THULIUM-CONTAINING FLUORESCENT SUBSTANCE FOR WHITE LIGHT EMITTING DIODE AND MANUFACTURING METHOD THEREOF

摘要

The present invention relates to a thulium-containing fluorescent substance for a white light emitting diode represented by a following chemical formula 1, [Chemical Formula 1 ] (M1-X-J7EuxTnIy)2SiO4 where M is a divalent cation metal including Sr or Ba, with 0.005 < x < 0.05 and 0.005 < y < 0.05. The silicate-based yellow fluorescent substance according to the present invention is sufficiently excited by a blue light source generated by a blue LED to exhibit a yellow emission, with superior luminous intensity, due to the addition of europium oxide (Eu2O3) and thulium oxide (Tm2O3) as an activator, thereby being suitable for a white LED.