Turn on of sky-blue thermally activated delayed fluorescence and circularly polarized luminescence (CPL) via increased torsion by a bulky carbazolophane donor

Chemical Science
Nidhi SharmaEli Zysman-Colman

Abstract

The carbazolophane (Czp) donor unit (indolo[2.2]paracyclophane) is introduced to the design pool of donors in thermally activated delayed fluorescence emitters. The increased steric bulk of the annelated donor unit forces an increased torsion between the carbazole and the aryl bridge resulting in a decreased ΔEST and an enhancement of the thermally activated delayed fluorescence in the triazine-containing emitter CzpPhTrz. Further, the closely stacked carbazole and benzene units of the paracyclophane show through-space π-π interactions, effectively increasing the spatial occupation for the HOMO orbital. The chiroptical properties of enantiomers of [2.2]paracyclophane reveal mirror image circular dichroism (CD) and circularly polarized luminescence (CPL) with glum of 1.3 × 10-3. rac-CzpPhTrz is a sky-blue emitter with λPL of 480 nm, a very small ΔEST of 0.16 eV and high ΦPL of 70% in 10 wt% doped DPEPO films. Sky blue-emitting OLEDs were fabricated with this new TADF emitter showing a high maximum EQE of 17% with CIE coordinates of (0.17, 0.25). A moderate EQE roll-off was also observed with an EQE of 12% at a display relevant luminance of 100 cd m-2. Our results show that the Czp donor contributes to both a decreased ΔEST and a...Continue Reading

References

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Citations

Apr 2, 2020·Organic & Biomolecular Chemistry·Masahiro KuboKoji Nakano
Aug 28, 2020·Frontiers in Chemistry·Francesco RodellaPeter Strohriegl
Jan 31, 2020·Chemical Society Reviews·Da-Wei ZhangChuan-Feng Chen
Jan 19, 2021·Advanced Materials·Gloria HongStefan Bräse
Jan 26, 2021·Frontiers in Chemistry·Simonas KrotkusIfor D W Samuel
May 19, 2021·Chemical Society Reviews·Megan Amy Bryden, Eli Zysman-Colman
Aug 6, 2021·Chemical Science·Amrutha PrabodhFrank Biedermann
Jul 22, 2021·Chemistry : a European Journal·Rong-Huei YiChin-Wei Lu
Jan 6, 2021·The Journal of Physical Chemistry Letters·Hiromu KuboKenji Matsuda
Oct 2, 2021·Advanced Materials·Sheng-Yi YangShuit-Tong Lee

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Methods Mentioned

BETA
Fluorescence
circular dichroism
NMR
X-ray
differential scanning calorimetry

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