A wavelength-converting film and a light emitting device and a display device using the same are disclosed. The wavelength converting film comprises a fluoride phosphor powder with a Mn.sup.4+ as an activator, wherein the fluoride phosphor powder with the Mn.sup.4+ as the activator comprises a sheet-like crystal and has a chemical formula of A.sub.2[MF.sub.6]:Mn.sup.4+, wherein A is Li, Na, K, Rb, Cs, NH.sub.4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof.

A wavelength-converting film and a light emitting device and a display device using the same are disclosed. The wavelength converting film comprises a fluoride phosphor powder with a Mn.sup.4+ as an activator, wherein the fluoride phosphor powder with the Mn.sup.4+ as the activator comprises a sheet-like crystal and has a chemical formula of A.sub.2[MF.sub.6]:Mn.sup.4+, wherein A is Li, Na, K, Rb, Cs, NH.sub.4, or a combination thereof, and M is Ge, Si, Sn, Ti, Zr, or a combination thereof.