Electroluminescence from single-layer thin-film devices based on three binuclear Ru(II) complexes with different length of flexible bridges

The spectroscopic, electrochemical and electroluminescent properties of three binuclear Ru(II) complexes with different length of flexible bridges were investigated. The single-layer electroluminescent devices with configuration of indium–tin oxide/Ru complex (~ 100 nm)/Ga:In were found to give a turn-on voltages as low as 2.3 V, a maximum luminance up to 310 cd/m2 at a bias voltage of 5.8 V, and low delay times less than 2 s.