Through-space charge transfer in luminophore based on phenyl-linked carbazole- and phthalimide moieties utilized in cyan-emitting OLEDs

Aromatic imide/amide-based organic small-molecule emitters for organic light-emitting diodes

“…Recently, given the donor substitution on the nitrogen atom, TADF and AIE were integrated to design the compound PHI-5 using carbazole as the donor and PHI as the acceptor. 34 The PLQY value of PHI-5 in solids was significantly higher than 20%.…”

“…Like NAI-1, similar to PHI-5, the D-p-A structure was formed by introducing an N-substituted p-bridged carbazole. 34 However, the PLQY value of the NAI-1 solid sample was negligible, much lower than that of PHI-5. This might be ascribed to inefficient CT through space and a low localized triplet level.…”

“…PHI is the benzene ring fusion on the MAI backbone to increase the degree of conjugation and realize the regulation of luminescence properties. Recently published studies 29,[32][33][34][35] showed that emitters based on PHI were mainly constructed according to the D-A structure endowed with TADF properties. The structural design can be tuned by the introduction of substituents on the nitrogen atom and the benzene ring.…”

A 9-fluorenyl substitution strategy for aromatic-imide-based TADF emitters towards efficient and stable sky blue OLEDs with nearly 30% external quantum efficiency

“…Besides, the aromatic imide-based semiconductors have been intensively investigated for their applications in organic optoelectronics due to the outstanding photoelectric properties and strong electron-withdrawing ability. [20][21][22][23][24][25] However, aromatic imide-based blue TADF emitters have been rarely reported; 26,27 therefore, a rational molecular design is fairly important for the purpose of preparing efficient stable aromatic-imide-based blue TADF luminophores. Considering all of these in perspective, we herein propose a 9-fluorenyl substitution strategy for constructing phthalimide-based blue TADF molecules with a carbazole unit as the electron donor.…”

Long‐Persistent Luminescence from an Exciplex‐Based Organic Light‐Emitting Diode

“…[ 29 ] Moreover, high EQE values were reported by using exciplex as hosts for phosphorescence and TADF emitters. [ 30,31 ]…”