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Journal article
Benzimidazole-substituted bisanthracene: a highly efficient deep-blue triplet–triplet fusion OLED emitter at low dopant concentration
Materials today chemistry, Vol.26, 101185
12/01/2022
Web of Science ID: WOS:000867873400002
Abstract
Two anthracene derivatives, MAnBz and DiAnBz, have been developed as emitters for deep-blue triplet–triplet fusion (TTF) fluorescence organic light emitting diodes (OLEDs). DiAnBz bearing two anthracene units at a closed distance, separated by one phenylene moiety, shows high photoluminescent quantum yields and deep-blue emission. The remarkable maximum external quantum efficiency (EQEmax) of 6.7% and 8.3% are obtained from DiAnBz-OLEDs with pristine prompt fluorescence and TTF fluorescence models, respectively. In particular, effectively diffusive TTF characteristics still can be detected at DiAnBz-OLED with an extreme low emitter concentration of 1 wt%, whose device performance exhibited a high EQEmax of 7.0% with deep blue emission at CIE (0.148, 0.078). The diffusive TTF characteristics with 20 times shorter delayed emission lifetime (τ2 of 3–4 μs), in comparison with that of MAnBz (τ2 of 60–70 μs) in the time-resolved electroluminescence experiments. This implies that pairing and TTF of the DiAnBz triplet excitons are more effective than that of MAnBz in the light emitting layer.
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•Two new anthracene-based triplet–triplet fusion (TTF) emitters MAnBz and DiAnBz were developed.•MAnBz and DiAnBz possess a high photoluminescence quantum yield closed to 90%.•DiAnBz single-emitting layer organic light emitting diode showed the prompt fluorescent emission with maximum external quantum efficiency (EQEmax) of 6.7%.•DiAnBz TTF-organic light emitting diode achieved a high EQEmax of 8.3% with Commission International de L'Eclairge coordinates (0.145, 0.110).•DiAnBz also showed the effectively diffusive TTF mechanism at an extreme low dopant concentration case.
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Details
- Title
- Benzimidazole-substituted bisanthracene
- Publication Details
- Materials today chemistry, Vol.26, 101185
- Resource Type
- Journal article
- Publisher
- Elsevier Ltd
- Number of pages
- 10
- Grant note
- Tetrahedron Technology"Advanced Research Centre of Green Materials Science and Technology" from The Featured Area Research Centre Program within Ministry of Education, Taiwan: MOE 108L9006 European Union: 823720 National Science and Technology Council, Taiwan: MOST 1112221-E-155-013, 111-2923-E-155-002-MY3, 110-2634-F-002-043, 110-2811-M-001-523, 110-2622-E-155-010, 110-2113-M-002-009 The National Science and Technology Council, Taiwan: 109-2622-E-155-014, 109-2221-E-011-150, 108-3017-F-002-002, 108-2113-M-001-028-MY3, 107-2113-M-002-020 MY3, 108-2221E-155-051-MY3, 108-2912-I-155-504, 108-2811-E-155-504-MY3, 107-2221-E-155-058-MY3, 107-2221-E-002-156-MY3, 108-2113M-002-022-MY3
This workwas financially supported by Tetrahedron Technology, the "Advanced Research Centre of Green Materials Science and Technology" from The Featured Area Research Centre Program within the framework of the Higher Education Sprout Project by the Ministry of Education, Taiwan: MOE 108L9006; The MEGA project, which has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 823720; National Science and Technology Council, Taiwan under Grant numbers: MOST 1112221-E-155-013; 111-2923-E-155-002-MY3; 110-2634-F-002-043; 110-2811-M-001-523; 110-2622-E-155-010; 110-2113-M-002-009; 109-2622-E-155-014; 109-2221-E-011-150; 108-3017-F-002-002; 108-2113-M-001-028-MY3; 107-2113-M-002-020 MY3; 108-2221E-155-051-MY3, 108-2912-I-155-504, 108-2811-E-155-504-MY3, 107-2221-E-155-058-MY3, 107-2221-E-002-156-MY3, 108-2113M-002-022-MY3.
- Copyright
- © 2022 Elsevier Ltd. All rights reserved.
- Identifiers
- WOS:000867873400002; 99381548017806600
- Academic Unit
- Chemistry; Hal Marcus College of Science and Engineering
- Language
- English