Ir(Fppy)_3掺杂PVK体系发光特性的研究

对蓝色磷光材料Ir(Fppy)3不同浓度掺杂PVK薄膜的光致发光(PL)和电致发光(EL)特性进行了研究。并制备了结构为ITO/PEDOT:PSS/PVK:Ir(Fppy)3/BCP/Alq3/LiF/Al的蓝色磷光有机电致发光器件。实验结果发现,磷光材料掺杂浓度不同,器件发光特性不同。当Ir(Fppy)3掺杂浓度比较低时,EL光谱中可以观察到PVK较弱的发光;当Ir(Fppy)3掺杂浓度较高时,会发生浓度猝灭;当Ir(Fppy)3掺杂浓度比较适中时,EL光谱中观察不到PVK的发光,只有Ir(Fppy)3的发光。通过I-V-L特性的比较,当掺杂浓度为4%时,器件的光电特性最好。

Luminescence characteristics of PVK doped with Ir(Fppy)3

In the present work, the photoluminescence (PL) and electroluminescence (EL) characteristics of Tris2-(2,4-difluorophenyl)pyridine]iridium(III) (Ir(Fppy)3) doped poly(n-vinylcarbazole) (PVK) with different doping concentrations were investigated. And a blue phosphorescent organic light-emitting diode (OLED) with the structures of ITO/PEDOT : PSS/PVK : Ir(Fppy)3/BCP/Alq3/LiF/Al was fabricated. The experimental results show that the luminescence performances of devices are different as the doping concentration of Ir(Fppy)3 is different. When the doping concentration of Ir(Fppy)3 is lower, the luminescence of PVK can be found in EL spectra. When the doping concentration is too high, concentration quenching may occur. As the doping concentration is suitable, the luminescence of PVK can not be found, only the luminescence of Ir(Fppy)3 can be found in EL spectra. It is concluded that the device with doping concentration of 4% has the best photoelectric performance according to its current density-voltage-luminance curve.