Voltage-controlled multicolor emitting devices

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Abstract
Voltage-controlled multicolor emitting devices were fabricated by combining an organic light-emitting diode and a solid-state electrochemiluminescent device. Though the device has a simple-stacking structure with Ru(II) complex, tris(8-hydroxyquinolinato) aluminum, 4 , 4 ′ -bis( 2 , 2 ′ -diphenylvinyl)- 1 , 1 ′ -biphenyl, and N , N ′ -bis(naphthalen-1-yl)- N , N ′ -bis(phenyl)-benzidine as basic materials, it is able to stably emit different colors, from pure green to pure red or from pure blue to pure red, under different driving biases. Its luminance can reach up to 1836 cd ∕ m 2 with current efficiency reaching 1.84 cd ∕ A . The Ru(II) complex is considered to play a dominant role in this kind of device due to its unique reversible redox property.