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27 August 2009 Fabrication and properties of hybrid polymer/small-molecular phosphorescent OLEDs based on poly(N-vinyl carbazole)
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Abstract
The properties of phosphorescent fac tris(2-phenylpyridine) iridium [Ir(ppy3)]-doped poly(N-vinyl carbazole) (PVK)/4,7-diphenyl-1,10-phenanthroline (Bphen) polymer/small molecular hybrid OLEDs are described. For optimal BPhen thickness, the power efficiency of the devices exceeds 30 lm/W. The low-temperature electroluminescence- detected magnetic resonance (ELDMR) exhibits the well-known negative spin 1/2 resonance attributed to enhanced formation of trions, but the positive spin 1/2 resonance, typically observed at low temperature or at high current density, is not observed. The OLEDs' performance and the ELDMR results are discussed in relation to the nature of the defects and their density in these devices.
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Teng Xiao, Min Cai, Ying Chen, Ruth Shinar, and Joseph Shinar "Fabrication and properties of hybrid polymer/small-molecular phosphorescent OLEDs based on poly(N-vinyl carbazole)", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 741521 (27 August 2009); https://doi.org/10.1117/12.828336
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