Novel blue multiresonance thermally activated delayed fluorescence host materials, including Ge-based bulky groupsopen access
- Authors
- Park, Sangwook; Kwon, Hyukmin; Lee, Hayoon; Lee, Kiho; Kang, Seokwoo; Kim, Ki Ju; Kim, Taekyung; Park, Jongwook
- Issue Date
- 21-Mar-2024
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.12, no.12, pp 4384 - 4391
- Pages
- 8
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 12
- Number
- 12
- Start Page
- 4384
- End Page
- 4391
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/33025
- DOI
- 10.1039/d4tc00288a
- ISSN
- 2050-7526
2050-7534
- Abstract
- We synthesized three materials, namely, TDBA-Ge, mTDBA-Ge, and mTDBA-2Ge, as blue host emitters. These materials incorporate a tetraphenylgermanium (TPG) group with a germanium atom into the main backbone of 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA), demonstrating multiple-resonance-induced thermally activated delayed fluorescence (MR-TADF). All three materials exhibited high thermal stability with a glass transition temperature (Tg) exceeding 100 degrees C. The increased molecular distance also demonstrated the inhibition of self-quenching between molecules in the packing. All three materials showed Delta EST values within 0.3 eV, confirming their potential for MR-TADF characteristics. Especially, mTDBA-2Ge exhibited the lowest Delta EST value of 0.11 eV among the three materials. When these host materials were doped with the conventional dopant nu-DABNA, efficient energy transfer between the two materials was observed, and the resulting device efficiency was confirmed. In comparison to TDBA-Ph, which lacks the TPG moiety and contains only phenyl groups, an approximately 1.5-1.8-fold increase in external quantum efficiency max (EQEmax) was observed. Among the three materials, mTDBA-2Ge exhibited the highest efficiency, with an EQEmax of 24.41%. We synthesized three materials, namely, TDBA-Ge, mTDBA-Ge, and mTDBA-2Ge, as blue host emitters. Among the three materials, mTDBA-2Ge exhibited the highest efficiency, with an EQEmax of 24.41%.
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Collections - College of Science and Technology > School of Materials Science and Engineering > 1. Journal Articles
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