DOI: 10.5061/dryad.7m0cfxq0w
title: Data from: multiexciton interactions in singlet fission and triplet fusion upconversion dendrimers

description: Singlet fission (SF) and triplet-triplet annihilation upconversion
 (TTA-UC) are two multiexciton processes intimately related to the dynamic
 interaction between one high-lying energy singlet and two low-lying energy
 triplet excitons. Here, we introduce a series of dendritic macromolecules
 that serve as a platform to study the effect of interchromophore
 interactions on the dynamics of multiexciton generation and decay as a
 function of dendrimer generation. The dendrimers (generations 1-4) consist
 of trimethylolpropane (TMP) core and 2,2-bis(methylol)propionic acid
 (bis-MPA) dendrons that provide exponential growth of the branches,
 leading to a corona decorated with pentacenes for SF or anthracenes for
 TTA-UC. The findings reveal a trend where a few highly ordered sites
 emerge as the dendrimer generation grows, dominating the multiexciton
 dynamics, as deduced from optical spectra, and transient absorption
 spectroscopy. While the dendritic structures enhance TTA-UC at low
 annihilator concentrations in the largest dendrimers, the paired
 chromophore interactions induce a broadened and red-shifted excimer
 emission. In SF dendrimers of higher generations, the triplet dynamics
 become increasingly dominated by pairwise sites exhibiting strong coupling
 (Type II), which can be readily distinguished from sites with weaker
 coupling (Type I) by their spectral dynamics and decay kinetics.
description: An dendrimer:<br>Normalized absorbance spectra in
 chloroform at 0.03 mg/mL.<br>UCPL data were performed with PdTPTBP
 (50 uM) with corresponding annihilator concentration as shown.
 <br>Pc dendrimer:<br>UV-vis and fluorescence spectra
 were measured using the diluted pentacene dendrimer
 solution.<br>Transient absorption data were collected by Helios and
 EOS excited by 600 nm pulse  Here, fs-TA data are after chirp correction
 and ns-TA are after time zero correction for figures in the
 manuscript. Sensitization measurements were performed
 in toluene solution of anthracene (~10 mM) with low concentrations of
 dendrimers excited by 360 nm pulse. The data here are after time zero
 correction.
description: # Data from: multiexciton interactions in singlet fission and triplet
 fusion upconversion dendrimers *** Model systems designed to investigate
 the multiexciton interactions in dendrimers (G1-G4). Anthracene (An)
 dendrimer is upconversion-active and pentacene (Pc) dendrimer is singlet
 fission-active. UV-vis and fluorescence (including UCPL) of dendrimers
 were used to generate Fig 2 in this manuscript: Raw transient absorption
 data sets using mechanical (fs label) and electronic (ns label) delays.
 Units are picoseconds for time and nm for wavelength. Sensitization data
 (sens label) are taken using the nanosecond configuration. These data were
 used to generate Fig 3 and 4 in this manuscript: ## Description of the
 Data and file structure ### Table of Contents *** * An dendrimer: *
 Anth-dendrimer UCPL raw data.csv * TTA-UC dendrimer absorption
 chloroform.xlsx * Pc dendrimer * UV-vis * G1\_Pc\_tol\_4.txt *
 G2\_Pc\_tol\_4.txt * G3\_Pc\_tol\_4.txt * G4\_Pc\_tol\_4.txt * FL *
 G1\_Pc\_tol\_4.txt * G2\_Pc\_tol\_4.txt *
 G3\_Pc\_tol\_4\_bandwidth\_20nm.txt * G4\_Pc\_tol\_4\_bandwidth\_20nm.txt
 * TA-vis * G1\_Pc\_dendrimer\_fs.csv * G1\_Pc\_dendrimer\_ns.csv *
 G2\_Pc\_dendrimer\_fs.csv * G2\_Pc\_dendrimer\_ns.csv *
 G3\_Pc\_dendrimer\_fs.csv * G3\_Pc\_dendrimer\_ns.csv *
 G4\_Pc\_dendrimer\_fs.csv * G4\_Pc\_dendrimer\_ns.csv * TA-NIR *
 G1\_Pc\_dendrimer\_fs\_NIR.csv * G2\_Pc\_dendrimer\_fs\_NIR.csv *
 G3\_Pc\_dendrimer\_fs\_NIR.csv * G4\_Pc\_dendrimer\_fs\_NIR.csv *
 sensitization * G1\_Pc\_dendrimer\_sens.csv * G2\_Pc\_dendrimer\_sens.csv
 * G3\_Pc\_dendrimer\_sens.csv * G4\_Pc\_dendrimer\_sens.csv File/Folder
 Details === ### Folder Details for: "An dendrimer" Details for:
 Anth-dendrimer UCPL raw data.csv * The UCPL measurements for dendrimers
 and monomer * A1: brief measurement condition * The UCPL are averaged from
 3 repeat measurements: * row 3: labeled the samples * row 4: concentration
 of dendrimers * row 5: v1-v3 are 3 measurements. * Each measurement
 includes two columns: * Wavelength and Intensity Details for: "TTA-UC
 dendrimer absorption chloroform.xlsx" * The absorption spectra of
 dendrimers and monomer * A1: brief measurement condition * row 2: labeled
 the samples * Column 1 is the wavelength and others are corresponding
 absorption spectra. (Note: TIPS-A ester (monomer) is the monomer and
 TIPS-anthracene is a reference here not shown in manuscript) ### Folder
 Details for: "Pc dendrimer" Details for: "UV-vis" and
 "FL" The .txt files include the wavelength and absorption or FL
 intensity. Details for: "TA-vis", "TA-NIR" and
 "sensitization" * All the csv files are the matrix of transient
 spectra data which include: row 1 is the delay time; column 1 is
 wavelength; and the ΔAbs values as function of delay time and wavelength.
 All the fs files are after chirped correction and all ns files are after
 time-zero correction, which are used to make the figures in manuscript. *
 "TA-vis" includes TA measurements in visible region. Delay time
 up to 7 ns for 'fs' labeled files. And delay time up to 200 us
 for 'ns' labeled files. * "TA-NIR" includes TA
 measurements in NIR region. Delay time up to 7 ns for 'fs'
 labeled files. * "sensitization" includes the sensitization TA
 measurement for dendrimers using 10 mM anthracene toluene solution. The
 delay time is up to 200 us.