A new core material, indenopyrazine, was substituted with diphenylamine groups on the locations 2 and 8, to synthesize new green emitting material, DPA-SPY, for OLED, of which emission wavelength was changed by adjusting the dipole property and the conjugation length. And, DPA-SPY was used as an emitting material layer when non-doped devices were fabricated, and the features were checked: DPA-SPY showed a sharp green spectrum, as with the EL maximum wavelength of 500 nm, narrow FWHM of 49 nm, CIE coordinates of (0.288, 0.538), and luminous efficiency of 0.99 cd/A at the current density of 10 mA/cm(2).