Carbonyl‐containing derivatives show enduring vitality in the field of thermally activated delayed fluorescence (TADF) materials; they can realize high device efficiency by using both singlet and triplet excitons for electroluminescence. Recently, a system based on fused ketone/amine exhibited huge potential for constructing multi‐resonance TADF (MR‐TADF) emitters, which exhibit higher narrow‐band emission than conventional TADF emitters with twisted donor‐acceptor (D‐A) structure. Herein, we summarize current research progress in both traditional and MR‐type ketone derivatives with TADF characteristics for introducing the molecular design strategy of maintaining high device efficiency while keeping narrow‐band emission profile. We hope this review can inspire the emergence of more high‐performance narrow‐band materials.

High-definition display-based organic light-emitting diodes (OLEDs) call for narrowband emission from each pixel. Recently, the boron-based thermally activated delayed fluorescence (TADF) emitters soon attract the broad attention of the OLEDs...

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The molecular modification strategies for maintaining both high efficiency and narrow‐band profiles are highlighted by a review of the progress in iterations of carbonyl‐containing thermally activated delayed fluorescence (TADF) molecules from conventional TADF emitters with twisted donor‐acceptor structures to multi‐resonance TADF molecules with fused skeletons. For more details, see the Review by L.‐S. Liao, Z.‐Q. Jiang, et al. (DOI: 10.1002/chem.202202628).

Vapor‐phase growth methods, taking the advantages of producing high‐quality crystals with low defects, thin thickness, and homogeneous composition, are of great significance in the field of organic crystal growth and their high‐performance applications. At present, the requirements for organic crystals as building blocks for the construction of optoelectronic devices are increasing with the constant advances in organic optoelectronics. Therefore, the vapor‐phase growth method would become one of the practical techniques that cannot be ignored to fabricate organic crystals. In this paper, an overview of different vapor‐phase growth methods for the preparation of organic single crystals is provided. An introduction to the current status of the vapor phase method is presented and the view on the challenges it faces with some promising solution ideas. It is believed that this review will serve as a reference for further development and an inspiration for the new way forward.