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Journal article
Modification of thermally activated delayed fluorescence emitters comprising acridan-pyrimidine moieties for efficient sky-blue to greenish-blue OLEDs
Journal of materials chemistry. C, Materials for optical and electronic devices, Vol.11(41), pp.14395-14403
10/26/2023
Web of Science ID: WOS:001078923700001
Abstract
Thermally activated delayed fluorescence (TADF) is a promising approach to harvest triplet excitons and achieve high-performance organic light-emitting diodes (OLEDs) for displays. In this study, we synthesized two new TADF emitters, 4Ac25CzPy and 4Ac35CzPy, featuring acridan-pyrimidine-carbazole moieties. Remarkably, a slight modification in the carbazole group position enables precise control of luminous color, resulting in emissions at 483 nm and 494 nm for 4Ac25CzPy and 4Ac35CzPy, respectively, in the electroluminescent device. Both compounds exhibit small energy difference between their singlet and triplet states (Delta EST) of 0.14 eV and 0.15 eV, confirming their TADF characteristics. Notably, OLEDs utilizing 4Ac35CzPy achieve outstanding performance with the maximum external quantum efficiency (eta EQE) of 21.2% and a photoluminescence quantum yield of 65.1%. This high efficiency is attributed to efficient energy transfer from the host to the emitter. Moreover, the 4Ac35CzPy device exhibits a high light outcoupling efficiency of 0.3, further enhancing its remarkable performance.
Thermally activated delayed fluorescence (TADF) is a promising approach to harvest triplet excitons and achieve high-performance organic light-emitting diodes (OLEDs) for displays.
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Details
- Title
- Modification of thermally activated delayed fluorescence emitters comprising acridan-pyrimidine moieties for efficient sky-blue to greenish-blue OLEDs
- Publication Details
- Journal of materials chemistry. C, Materials for optical and electronic devices, Vol.11(41), pp.14395-14403
- Resource Type
- Journal article
- Publisher
- Royal Society of Chemistry
- Number of pages
- 9
- Grant note
- This work was supported by the National Science and Technology Council (NSTC), Taiwan, under grants NSTC 112-2221-E-002-216-MY3, 112-2221-E-155-028-MY3, 112-2113-M-002-001, 111-2222-E-259-001-MY3, 111-2113-M-002-023, 111-2634-F-002-016, 111-2221-E-155-013,
This work was supported by the National Science and Technology Council (NSTC), Taiwan, under grants NSTC 112-2221-E-002-216-MY3, 112-2221-E-155-028-MY3, 112-2113-M-002-001, 111-2222-E-259-001-MY3, 111-2113-M-002-023, 111-2634-F-002-016, 111-2221-E-155-013, 111-2923-E-155-002-MY3, 110-2113-M-002-009, 110-2622-E-155-010, 110-2222-E-002-003-MY3, 109-2622-E-155-014, 108-2221-E-155-051-MY3, 108-2811-E-155-504-MY3; Ministry of Education (MOE) 111L9006; the MEGA project, which has received funding from the European Union & apos;s Horizon 2020 research and innovation programme under the Marie Sk & lstrok;odowska-Curie grant agreement no. 823720.
- Identifiers
- WOS:001078923700001; 99381548017106600
- Academic Unit
- Chemistry; Hal Marcus College of Science and Engineering
- Language
- English