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Isomer design unlocks rainbow phosphorescence

Xinyue XuSchool of Materials Science and Engineering, Ocean University of China, Qingdao, ChinaDong DingSchool of Materials Science and Engineering, Ocean University of China, Qingdao, ChinaXinyu DingSchool of Materials Science and Engineering, Ocean University of China, Qingdao, ChinaShaoyang HanSchool of Materials Science and Engineering, Ocean University of China, Qingdao, ChinaErkin ZakhidovInstitute of Ion-Plasma and Laser Technologies of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanFeng LiAnalytical and Testing Center, Qingdao University of Science & Technology, Qingdao, China. [email protected]Mingliang SunSchool of Materials Science and Engineering, Ocean University of China, Qingdao, China. [email protected]

Nature Communicationsjournal2026en

ABI

Annotatsiya

Achieving predictable color-tunable organic room-temperature phosphorescence (RTP) remains challenging due to limited understanding of triplet-state regulation in heteroaromatic systems. Carbazole and benzindole isomers provide an ideal platform to clarify how nitrogen positional isomerism governs triplet exciton behavior and emission energetics. Here, we establish a unified comparative framework to systematically investigate carbazole together with Bd[f], Bd[e], and Bd[g]. Nitrogen-site modulation within the fused tricyclic skeleton generates distinct red, yellow, green, and blue phosphorescence, while mechanochemical solvent-free synthesis enables scalable preparation of previously inaccessible benzindole isomers. Photophysical measurements combined with DFT/TD-DFT calculations, single-crystal analysis, and interaction region indicator theory reveal that positional isomerism controls exciton localization, triplet stabilization, and nonradiative decay independent of the host matrix. Here, we show that isomer-regulated triplet dynamics enable full-spectrum RTP, ultralong lifetimes up to 4.23 s, TSFRET behavior, and matrix-universal multifunctionality, establishing a general molecular design principle for rainbow-like organic phosphorescent materials.

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Mavzular

Luminescence and Fluorescent Materials Organic Light-Emitting Diodes Research Luminescence Properties of Advanced Materials

Identifikatorlar

DOI: 10.1038/s41467-026-70784-7

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