A compound and a composition used for light-emitting medium of an electro-luminescence device are disclosed, which has the structure as formula : 1wherein each R1 and R2 independently is C1-3 alkyl, C6-10 aryl, or R1 and R2 are together to be ; X is Cl or Br. Consequently, the number of signal lines to be activated in one cycle of a comparing operation is decreased. A joint area is formed between the first surface of the semiconductor and the upper surface of the substrate. 06 or less, enabling the color temperature of light to be set to 7,000 K or more, and further to 8,000 K or more, 9,000 K or more, or 10,000 K or more.