Highly Efficient Phosphorescent Organic Light Emitting Diodes Based on Iridium(III) Complex with Bulky Substituent Spacers
We developed highly efficient phosphorescent organic light emitting diodes (PHOLEDs) using iridium(III) complex, fac-tris[4-methyl-2-2(4′-trimethylsilylphenyl)pyridine] [Ir(msippy)3]. PHOLEDs based on Ir(msippy)3 complex exhibit the yellowish–green emission with
CIE color coordinates of (0.31, 0.64). These device performances were compared with those of the green emitting Ir(ppy)3- based devices. The higher external quantum efficiency (EQE) of 25.6% and the current efficiency of 84.4 cd/A were achieved for Ir(msippy)3-based device.
The results show that the complete energy and/or charge transfer from the host to Ir(msippy)3 dopant in the emitting layer (EML) of the device resulted in the higher device efficiencies compared with those of Ir(ppy)3-based devices.
Document Type: Research Article
Publication date: 01 May 2012
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