A solution phase synthesis process for preparing a rare earth perovskite, the process includes reacting an alkali metal material with a first surfactant ligand in the presence of a first solvent to obtain a first precursor complex solution; reacting a rare earth metal halide with a second surfactant ligand in the presence of a second solvent to obtain a second precursor complex solution; and reacting the first precursor complex solution with the second precursor complex solution in the presence of a third surfactant ligand and a third solvent to obtain the rare earth perovskite; wherein: the rare earth perovskite is in the form of nanocrystals; and the first solvent and third solvent comprise a non-coordinating solvent.

In a phosphor according to an aspect, an emission site has a perovskite crystal structure expressed by ABX.sub.3, in which A and B are each a cation and X is an anion, and an emission element is located at a B site serving as a body center of the perovskite crystal structure.

Provided is a wavelength conversion member that is less decreased in luminescence intensity with time by irradiation with light of an LED or LD and a light emitting device using the wavelength conversion member. A wavelength conversion member is formed of an inorganic phosphor dispersed in a glass matrix, wherein the glass matrix contains, in % by mole, 30 to 85% SiO.sub.2, 0 to 20% B.sub.2O.sub.3, 0 to 25% Al.sub.2O.sub.3, 0 to 3% Li.sub.2O, 0 to 3% Na.sub.2O, 0 to 3% K.sub.2O, 0 to 3% Li.sub.2O+Na.sub.2O+K.sub.2O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 4% ZnO, and the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphate phosphor.

Lanthanide double perovskite nanocrystals are described. The nanocrystals display high energy luminescence, making them useful in a variety of light-emitting materials and devices. Methods of preparing the lanthanide double perovskite nanocrystals using a hot injection method are also described.

Mixed halide scintillation materials of the general formula AB.sub.(1y)M.sub.yX.sub.wX.sub.(3w), where 0y1, 0.05w1, A may be an alkali metal, B may be an alkali earth metal, and X and X may be two different halogen atoms, and of the general formula A.sub.(1y)BM.sub.yX.sub.wX.sub.(3w), where 0y1, 0.05w1, A maybe an alkali metal, B may be an alkali earth metal, and X and X are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu.sup.2+ or Yb.sup.2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl.sup.+, Na.sup.+ and In.sup.+.

An embodiment provides a phosphor composition and a light emitting device package comprising the same, wherein the phosphor composition comprises green phosphor, amber phosphor, and red phosphor, wherein the amber phosphor is expressed as chemical formula Li.sub.m2XSi.sub.12mnAl.sub.m+nO.sub.nN.sub.16n:Eu.sup.2+, where 2m5, 2n10, 0.01X1. The light emitting element package of the embodiment can display white light having improved brightness and color rendering index.

Codoped alkali and alkaline earth halide scintillators are described. More particularly, the scintillators are codoped with tetravalent ions, such as Ti.sup.4+, Zr.sup.4+, Hf.sup.4+, Ge.sup.4+. The codoping can alter one or more optical and/or scintillation property of the scintillator material. For example, the codoping can improve energy resolution. Radiation detectors comprising the scintillators and methods of detecting high energy radiation using the radiation detectors are also described.

Mixed halide scintillation materials of the general formula AB.sub.(1-y)M.sub.yX.sub.wX.sub.(3-w), where 0y1, 0.05w1, A may be an alkali metal, B may be an alkali earth metal, and X and X may be two different halogen atoms, and of the general formula A.sub.(1-y)BM.sub.yX.sub.wX.sub.(3-w), where 0y1, 0.05w1, A maybe an alkali metal, B may be an alkali earth metal, and X and X are two different halogen atoms. The scintillation materials of formula (1) include a divalent external activator, M, such as Eu.sup.2+ or Yb.sup.2+. The scintillation materials of formula (2) include a monovalent external activator, M, such as Tl.sup.+, Na.sup.+ and In.sup.+.

Mixed halide scintillation materials of a first general formula A.sub.4B.sub.(1-y)M.sub.yX.sub.6(1-z)X.sub.6z and a second general formula A.sub.(4-y)BM.sub.yX.sub.6(1-z)X.sub.6z are disclosed. In the general formulas, A is an alkali metal, B is an alkaline earth metal, and X and X are two different halogen atoms. Scintillation materials of the first general formula include a divalent external activator M such as Eu.sup.2+ or Yb.sup.2+ or a trivalent external activator M such as Ce.sup.3+. Scintillation materials of the second general formula include a monovalent external activator M such as In.sup.+, Na.sup.+, or Tl.sup.+ or a trivalent external activator such as Ce.sup.3+.

Provided is a wavelength conversion member that is less decreased in luminescence intensity with time by irradiation with light of an LED or LD and a light emitting device using the wavelength conversion member. A wavelength conversion member is formed of an inorganic phosphor dispersed in a glass matrix, wherein the glass matrix contains, in % by mole, 30 to 85% SiO.sub.2, 0 to 20% B.sub.2O.sub.3, 0 to 25% Al.sub.2O.sub.3, 0 to 3% Li.sub.2O, 0 to 3% Na.sub.2O, 0 to 3% K.sub.2O, 0 to 3% Li.sub.2O+Na.sub.2O+K.sub.2O, 0 to 35% MgO, 0 to 35% CaO, 0 to 35% SrO, 0 to 35% BaO, 0.1 to 45% MgO+CaO+SrO+BaO, and 0 to 4% ZnO, and the inorganic phosphor is at least one selected from the group consisting of an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an oxychloride phosphor, a halide phosphor, an aluminate phosphor, and a halophosphoric acid chloride phosphor.