Donor-modified multiple resonance emitters with accelerated reverse intersystem crossing towards high-efficiency and narrowband deep-blue OLEDs

Abstract

The development of blue thermally activated delayed fluorescence (TADF) emitters that can simultaneously achieve narrowband emission, high efficiency, and low efficiency roll-off in organic light-emitting diodes (OLEDs) remains a significant...

Acceptor modification of diindolocarbazole embedded multiple-resonance emitters for efficient narrowband deep-blue OLEDs with CIEy ≤ 0.08 and alleviated efficiency roll-off

“…2–4 Therefore, the development of pure deep-blue emitters with narrowband emission and high efficiency is increasingly prevalent due to their good potential to reduce power consumption and realize wide color gamut for UHD displays. 5–13 Recently, multiple-resonance (MR) organic emitters have emerged as promising candidates to overcome the drawbacks of conventional OLEDs driven by their efficient narrowband emission character. 14–28 By integrating an opposite resonance effect of the electron-donating unit and the electron-withdrawing unit in a fused polycyclic framework, the MR effect could be triggered, which minimizes the bonding/antibonding character and suppresses the vibronic coupling between the ground (S 0 ) and the lowest excited singlet (S 1 ) states, giving rise to guaranteed sharpened spectra.…”