Published March 2022 | Version v1
Journal article Metadata-only

Highly twisted α-diketone-based thermally activated delayed fluorescence emitters and their use in organic light-emitting diodes

Creators

  • 1. University of St Andrews, SUPA School of Physics and Astronomy, Organic Semiconductor Centre, Fife (United Kingdom)
  • 2. University of St Andrews, Organic Semiconductor Centre, EaStCHEM School of Chemistry, Fife (United Kingdom)
  • 3. University of St Andrews, EaStCHEM School of Chemistry, Organic Semiconductor Centre, Fife (United Kingdom)

Description

We have designed a highly twisted small thermally activated delayed fluorescence (TADF) emitter PXZ-α-DK based on an α-diketone (α-DK) as a strong acceptor and phenoxazine (PXZ) as a strong donor to obtain red-shifted emission in comparison with the equivalent α-diketone linked to 9,9-dimethyl-9,10-dihydroacridine (DMAC). The PXZ-α-DK shows emission at 586 nm and DMAC-α-DK shows emission at 548 nm in 1,3-bis(N-carbazolyl)benzene (mCP) host at 1.5 wt% doping of the emitter, with short-delayed lifetimes of 6.9 μs for PXZ-α-DK and 7.6 μs for DMAC-α-DK. Organic light-emitting diodes (OLEDs) fabricated using these emitters show green electroluminescence at 555 nm for DMAC-α-DK, with a maximum external quantum efficiency, EQEmax, of 6.3%, and orange electroluminescence at 585 nm for PXZ-α-DK, with an EQEmax of 0.8%. We corroborate the optoelectronic properties of these emitters with DFT calculations. (author)

Availability note (English)

Available from DOI: https://doi.org/10.1139/cjc-2021-0208

Additional details

Identifiers

DOI
10.1139/cjc-2021-0208;

Publishing Information

Journal Title
Canadian Journal of Chemistry
Journal Volume
100
Journal Issue
3
Journal Page Range
p. 224-233
ISSN
0008-4042

INIS

Country of Publication
Canada
Country of Input or Organization
Canada
INIS RN
54030352
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
2-3-PENTANEDIONE; BINDING ENERGY; FLUORESCENCE; LIGHT EMITTING DIODES; ORGANIC COMPOUNDS; RADICALS
Descriptors DEC
EMISSION; ENERGY; KETONES; LUMINESCENCE; ORGANIC COMPOUNDS; PHOTON EMISSION; SEMICONDUCTOR DEVICES; SEMICONDUCTOR DIODES

Optional Information

Notes
20 refs., 3 tabs., 9 figs.