An inkjet nozzle assembly includes a nozzle chamber positioned on a substrate and an actuator for ejecting an ink droplet from a nozzle aperture when a resistive element of the actuator is heated by an electrical current. The covering may include a head rail, an end rail, and a cellular panel operably connected between the head rail and the end rail. Therefore, the acenaphthoquinoxaline derivative can be suitably used for a light-emitting element.