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Improved quantum yield of thermally activated delayed fluorescence by nanoconfinement in organophilic octosilicate
Abstract A hybrid of a thermally activated delayed fluorescent dye (1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene, designated as 4CzIPN) and an organophilic layered silicate (dioleyldimethylammonium-octosilicate) was synthesized to achieve high photoluminescence quantum yield (0.71) of the dye, which is the critical factor in device application. Absorption, photoexcitation, and luminescence spectra suggested that the molecular conformation of 4CzIPN in the organophilic silicate enabled the utilization of the S0 → S1 transition efficiently. Furthermore, thanks to the flexible assembly of the dioleyldimethylammonium moieties, 4CzIPN was dispersed in the hybrid to suppress concentration quenching. Emission spectra and photoluminescence lifetimes in ambient and N2 atmosphere revealed that the photoluminescence quantum yield increased by the utilization of transition to a lower vibrational state and protection of a triplet state of 4CzIPN from oxygen in air in the organophilic silicate.
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Highlights A thermally activated delayed fluorescence dye was intercalated to organophilic octosilicate. The dye, 4CzIPN, in octosilicate showed similar absorption and emission spectra to its powder. Photoluminescence quantum yield (PLQY) of 4CzIPN in octosilicate was higher than that of its powder. Effective dispersion and protection of 4CzIPN from O2 in octosilicate increased the PLQY.
Improved quantum yield of thermally activated delayed fluorescence by nanoconfinement in organophilic octosilicate
Abstract A hybrid of a thermally activated delayed fluorescent dye (1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene, designated as 4CzIPN) and an organophilic layered silicate (dioleyldimethylammonium-octosilicate) was synthesized to achieve high photoluminescence quantum yield (0.71) of the dye, which is the critical factor in device application. Absorption, photoexcitation, and luminescence spectra suggested that the molecular conformation of 4CzIPN in the organophilic silicate enabled the utilization of the S0 → S1 transition efficiently. Furthermore, thanks to the flexible assembly of the dioleyldimethylammonium moieties, 4CzIPN was dispersed in the hybrid to suppress concentration quenching. Emission spectra and photoluminescence lifetimes in ambient and N2 atmosphere revealed that the photoluminescence quantum yield increased by the utilization of transition to a lower vibrational state and protection of a triplet state of 4CzIPN from oxygen in air in the organophilic silicate.
Graphical abstract Display Omitted
Highlights A thermally activated delayed fluorescence dye was intercalated to organophilic octosilicate. The dye, 4CzIPN, in octosilicate showed similar absorption and emission spectra to its powder. Photoluminescence quantum yield (PLQY) of 4CzIPN in octosilicate was higher than that of its powder. Effective dispersion and protection of 4CzIPN from O2 in octosilicate increased the PLQY.
Improved quantum yield of thermally activated delayed fluorescence by nanoconfinement in organophilic octosilicate
Yamaguchi, Tetsuo (author) / Imwiset, Kamonnart Jaa (author) / Choi, Min Gyeong (author) / Oh, Jae-Min (author) / Lee, Sae Youn (author) / Ogawa, Makoto (author)
Applied Clay Science ; 236
2023-02-22
Article (Journal)
Electronic Resource
English
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