The Triplet–Triplet Annihilation Efficiency of Some 9,10-Substituted Diphenyl Anthracene Variants : A Decisive Analysis from Kinetic Rate Constants
department or school: TRIUMF
department or school: Non UBC
data provider: DSpace
identifier citation: Optics 6 (1): 8 (2025)
creator: Lindgren, Mikael
creator: Bjelland, Victoria M.
creator: Melø, Thor-Bernt
creator: McCracken, Callum
creator: Seo, Satoshi
creator: Nakashima, Harue
issued: 2025-05-05T16:01:19Z
issued: 2025-03-12
description: Triplet–triplet transfer photochemical reactions are essential in many biological, chemical, and photonic applications. Here, the Pd-octaethylporphyrin sensitizer along with triplet–triplet annihilator (TTA) active 9,10-diphenylantracenes (DPA) and the related substituted variants in low concentrations were examined. A full experimental approach is presented for finding the necessary rate parameters with statistical standard deviation parameters. This was achieved by solving the pertinent non-analytical kinetic differential equation and fitting it to the experimental time-resolved photoluminescence of both slow fluorescence and sensitizer phosphorescence. The efficiency of the triplet–triplet energy transfer rate was found to be around 90% in THF but only around 75% in toluene. This appears to follow from the shorter lifetime of the sensitizer triplet in toluene. Moreover, the TTA transfer rate was on average more than 40% in THF toluene whereas a considerably lower value around 20–30% was found for toluene. This originated in an order of magnitude higher solvent quenching rate using toluene, based on the analysis of the delayed fluorescence decay traces. These are also higher than the statistically expected 1/9 TTA efficiency but in accordance with recent results in the literature, that attributed these high values to an inverse intersystem crossing process. In addition, quantum chemical calculations were carried out to reveal the pertinent excited triplet molecular orbitals of the lowest triplet excited state for a series of substituted DPAs, in comparison with the singlet ground state. Conclusively, these states distribute mainly in an anthracene ring in all compounds being in the range 1.64–1.65 eV above the ground state. The TTA efficiency was found to vary depending on the DPA annihilator substitution scheme and found to be smaller in THF. This is likely because the molecular framework over which the T1 excited molecular orbitals distribute is less sensitive f…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/90994
note: Academic Editor: Marco GandolfiReceived: 30 December 2024Revised: 4 March 2025Accepted: 7 March 2025Published: 12 March 2025Citation: Lindgren, M.; Bjelland,V.M.; Melø, T.-B.; McCracken, C.; Seo,S.; Nakashima, H. The Triplet–TripletAnnihilation Efficiency of Some9,10-Substituted Diphenyl AnthraceneVariants—A Decisive Analysis fromKinetic Rate Constants. Optics 2025, 6,8. https://doi.org/10.3390/opt6010008Copyright: © 2025 by the authors.Licensee MDPI, Basel, Switzerland.This article is an open access articledistributed under the terms andconditions of the Creative CommonsAttribution (CC BY) license(https://creativecommons.org/licenses/by/4.0/).ArticleThe Triplet–Triplet Annihilation Efficiency of Some9,10-Substituted Diphenyl Anthracene Variants—A DecisiveAnalysis from Kinetic Rate ConstantsMikael Lindgren 1,* , Victoria M. Bjelland 1, Thor-Bernt Melø 1 , Callum McCracken 2 , Satoshi Seo 3and Harue Nakashima 31 Department of Physics, Faculty of Natural Sciences, Norwegian University of Science andTechnology (NTNU), Gløshaugen, Realfagbygget, NO-7491 Trondheim, Norway;victoria.m.bjelland@ntnu.no (V.M.B.)2 TRIUMF, The University of British Columbia, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada;cmccracken@triumf.ca3 Semiconductor Energy Laboratory Co., Ltd., 398 Hase, Atsugi-Shi 243-0036, Kanagawa, Japan;nakasima@sel.co.jp (H.N.)* Correspondence: mikael.lindgren@ntnu.no; Tel.: +47-41466510Abstract: Triplet–triplet transfer photochemical reactions are essential in many biological,chemical, and photonic applications. Here, the Pd-octaethylporphyrin sensitizer alongwith triplet–triplet annihilator (TTA) active 9,10-diphenylantracenes (DPA) and the relatedsubstituted variants in low concentrations were examined. A full experimental approachis presented for finding the necessary rate parameters with statistical standard deviationparameters. This was achieved by solving the pertinent non-analytical kinetic differentialequation and fitting it to the experimental time-res…
has type: Article
is shown at: 10.14288/1.0448748
language: eng
peer review status: Reviewed
provider: Vancouver : University of British Columbia Library
publisher: Multidisciplinary Digital Publishing Institute
publisher DOI: 10.3390/opt6010008
rights: CC BY 4.0
rights URI: https://creativecommons.org/licenses/by/4.0/
scholar level: Faculty
scholar level: Researcher
subject: triplet–triplet annihilation (TTA)
subject: TTA kinetics
subject: TTA upconversion
subject: triplet energy transfer
subject: blue OLED materials
subject: 9,10-diphenylanthracene
subject: triplet state calculations
type: Text
identifier URI: http://hdl.handle.net/2429/90994