A phosphor plate including a base material, and a plate-shaped composite including phosphors dispersed in the base material, in which in a case in which an absorption spectrum of light having a wavelength of 300 nm to 700 nm is measured, when an absorbance at 455 nm is defined as A455(%), an absorbance at 700 nm is defined as A700(%), and a thickness of the phosphor plate is defined as T (mm), (A700/A455)/T satisfies 0.01 or more and 1.00 or less.

A method for fabricating a nano-particle includes preparing a nano-particle dispersion including a nano-particle having a perovskite structure with a first ligand on a surface thereof and a non-polar solvent; and mixing a silane compound, a halogen compound and the nano-particle dispersion to substitute a silane ligand for the first ligand.

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.

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.

A composition comprising

##STR00001##

In this composition Ar1 is independently selected from the group consisting of:

##STR00002##

and Ar2 is selected from

##STR00003##

Additionally in this composition, R.sub.1, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.11, and R.sub.12 are independently selected from F, Cl, H, unsubstituted or substituted branched alkyls with 1 to 60 carbon atoms, and unsubstituted or substituted linear alkyls with 1 to 60 carbon atoms; and the compositional ratio of x/y ranges from about 1/99 to about 99/1, and n ranges from 1 to 1,000,000.

A phosphor plate includes a plate-like composite including an inorganic base material, which is a sintered material of two or more types of metal oxide including SiO.sub.2, and a phosphor contained in the inorganic base material, in which the phosphor includes an α-type sialon phosphor, and in a case in which intensity of transmitted light at a wavelength of 455 nm and intensity of reflected light at a wavelength of 455 nm of the phosphor plate are denoted by T1 and R1, respectively, T1 and R1 satisfy 1.5×10.sup.−2≤T1/R1≤5.0×10.sup.−2.

A nanoplatelet including a two-dimensional template including a first semiconductor nanocrystal; and a first shell including a second semiconductor nanocrystal disposed on a surface of the two-dimensional template, the second semiconductor nanocrystal having a composition different from the first semiconductor nanocrystal, wherein the second semiconductor nanocrystal includes a Group III-V compound, and wherein the nanoplatelet does not include cadmium.

A composition comprising ##STR00001##
In this composition Ar1 is independently selected from the group consisting of: ##STR00002##
and Ar2 is selected from ##STR00003##
Additionally in this composition, R.sub.1, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.11, and R.sub.12 are independently selected from F, Cl, H, unsubstituted or substituted branched alkyls with 1 to 60 carbon atoms, and unsubstituted or substituted linear alkyls with 1 to 60 carbon atoms; and the compositional ratio of x/y ranges from about 1/99 to about 99/1, and n ranges from 1 to 1,000,000.

Quantum dots that are cadmium-free and/or stoichiometncally tuned are disclosed, as are methods of making them. Inclusion of the quantum dots and others in a stabilizing polymer matrix is also disclosed. The polymers are chosen for their strong binding affinity to the outer layers of the quantum dots such that the bond dissociation energy between the polymer material and the quantum dot is greater than the energy required to reach the melt temperature of the cross-linked polymer.

Quantum dots that are cadmium-free and/or stoichiometncally tuned are disclosed, as are methods of making them. Inclusion of the quantum dots and others in a stabilizing polymer matrix is also disclosed. The polymers are chosen for their strong binding affinity to the outer layers of the quantum dots such that the bond dissociation energy between the polymer material and the quantum dot is greater than the energy required to reach the melt temperature of the cross-linked polymer.