Most of the red phosphors on the ma

Most of the red phosphors on the market today are rare earth doped nitride phosphors and manganese (Mn) ion doped fluoride phosphors. The former is doped with rare earth ions, and the cost of rare earth is relatively high, and the price of rare earths has risen year after year. Trend, and the preparation cost of nitride phosphors is relatively high, and the conditions are strict, requiring high temperature (1600 degrees), high pressure of nitrogen and other conditions; the latter requires the use of hydrofluoric acid, a highly dangerous chemical substance, to prepare fluoride Phosphors, and fluoride phosphors have the problem of deliquescence, which raises the requirements for the use environment of phosphors and increases the cost, and the emission peak of fluoride phosphors is too narrow (half peak width 8nm) for LED lighting The meaning in this field is limited. Attempts of double perovskite Gd2ZnTiO6 red phosphors doped with manganese ions (Mn4 +), when the excitation wavelength is 365nm, four distinct emission peaks of manganese ions can be observed at 670nm, 685nm, 690nm, and 704nm. The powder glowed bright red.