Light-emitting electrochemical cells based on a solution-processed multilayered device and an anionic iridium (III) complex

• Phosphorescent anionic Ir(III) complex investigated as emitter for light-emitting electrochemical cells.
• Investigation of the device configuration to enhance the device performance.
• Introduction of a PVK layer in LEC to avoid pinholes.
• Determination of the device lifetime at different applied voltage.
• Heteroleptic complex characterized by UV–vis and luminescence spectroscopy.

The optical and electronic properties of a solution-processed light-emitting electrochemical cell (LEC) based on an anionic iridium (III) complex as the emitter material has been designed and investigated. The obtained multi-layered devices emitted light of a light-green color (CIE, x = 0.29, y = 0.45) at low external applied voltage. The electroluminescent devices fabricated from this anionic iridium complex exhibited a relatively moderate electroluminescent efficiency and a luminance as high as 140 cd/m2 at 7.2 V.

Figure optionsDownload as PowerPoint slide