Spectroscopy and Spectral Analysis, Volume. 31, Issue 9, 2328(2011)
Luminescence Characteristics of PVK Doped with Ir(Fppy)3
In the present work, the photoluminescence (PL) and electroluminescence (EL) characteristics of Tris[2-(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.
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GAO Li-yan, ZHAO Su-ling, XU Zheng, ZHANG Fu-jun, SUN Qin-jun, ZHANG Yan-fei. Luminescence Characteristics of PVK Doped with Ir(Fppy)3[J]. Spectroscopy and Spectral Analysis, 2011, 31(9): 2328
Received: Nov. 10, 2010
Accepted: --
Published Online: Nov. 9, 2011
The Author Email: Li-yan GAO (08118355@bjtu.edu.cn)