Meta-Pyridyl Substitution for New Blue Host Materials with Enhanced Thermal Stability and Electron-Injection Properties
- 1Integrated Engineering, Department of Chemical Engineering, Kyung Hee University, Yongin-si 17104, Gyeonggi-do, Republic of Korea
Abstract
Two new host materials, 3-(3-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)phenyl)pyridine (TDBA-Py) and 3,3′-(5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-1,3-phenylene)dipyridine (TDBA-dPy), were designed and synthesized by introducing one pyridine unit at the meta position and two pyridine units at the 3,5-positions, respectively, of the terminal phenyl ring of the TDBA core, a 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA)-based multiple-resonance framework, and the resulting changes in their properties were analyzed. By controlling the number of pyridine substituents at the meta positions of a single phenyl ring, the extension of intramolecular conjugation was suppressed, which maintained a high triplet energy (T1 ≥ 2.76 eV) and the emission wavelength and simultaneously improved the electron-injection properties. In the devices employing ν-DABNA as the dopant, the TDBA-Py-based device exhibited a low turn-on voltage of 2.5 V, a maximum power efficiency (PEmax) of 10.9 lm W−1, and a maximum current efficiency (CEmax) of 12.5 cd A−1, which can be attributed to its lowered lowest unoccupied molecular orbital (LUMO) level. These results demonstrate that introducing appropriate electron-accepting character through single pyridine substitution is an effective host-design strategy for improving device efficiency.
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BibTeX
@article{han2026metapyridyl,
title = {{Meta-Pyridyl Substitution for New Blue Host Materials with Enhanced Thermal Stability and Electron-Injection Properties}},
author = {Jeongmin Han and Sangwook Park and Saeyoung Oh and Hyeonho Park and Kiho Lee and Hayoon Lee and Jongwook Park},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31203768},
url = {https://www.mdpi.com/1420-3049/31/20/3768},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Meta-Pyridyl Substitution for New Blue Host Materials with Enhanced Thermal Stability and Electron-Injection Properties
AU - Jeongmin Han
AU - Sangwook Park
AU - Saeyoung Oh
AU - Hyeonho Park
AU - Kiho Lee
AU - Hayoon Lee
AU - Jongwook Park
PY - 2026
DA - 2026/10/20
JO - Molecules
DO - 10.3390/molecules31203768
UR - https://www.mdpi.com/1420-3049/31/20/3768
AB - Two new host materials, 3-(3-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)phenyl)pyridine (TDBA-Py) and 3,3′-(5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-1,3-phenylene)dipyridine (TDBA-dPy), were designed and synthesized by introducing one pyridine unit at the meta position and two pyridine units at the 3,5-positions, respectively, of the terminal phenyl ring of the TDBA core, a 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA)-based multiple-resonance framework, and the resulting changes in their properties were analyzed. By controlling the number of pyridine substituents at the meta positions of a single phenyl ring, the extension of intramolecular conjugation was suppressed, which maintained a high triplet energy (T1 ≥ 2.76 eV) and the emission wavelength and simultaneously improved the electron-injection properties. In the devices employing ν-DABNA as the dopant, the TDBA-Py-based device exhibited a low turn-on voltage of 2.5 V, a maximum power efficiency (PEmax) of 10.9 lm W−1, and a maximum current efficiency (CEmax) of 12.5 cd A−1, which can be attributed to its lowered lowest unoccupied molecular orbital (LUMO) level. These results demonstrate that introducing appropriate electron-accepting character through single pyridine substitution is an effective host-design strategy for improving device efficiency.
SN - 1420-3049
ER -