Provided herein are phosphors of the general molecular formula:

A.sub.3-2xEu.sub.xMP.sub.3O.sub.9N,

wherein the variables are as defined herein. Methods of producing the phosphors are also provided. In some aspects, the present disclosure provides light-emitting devices comprising these phosphors.

The present invention relates to a composition comprising at least one phosphor.

The present disclosure disclosed a fluorescent powder capable of promoting plant growth and preparation and use thereof. The fluorescent powder is formed by doping Ee.sup.2+ in a halophosphate containing Rb.sup.+, and has a crystal structure of Prima and a chemical formula of Rb.sub.yK.sub.2-yCaPO.sub.4F:yEu.sup.2+ The fluorescent powder is prepared by high temperature solid-state method, emits red light beneficial to plant growth under irradiation of an ultraviolet lamp or light in an ultraviolet light region to a blue light region of sunlight, can improve the utilization rate of light energy, promotes plant growth, and has a low cost, no pollution, high efficiency and no consumption of electric energy.

A phosphor composition includes a red phosphor material having a red decay rate and a green phosphor material having a green decay rate. The red phosphor material includes a Mn.sup.4+ doped phosphor of Formula I and a Eu.sup.3+ doped uranium phosphor, and a difference between the red decay rate and the green decay rate is no more than 7 ms, A.sub.xMF.sub.y:Mn.sup.4+ (I), wherein A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the MF.sub.y ion; and y is 5, 6 or 7. A device is also provided.

In one aspect, a process for preparing a Mn.sup.4+ doped phosphor of Formula I is provided A.sub.x[MF.sub.y]:Mn.sup.4+ (I). The process includes combining a first aqueous solution including a source of Mn with a second solution including H.sub.2MF.sub.6 to form a third solution, and combining the third solution with a fourth solution including a source of A to form the Mn.sup.4+ doped phosphor, where A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7. Methods, phosphors and devices are also provided.