CS ELSOLAR Co., Ltd. is a Korea-based company. The Company is mainly engaged in the development and manufacturing of organic light-emitting diode (OLED) materials, dye-sensitized solar cell (DSSC) materials, organic thin-film transistor (OTFT) materials and a variety of organic materials based on the organic dyes. Its OLED materials include hole transport layer, hole injection layer, electron transport layer, fluorescent host, green dopant, blue dopant and red dopant. It also provides sublimation equipment, such as vacuum sublimation purifier. The Company had five affiliated companies.