A study on the properties of organic light-emitting devices based on lutetium complex
Rare earth metals have attracted much attention because of their unique electronic structure and abundant transition energy levels.An electroluminescent devices were prepared by vacuum deposition with rare earth metal lutetium complex,Lu(DBM)3Pyphen,as emitting layer.The structure is ITO/m-MTDATA/TPD/TPD∶Lu(DBM)3Pyphen/Lu(DBM)3Pyphen/LiF/Al.m-MTDATA is hole injection layer and TPD is hole transport layer.The maximum brightness and current efficiency are 911 cd/mi2 and 1.1 cd/A,respectively.Significantly during voltage change,emissions of devices shift from 580 nm at 13 V to 550 nm at 26 V.Commission Internationale de L'Eclairage(CIE)coordinates shift from(0.485,0.479)for orange to(0.391,0.533)for yellow green.The color changes of the device with voltage dependence which provides a novel strategy for visual information storage.
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