The synthesis and photophysical properties of the robust Pt(II) emitters [(O boolean AND N boolean AND N)PtX] (HO boolean AND N boolean AND N = 6-(2-hydroxyphenyl)-2,2'-bipyridine and its derivatives; X = Cl, Br, 1, or -C C-Ph) are reported. Yellow electroluminescent devices based on these materials display a low turn-on voltage (1 cd m(-2) at 4 V) and a high luminance (37000 cd m(-2)). Complex 2e, [((FBu2O)-Bu-t boolean AND N boolean AND N)PtCl], has the highest thermal stability and gave the best OLED.
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