| 摘要 |
Disclosed is a compound having a structure represented by chemical formula M(L_A)_x(L_B)_y and chemical formula III. In chemical formula M(L_A)_x(L_B)_y, ligand L_A is represented by chemical formula L_A; and ligand L_B is a monovalent anionic bidentate ligand. In the compounds, metal M has an atomic number greater than 40; x is 1, 2, or 3; y is 0, 1, or 2; x+y is the oxidation state of metal M; L^11 represents a linking group selected from alkyl, cycloalkyl, aryl, and heteroaryl; L^12 represents a linking group selected from NR^15 and PR^15; each R^1, R^2, R^3, R^4, R^5, R^6, R^11, R^12, R^13, R^14, and R^15 is independently selected from a group of substituents, wherein any adjacent substituents are randomly bonded to form a fused or unfused ring; and L_A and L_B are randomly bonded to form a ligand which is at least tetradentate ligand. In addition, disclosed are a formulation and a device such as OLED, including the compound in chemical formula M(L_A)_x(L_B)_y. |
