Multiple Fusion Strategy for High‐Performance Yellow OLEDs with Full Width at Half Maximums Down to 23 nm and External Quantum Efficiencies up to 37.4%. Issue 7 (18th December 2022)

• Record Type: Journal Article
• Authors: Zhang, Yuewei; Wei, Jinbei; Wang, Lu; Huang, Tianyu; Meng, Guoyun; Wang, Xiang; Zeng, Xuan; Du, Mingxu; Fan, Tianjiao; Yin, Chen; Zhang, Dongdong; Duan, Lian
• Is Part Of: Advanced materials. Volume 35:Issue 7(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-18
• Subjects: high efficiency -- multiple fusion strategy -- multiple resonance -- narrowband yellow emission -- organic light‐emitting diodes; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202209396
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The pursuit of ideal narrowband yellow multiple resonance (MR) emitters is hampered by the mutual constraints of effective spectral redshift and maintaining a small full width at half maximum (FWHM) value. Here, a novel multiple fusion molecular design strategy is reported to break this trade‐off. Compared with the selected narrowband parent core, the specific multiple MR effects in target molecules can simultaneously extend the π‐conjugation length, increase the rigidity of the structure, and reduce the vibrational frequency. Proof‐of‐the‐concept emitters BN‐DICz and DBN‐ICz show bright yellowish green to yellow emissions in dilute toluene solutions with peaks at 533–542 nm and extremely small FWHMs of ≤20 nm. Notably, BN‐DICz‐based electroluminescent device exhibits excellent efficiencies of 37.4%, 136.6 cd A −1, and 119.2 lm W −1 with an FWHM of merely 23 nm, representing the best performance for yellow MR organic light‐emitting diodes. Abstract : Toward the goal of ideal narrowband yellow emission, a novel "multi‐fusion" design strategy is proposed to break the trade‐off between spectral redshift and broadening. The corresponding electroluminescent device exhibits leading performance in yellow multi‐resonance (MR) devices, with peak efficiencies of 37.4%, 136.6 cd A −1, and 119.2 lm W −1 and FWHM of only 23 nm.