| abstract |
A novel OLED device is provided. A novel phosphorescent tetradentate platinum compound represented by the formula (I) in FIG. (G is the structure below; G is fused to any two adjacent carbon atoms of Ring A; Rings B to D are each independently a 5- or 6-membered carbocyclic or heterocyclic aromatic ring; L1 ~ L3 are each independently a single bond, BR, NR, PR, O, S, Se, C = O, S = O, SO2, CRR ', SiRR' or GeRR '; A1 to A8 are C or N; R4 is independently mono- to tetra-substituted; R, R ', R1 to R4 are each independently H, D, halide, alkyl, cycloalkyl, arylalkyl, aryl, carbonyl, nitrile, etc.) 3 |