1212005-20-3Relevant academic research and scientific papers
The synthesis and photoluminescence characteristics of novel blue light-emitting naphthalimide derivatives
Wang, Yi,Zhang, Xiaogen,Han, Bing,Peng, Junbiao,Hou, Shiyou,Huang, Yan,Sun, Huiqin,Xie, Minggui,Lu, Zhiyun
experimental part, p. 190 - 196 (2010/11/16)
Substitution at the 4-position of 1,8-naphthalimide with electron-donating phenoxy or tert-butyl modified phenoxy groups, novel naphthalimide derivatives were obtained which emitted blue fluorescence with emission peaks of 425-444?nm in chloroform solution under UV irradiation, with highest relative photoluminescence quantum efficiency of 0.82. When in solid film, only compounds that contained ortho-tert-butylphenoxy substituents displayed blue photoluminescence of 438-451?nm, with highest absolute fluorescence quantum yield of 0.29; whereas other compounds showed greenish blue fluorescence at 471-478?nm, with highest absolute fluorescence quantum yield of 0.42. Cyclic voltammetry studies revealed that the molecules have low-lying energy levels of the lowest unoccupied molecular orbital (LUMO) ranging from -3.29?eV to -3.24?eV, and energy levels of the highest occupied molecular orbital (HOMO) ranging from -6.26?eV to -6.16?eV, suggesting they may possess good electron-transporting or hole-blocking properties. The findings indicate that the molecules offer potential as dopants as well as non-doping light-emitting materials with good electron injection capabilities for fabrication of blue or greenish blue organic light-emitting diodes.
