Organic ultralong room-temperature phosphorescence (RTP) usually emerges instantly and immediately decays after excitation removal. Here we report a new delayed RTP that is postponed by dozens of milliseconds after excitation removal and decays in two steps including an initial increase in intensity followed by subsequent decrease in intensity. The delayed RTP is achieved through introduction of phosphines into carbazole emitters. In contrast to the rapid energy transfer from single-molecular triplet states (T) to stabilized triplet states (T*) of instant RTP systems, phosphine groups insert their intermediate states (T) between carbazole-originated T and T* of carbazole-phosphine hybrids. In addition to markedly increasing emission lifetimes by ten folds, since T → T* transition require >30 milliseconds, RTP is thereby postponed by dozens of milliseconds. The emission character of carbazole-phosphine hybrids can be used to reveal information through combining instant and delayed RTP, realizing multi-level time resolution for advanced information, biological and optoelectronic applications.
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http://dx.doi.org/10.1038/s41467-024-47888-z | DOI Listing |
Methods Appl Fluoresc
December 2024
Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX, 76129, United States of America.
Chem Sci
November 2024
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 P. R. China
Unlike boron, nitrogen-containing multi-resonance emitters with thermally activated delayed fluorescence, here we report boron, sulfur (B, S)-based multi-resonance emitters with room-temperature phosphorescence (RTP) by inserting thiophene into a 5,9-dithia-13-boranaphtho[3,2,1-]anthracene skeleton that simultaneously realizes large singlet-triplet energy splitting and strong spin-orbital coupling, leading to efficient room-temperature phosphorescence in an amorphous state. Unlike most RTP emitters with ultraviolet excitation, the multi-resonance RTP emitters exhibit strong phosphorescence under daily-use blue/white LED lamps owing to their intense absorption in the visible-light region (400-486 nm). Meanwhile, such RTP behavior can be tuned by the number and fusing pattern of the thiophene moieties, with the emitters containing thiophene linked to boron atoms α-positions exhibiting bathochromatically shifted emissions and longer phosphorescence lifetimes (47.
View Article and Find Full Text PDFACS Mater Au
November 2024
Kaunas University of Technology, Baršausko 59, Kaunas 51423, Lithuania.
To enhance the usually low-charge carrier mobilities of highly twisted donor-acceptor-type compounds that exhibit thermally activated delayed fluorescence, we designed a rodlike acceptor benzodioxinoquinoxaline. This acceptor and two donor-acceptor-donor derivatives were synthesized via microwave Buchwald-Hartwig cross-coupling reactions with yields of up to 91%. The compounds exhibit three different types of photoluminescence, which is well-explained by quantum chemical calculations.
View Article and Find Full Text PDFJ Exp Zool A Ecol Integr Physiol
November 2024
School of the Environment, The University of Queensland, St Lucia, Queensland, Australia.
Spectrochim Acta A Mol Biomol Spectrosc
February 2025
Hebei Key Laboratory of Inorganic Nanomaterials, College of Chemistry and Material Science, Hebei Normal University, No. 20Rd. East of 2nd Ring South, Yuhua District, Shijiazhuang, Hebei 050024, PR China. Electronic address:
The selective detection of acrylamide (AA) is crucial, which is limited by the high background and interferences from food matrix. A room temperature phosphorescence (RTP) assay was developed through modulating its RTP by a stepwise rigidification strategy. The first step rigidification resulted in crosslinking of AA and denser of hydrogen bonding.
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