Abstract
Circularly polarized organic afterglow (CPOA) with both long-lived room-temperature phosphorescence (RTP) and circularly polarized luminescence (CPL) is currently attracting great interest, but the development of multicolor-tunable CPOA in a single-component material remains a formidable challenge. Here, we report an efficient strategy to achieve multicolor CPOA molecules through chiral clusterization by implanting chirality center into non-conjugated organic cluster. Owing to excitation-dependent emission of clusters, highly efficient and significantly tuned CPOA emissions from blue to yellowish-green with dissymmetry factor over 2.3 × 10−3 and lifetime up to 587 ms are observed under different excitation wavelengths. With the distinguished color-tunable CPOA, the multicolor CPL displays and visual RTP detection of ultraviolent light wavelength are successfully constructed. These results not only provide a new paradigm for realization of multicolor-tunable CPOA materials in single-component molecular systems, but also offer new opportunities for expanding the applicability of CPL and RTP materials for diversified applications.
Highlights
Polarized organic afterglow (CPOA) with both long-lived room-temperature phosphorescence (RTP) and circularly polarized luminescence (CPL) is currently attracting great interest, but the development of multicolor-tunable Circularly polarized organic afterglow (CPOA) in a single-component material remains a formidable challenge
Polarized organic afterglow (CPOA) with both the ultralong-lived triplet excited state for room-temperature phosphorescence (RTP) and efficient CPL features is an amazing type of luminance that has emerged as a hot research topic recently because of the distinguished photophysical phenomena in various remarkable applications[17,18,19,20]
As a proof of concept, with the molecular design strategy, the enantiomers of (R, R)-DAACH, and (S, S)DAACH were facilely synthesized by a one-step amidation reaction between trans-(1 R, 2 R)/(1 S, 2 S)-diamidocyclohexane and succinic anhydride. This one-step reaction enables high yields up to 88% and the resultant molecules were systematically characterized by nuclear magnetic resonance (NMR) spectra, high-resolution mass spectra (HRMS), matrix-assisted laser desorption/ionization time of flight mass spectrometer (MALDITOF MS) and thermal physical properties (Supplementary Figs. 1–13)
Summary
Polarized organic afterglow (CPOA) with both long-lived room-temperature phosphorescence (RTP) and circularly polarized luminescence (CPL) is currently attracting great interest, but the development of multicolor-tunable CPOA in a single-component material remains a formidable challenge. The pleochroism of chiral luminescent materials can empower multiplexing confidentiality for multilevel data encoding and encryption[7]; the multicolor CPL materials with stimuli-response attributes are idea emissive mediums for brilliant liquid crystal and stereoscopic display[8]; high sensitivity and spatial resolution luminescence sensors for biological analytes and object identification could be gifted by employing polychromatic chiral molecules as optical marker recognition[9] In these applications, multicolor-tunable CPL emissions are highly desired, but can be only realized in multicomponent material systems on the basis of various design methods including multicomponent supramolecular assembly[10,11], chemical additive induced excited state modulation[12,13,14] and solvation effect enabled structural color change[15], etc. These findings in purposefully constructing multicolor CPOA with the on-demand color-tuning ability through the elaborate molecular design by chiral clusterization would provide a promising platform for the exploration of single-component smart CPL and RTP materials
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