Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 21, Pages 6265-6271Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm503102d
Keywords
-
Funding
- PRESTO from the Japan Science and Technology Agency (JST) [23685020]
- Ministry of Education, Culture, Sports, Science & Technology in Japan (MEXT) [26288095]
- NEXT Program from the Japan Society for the Promotion of Science (JSPS)
- Asahi Glass Foundation
- Grants-in-Aid for Scientific Research [23685020, 26288095] Funding Source: KAKEN
Ask authors/readers for more resources
In this work, we achieved the triplet-energy control of polycyclic aromatic hydrocarbons (PAHs) by replacing the Carbon-Carbon (CC) unit with a Boron-Nitrogen (BN) unit. Time-dependent density functional theory calculations suggested that the insertion of the BN unit may cause localization of the singly occupied molecular orbitals 1 and 2 (SOMO1/SOMO2) in the triplet state, which in turn can reduce the exchange interaction and dramatically increase the high singlettriplet excitation energy (E-T). The PAH containing the BN unit, 4b-aza-12b-boradibenzo[g,p]chrysene, showed a large ET value and ambipolar carrier-transport abilities. The introduction of a phenyl substituent on 4b-aza-12b-boradibenzo[g,p]chrysene slightly reduced the E-T values and the carrier-transport abilities, but increased the glass-transition temperatures. On the basis of these findings, we successfully built phosphorescent organic light-emitting diodes using the BN compounds as host materials, which exhibit a superior performance over the device using a representative host material, 4,4'-bis(N-carbazolyl)-1,1'-biphenyl, not only in terms of efficiency but also in terms of device lifetime. This study demonstrated the potential of BN-embedded polycyclic aromatics in organic electronics and showed a novel strategy to achieve triplet-energy control of aromatic compounds.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available