescent materials with high color purity based on strong acceptor attachment onto B-N-containing multiple resonance frameworks. Full-color, narrowband, and high-efficiency electroluminescence from boron and carbazole embedded polycyclic heteroaromatics. Multi-resonance induced thermally activated delayed fluorophores for narrowband green OLEDs. Peripheral amplification of multi-resonance induced thermally activated delayed fluorescence for highly efficient OLEDs. Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter. Multiresonant thermally activated delayed fluorescence emitters based on heteroatom-doped nanographenes: recent advances and prospects for organic light-emitting diodes. Ultrapure blue thermally activated delayed fluorescence molecules: efficient HOMO–LUMO separation by the multiple resonance effect. Furthermore, the outstanding capability to harvest triplet excitons also enables BNSeSe to be a superior sensitizer for a hyperfluorescence OLED, which shows state-of-the-art performance with a high excellent external quantum efficiency of 40.5%, power efficiency beyond 200 lm W −1, and luminance close to 20,0000 cd m −2. The corresponding green OLEDs exhibit excellent external quantum efficiencies of up to 36.8% and ultra-low roll-off character at high brightnesses (with very small roll-off values of 2.8% and 14.9% at 1,000 cd m −2 and 10,000 cd m −2, respectively). Here we report a heavy-atom incorporating emitter, BNSeSe, which is based on a selenium-integrated boron–nitrogen skeleton and exhibits 100% photoluminescence quantum yield and a high RISC rate ( k RISC) of 2.0 × 10 6 s −1. However, at high brightness operation, efficiency roll-off attributed to the slow reverse intersystem crossing (RISC) process hinders the use of multiresonance-induced thermally activated delayed fluorescent materials in practical applications. Organic light emitters based on multiresonance-induced thermally activated delayed fluorescent materials have great potential for realizing efficient, narrowband organic light-emitting diodes (OLEDs).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |