A color-tunable single-component luminescent molecule with multiple emission centers. Issue 26 (14th June 2021)

• Record Type: Journal Article
• Authors: Chen, Junru; Chen, Xiaojie; Liu, Yanyan; Li, Yang; Zhao, Juan; Yang, Zhiyong; Zhang, Yi; Chi, Zhenguo
• Is Part Of: Chemical science. Volume 12:Issue 26(2021)
• Page Start: 9201
• Page End: 9206
• Publication Date: 2021-06-14
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1sc02094c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Color tunable luminescent materials with multiple emission centers showing delayed fluorescence, single molecular phosphorescence and aggregated molecular phosphorescence are achieved, along with time-dependent and excitation-dependent properties. Abstract : For achieving smart materials with color-tunable emissions, the development of single-component systems exhibiting high durability and stability is desired but remains challenging, in comparison to multicomponent systems. Here, a single-component luminescent molecule (3-SPhF) with colorful emissions is successfully reported through different expressions of triplet excitons in radiative transitions. The time-resolved spectra confirm the existence of delayed fluorescence ( τ = 282.5 μs), monomeric phosphorescence ( τ = 497.7 ms) and aggregated-state phosphorescence ( τ = 230.0 ms) in the crystal powder of 3-SPhF, which affords time-dependent afterglow and excitation-dependent emissions in a steady state. Furthermore, the relationships between ultra-long luminescence and stacking of the dibenzofuran group in single crystals are explored, providing evidence for the regularity of multiple emission centers in single-component compounds with dibenzofuran substituents.