A wavelength conversion element includes a phosphor layer having phosphor particles and a binder, and a holding member including alumina, configured to hold the layer. The binder includes glass and is configured to bind a part the adjacent particles. The holding member has a pore, defining an apparent porosity thereof as X, bending strength A of the holding member fulfills A=−7.11X+316.52, an elastic modulus B of the holding member fulfills B=−6.26X+288.43, and defining an elastic modulus of the glass as C, 1/B+1/C=D, and a product of a difference between a linear expansion coefficient of the holding member and a linear expansion coefficient of the glass and a transition point of the glass as Y, Y<(A)(D)(0.001) when the linear expansion coefficient of the glass is smaller than the linear expansion coefficient of the holding member in a temperature range from the transition point of the glass to a room temperature.

Provided is an aluminate fluorescent material having a high emission intensity and having a composition containing a first element that contains one or more of Ba and Sr, and a second element that contains Mg and Mn. In the composition, when a molar ratio of Al is 10, a total molar ratio of the first element is a parameter a, a total molar ratio of the second element is a parameter b, a molar ratio of Sr is a product of a parameter m and the parameter a, a molar ratio of Mn is a product of a parameter n and the parameter b. The parameters a and b satisfy 0.5<b<a≦0.5b+0.5<1.0, the parameter m satisfies 0≦m≦1.0, and the parameter n satisfies 0.4≦n≦0.7.

Provided is a phosphor having superior light-emitting properties. A phosphor composition includes: a nitride phosphor that contains, in a composition thereof, an element M that is at least one selected from the group consisting of rare earth elements except cerium, silicon, nitrogen, and cerium; and an oxyfluoride. In the phosphor composition, a content of the oxyfluoride relative to the phosphor composition is 1.5% by mass or higher and 10% by mass or lower according to an X-ray diffraction reference intensity ratio method.

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.m−2XSi.sub.12-m−nAl.sub.m+nO.sub.nN.sub.16-n:Eu.sup.2+, where 2≦m≦5, 2≦n≦10, 0.01≦X≦1. The light emitting element package of the embodiment can display white light having improved brightness and color rendering index.

A method of manufacturing a fluorescent-material-containing member includes: providing a fluorescent member including a fluorescent material, the fluorescent member having a first main surface side including a plurality of projections; disposing a powder of a light-reflective member between the projections of the fluorescent member; obtaining a sintered body by sintering the powder of the light-reflective member, and removing part of the sintered body from at least one of a first main surface side and a second main surface side of the fluorescent member to obtain the fluorescent-material-containing member including a first surface arranged on the first main surface side has and defined by the fluorescent member and the light-reflective member, and a second surface arranged on the second main surface side has and defined by the fluorescent member and the light-reflective member or defined solely by the fluorescent member.

Disclosed is a method for manufacturing crystals of aluminates of one or more element(s) other than aluminium, referred to as “A. The method includes: placing starting reagents, including at least one aluminium element source and a source of the element(s) A that has a degree of oxidation of between 1 and 6, in suspension in a liquid medium, forming a suspension referred to as the “starting suspension”; milling the starting suspension at ≤50° C., in a three-dimensional liquid medium ball mill for ≤5 minutes; recovering, at the outlet of the three-dimensional ball mill, a suspension referred to as the “end suspension” including the starting reagents in activated form or crystals of aluminate of the element(s) A generally in hydrated form; if required, calcination of the end suspension when it includes the starting reagents in activated form, to obtain generally non-hydrated crystals of aluminate of the element(s) A.

A method of producing a silicate fluorescent material, the method includes: providing a raw material mixture that contains an M source containing M, an Mg source, an Eu source, and an Si source, and optionally an Mn source, obtaining at least one core particle comprising a silicate fluorescent composition having a formula: (M.sub.1-cEu.sub.c).sub.3a(Mg.sub.1-dMn.sub.d).sub.bSi.sub.2O.sub.8, in which M is at least one element selected from the group consisting of Ca, Sr, and Ba, and a, b, c, and d are numbers respectively satisfying 0.93≤a≤1.07, 0.90≤b≤1.10, 0.016≤c≤0.090, and 0≤d≤0.22; using a chemical vapor deposition method, depositing aluminum oxide on surfaces of the at least one core particle; and heat treating at a temperature in a range of 210° C. to 490° C. in an oxygen-containing atmosphere.

A composite oxide contains oxides of aluminum, strontium, cerium, lanthanum, and manganese. A light emitting aspect of the composite oxide when the composite oxide is irradiated with a first electromagnetic wave having a wavelength not longer than 300 nm is different from a light emitting aspect of the composite oxide when the composite oxide is irradiated with a second electromagnetic wave having a wavelength longer than 300 nm.

The present disclosure relates to a photolithography process method and a display device manufactured thereby, and more particularly, to a photolithography process method using a quantum dot thin film having greatly improved resistance to an organic solvent by applying a quantum dot coated with ligand onto a substrate and injecting a precursor used in atomic layer deposition, and a display manufactured thereby.

A pearlescent pigment for security purposes according to an embodiment of the present invention includes a single or a plurality of coating layers containing a metal oxide and an organic or inorganic fluorescent material. Since the pearlescent pigment for security purposes according to the present disclosure includes a fluorescent layer containing the organic or inorganic fluorescent material, it can be used as a pigment for security purposes due to its optical characteristics and can also provide effects such as magnetism, high color intensity, multiple colors, etc. Also, since the pearlescent pigment for security purposes has aesthetic benefit and security characteristic at the same time, it is economical, easy to use and applicable in various industries.