Triazol-rate of the same ligand square planar complex comprising a bidentate ligand square planar complex [M (N ^ N) 2 ] ( where two identical N ^ N bidentate ligand anionic ligands are coordinated to the M (II) metal center ) Have optical and electrical properties that can be usefully used in a wide variety of optical and electrical devices and applications. In particular, the complexes are useful for obtaining white or monochromatic organic light emitting diodes ("OLEDs"). Improved white organic light-emitting diode ( "WOLED") design, bis [3,5-bis (2-pyridyl) -1,2,4-triazole reyito] platinum (II) ( "Pt (ptp ) 2" ) Having improved efficiency and / or color stability at high brightness in single- or two-emitter white or monochrome OLEDs using homo-ligand square planar complexes.
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