Excited state dynamics of intramolecular charge transfer excited state in thermally activated delayed fluorescence carbazole dendrimer

27 May 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Organic light-emitting diodes (OLEDs) using dendrimers as emitting layers are gathering attention due to their ability of precise molecular structuring. Carbazole dendrimers have been utilized in luminescent devices demonstrating thermally activated delayed fluorescence (TADF), which efficiently converts non-emissive triplet states to emissive singlet states, enhancing OLED performance. Our research examined triazine-cored carbazole TADF dendrimers with three generations, assessing their photofunctional properties through time-resolved photoluminescence and transient absorption spectroscopy. We revealed significant generation-dependent charge-transfer characteristics, with higher generations showing enhanced charge-transfer character in the singlet excited state. On the contrary, while the transient absorption spectra of the singlet excited state were modified sensitively by elongation of the dendron, those of the triplet excited state were insensitive to the generation. This study underscores the importance of molecular design in dendrimers for optimizing electronic properties, providing insights into their unique photophysical behaviors, and potentially guiding future developments in OLED technology.


Thermally activated delayed fluorescence
Ultrafast spectroscopy
Dendrimer materials

Supplementary materials

Supporting Information
Supporting information


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.