ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Synthesis and luminescent properties of novel organic luminescent materials based on carbazole derivatives
Yingxiang Duan, Yanhua Yang, Bo Cen, Kecheng Shen, Xian Tao, and Yingzhong Shen
Nanjing University of Aeronautics and Astronautics, Nanjing, People’s Republic of China
Abstract: Four novel host materials C1–C4 based on carbazole derivatives have been designed, synthesized, characterized, and applied as organic light-emitting devices. This report presents a novel approach, which combines carbazole and aromatic hydrocarbons through methylene. The formed molecules exhibited twisted structures, which resulted in high glass transition temperatures (Tg), ranged from 90.4 to 148.0 °C. They also had high optical bandgaps (Eg), their optical energy bandgaps are determined by absorption edge technique as 3.22 to 3.50 eV, evaluated photo-physical properties of these synthesized novel chromophores, the optical properties such as maximum absorption and emission wavelengths (λ, nm), molar extinction coefficients (ε, cm− 1 M− 1), Stoke’s shifts (ΔλST, nm), and quantum yields (φF) also studied the effect of solvent polarity on absorption and emission of these carbazole derivatives, and these compounds exhibited intense absorption bonds between 250 and 325 nm, which are attributed to the π–π* transition of the carbazole-centered units. In addition, they showed blue fluorescence in different solvents. These compounds showed bathochromic shift with the increase in the solvent polarity.
Keywords: Carbazole ; Methylene ; Tg ; Eg ; The optical properties ; Blue fluorescence
Full paper is available at www.springerlink.com.
Chemical Papers 72 (11) 2955–2963 (2018)