Platinum Metals Rev., 2000, 44, (2), 66
Platinum(II) Used in Red Organic Light Emitting Devices
Red organic light emitting diodes (OLEDs) are usually produced by doping red dyes into a suitable host, such as alurniniurn(III) tris(8-hydroxyquinolate) (AlQ3). Obtaining saturated red emission with high quantum and luminous efficiencies is challenging, and the most effective complex to date to show a red colour, platinum(II) octaethylporphyrin, has been described by a group of researchers in the U.S.A. (1).
Now, this group have prepared two new Pt(II) porphyrins, PtOX and PtDPP, as phosphorescent dyes in OLEDs, by refluxing etioporphyrin III and 5,15-diphenylporphyrin, respectively, with PtCl2 (R. C. Kwong, S. Sibley, T. Dubovoy, M. Baldo, S. R. Forrest and M. E. Thompson, Chem. Mater ., 1999,11, (12), 3709-3713).
The PtOX and PtDPP were codeposited with AlQ3, at optimum doping level of 6 mol%, in the emitting layer, and the highest saturated red emission and quantum efficiencies were observed at low to moderate current densities. Energy transfer occurred between the AlQ3 and the Pt porphyrin. PtOX-doped devices reached a quantum efficiency of 1.1 per cent at 100 cd m-2with a luminous efficiency of 0.17 lm W-1.
- 1R. J. Potter, Platinum Metals Rev ., 1999, 43, ( 1 ), 12