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Currently, purely organic compounds showing ambient phosphorescence with high efficiency (ΦP) and ultra‐long lifetime (τP) are quite rare and often need to be achieved in hydrophilic poly(vinyl alcohol)‐based hosts. This severely limits their applications. Here, we provide a solution to this issue by constructing an ortho‐linked donor‐acceptor (D−A) dyad whose D moiety has not only a long‐lived T1 state to achieve a long τP, but also a Tn state that is close to the S1 state of the dyad to trigger effective spin‐orbit charge transfer intersystem crossing (SOCT‐ISC). The rationality of this strategy was validated by a new phosphor OF‐BCz that is able to show a τP of 1.92 s and a ΦP of 30 % even in a less rigid matrix of poly(methyl methacrylate) (PMMA). Excitingly, OF‐BCz exhibited its potential as both a photocuring initiator and an in situ quality indicator, allowing for the visual detection of defects in photolithographic patterning. [ABSTRACT FROM AUTHOR]

Although long‐lived triplet charge‐transfer (3CT) state with high energy level has gained significant attention, the development of organic small molecules capable of achieving such states remains a major challenge. Herein, by using the through‐space electronic coupling effect, we have developed a compound, namely NIC‐DMAC, which has a long‐lived 3CT state at the single‐molecule level with a lifetime of 210 ms and a high energy level of up to 2.50 eV. Through a combination of experimental and computational approaches, we have elucidated the photophysical processes of NIC‐DMAC, which involve sequential transitions from the first singlet excited state (S1) that shows a 1CT character to the first triplet excited state (T1) that exhibits a local excited state feature (3LE), and then to the second triplet excited state (T2) that shows a 3CT character (i.e. S1 (1CT)→T1 (3LE)→T2 (3CT)). The long lifetime and high energy level of its 3CT state have enabled NIC‐DMAC as an initiator for photocuring in double patterning applications. [ABSTRACT FROM AUTHOR]

Keywords: Ambient Phosphorescence; Defect Indicator; High Efficiency; Long Lifetime; PhotolithographyPhosphorescent Materials. In ther Communication (e202312534), Yan Huang, Zhiyun Lu et al. report the construction of a new ortho‐linked donor–acceptor dyad showing a long lifetime and a high efficiency up to 30 % in PMMA matrix...By Ruyi Liu; Chuanhao Liu; Caixia Fu; Zhenzhen Zhu; Kuan Chen; Chuan Li; Lingjie Wang; Yan Huang and Zhiyun LuReported by Author; Author; Author; Author; Author; Author; Author; Author; Author [Extracted from the article]