... Hz, 7.6 Hz, 3H), 7.35 (t, J = 8.2 Hz, 7.3 Hz, 3H), 7.09 (d, J = 7.9 Hz ... To investigate the the EL properties of the PI-based materials, we first tried the frequently used ... To further investigate the EL application of the multifunctional material BPPI, we fabricated the simple double-layered ...