Yellow fluorescent powder as well as preparation method and use method thereof

The invention provides yellow fluorescent powder. The general chemical formula of the yellow fluorescent powder is Bi (1-x) Ca3 (PO4) 3O: xDy < 3 + >, and x is molar fraction and ranges from 0.001 to 1. The invention relates to a preparation method of yellow fluorescent powder, which comprises the following steps: respectively weighing a compound containing Bi < 2 + >, a compound containing Ca < 2 + >, a compound containing Dy < 3 + > and a compound containing P < 3 + > according to the stoichiometric ratio of each element in the chemical formula Bi < 1-x > Ca3 (PO4) 3O: xDy < 3 + >, and carrying out presintering pretreatment to obtain a first mixture; carrying out low-temperature sintering treatment on the first mixture in an air atmosphere to obtain a pre-sintered first mixture; and naturally cooling and fully crushing the pre-sintered first mixture, performing high-temperature sintering in an air atmosphere, and naturally cooling and crushing the obtained solid to obtain the yellow fluorescent powder. 本发明提