Highly efficient deep-blue organic light-emitting diodes (OLEDs) based on hot-exciton materials with multiple triplet exciton conversion channels

Abstract

High-energy triplet exciton conversion, high exciton utilization efficiency and high device efficiency were achieved through multiple hot-exciton conversion channels.

Rational design of hybridized local and charge transfer emitters towards deep blue emission by incorporating extra cyano-based acceptor moieties

“…For 2(3ph)-phCz, another introduction of 3ph group provides a larger steric hindrance, which leads to 2(3ph)-phCz possessing relatively loose molecular packing compared to 3ph-phCz. 36 As for 2(3phCN)-phCz, the additional unit (3phCN) provided a large steric hindrance to endow 2(3phCN)-phCz with a relatively loose molecular packing, which easily leads to configurational relaxation of the excited state to enhance the nonradiative process and lowers the PLQY in films.…”

Oxygen-bridged triarylboron substituted anthracene emitters with high-lying triplet–singlet intersystem crossing for efficient deep-blue OLEDs

“…25 By modifying anthracene with various donor (D) and/or acceptor (A) groups, the excited state properties can be tuned to enhance the hRISC process. 26–29 However, most anthracene-based hot exciton emitters have difficulty in achieving a high EQE in deep-blue light emission, and they usually have a relatively large full width at half maximum (FWHM) resulting in low color purity.…”