2023
DOI: 10.1021/acsami.2c18851
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Rational Molecular Design Strategy for High-Efficiency Ultrapure Blue TADF Emitters: Symmetrical and Rigid Sulfur-Bridged Boron-Based Acceptors

Abstract: Developing highly efficient blue thermally activated delayed fluorescence (TADF) emitters with a narrowband emission is still a challenge. Here, novel ultrapure blue TADF emitters of TSBA-Cz and TSBA-PhCz were designed and synthesized for organic light-emitting diodes (OLEDs). Photophysical and time-dependent density functional theory calculation results simultaneously show the similar intramolecular charge-transfer character of MR-type TADF emitters. Benefiting from the symmetrical and rigid molecular configu… Show more

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Cited by 13 publications
(12 citation statements)
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“…130 For TSBA-Cz and TSBA-PhCz , both S 1 and T 1 states were LE-dominant, resulting in substantially similar photophysical properties based on the MR effect. 131 In BSS-Cz , BSS-PA , BSS-SpAc , and BSS-Ac , the HOMO levels of donor units become shallower in the order of Cz < PA < SpAc < Ac. 133 Similar to TSBA-Cz , BSS-Cz showed LE-dominated emission with a narrow FWHM of 28 nm because of the small HOMO offset.…”
Section: Late-stage Functionalisationmentioning
confidence: 97%
See 1 more Smart Citation
“…130 For TSBA-Cz and TSBA-PhCz , both S 1 and T 1 states were LE-dominant, resulting in substantially similar photophysical properties based on the MR effect. 131 In BSS-Cz , BSS-PA , BSS-SpAc , and BSS-Ac , the HOMO levels of donor units become shallower in the order of Cz < PA < SpAc < Ac. 133 Similar to TSBA-Cz , BSS-Cz showed LE-dominated emission with a narrow FWHM of 28 nm because of the small HOMO offset.…”
Section: Late-stage Functionalisationmentioning
confidence: 97%
“…8 and Table 6). 116,120,122–138 The reaction temperature of the first lithium–halogen exchange was kept relatively low (−78 °C to rt), probably to suppress the undesired exchange at the remaining bromine atom. Although the yield of Br-TDBA was relatively low (15%) in Kwon's work, 122 the same product was synthesised later with up to 49% yield, 129 which suggests that lithium–halogen exchange proceeds with high selectivity.…”
Section: One-pot Borylationmentioning
confidence: 99%
“…Recently, more and more researchers have committed to exploring efficient exciplex-based OLEDs and made great progress. For the blue and green emissions, the external quantum efficiencies (EQEs) of some pureorganic exciplex-based devices have approached and exceeded 20%, gradually catching up with the pace of single-molecule TADF OLEDs [5][6][7]. However, the development of pure-organic red exciplex emitters with emission peaks over 600 nm has been almost stagnant.…”
Section: Introductionmentioning
confidence: 99%
“…The delayed lifetime of TADF materials is in the range of hundreds of microseconds as a result of their endothermic RISC process . Most of TADF materials reveal a long delayed fluorescent lifetime, , which leads to enhancement of the triplet-related nonradiative process, such as triplet–triplet annihilate (TTA), triplet-polaron annihilate (TPA), and severe efficiency roll-off at a high current density.…”
Section: Introductionmentioning
confidence: 99%