More than 900 types of OLED front-end material compounds have been developed, and more than 1,500 types of synthesis routes have been independently developed, and the products have achieved full coverage of luminous layer materials and universal layer materials Original "complexation - crystallization - analysis - ion adsorption" four-step purification method: only one sublimation is required, product content ≥ 99.5%, total ion content ≤ 1ppm Development of deuterated materials and creating a new direction for OLED luminescent materials