Patent ID: 6132647
Filing Date: 2000-10-17
Classification: C09K,H05B,Y10S

Abstract:
A blue light emitting material, comprising:a host material in which calcium (Ca), gallium (Ga), and sulfur (S) are main comonents; andcerium (Ce) doped as a luminescent center in the host material,wherein an X-ray diffraction spectrum of said blue light emitting material in a case in which Cu K.alpha. radiation is used as an X-ray source has at least one peak in diffraction angles of 13.5.+-.0.2 degrees, 14.6.+-.0.2 degees, and 25.7.+-.0.2 degrees, andwherein, when a chemical formula of said host material is expressed in a form of CaGa.sub.X S.sub.Y, X is in a range of from not less than 1.4 to not more than 1.9 and Y is in a range of from not less than 2.9 to not more than 3.8.