Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

The present disclosure is directed to articles such as bladders comprising mechano-luminescent materials which emit light when the mechano-luminescent materials are placed under stress. The present disclosure is also directed to articles including these bladders, methods of forming these bladders, and methods of making articles including these bladders.

The present invention provides a zinc nitride compound suitable for electronic devices such as high-speed transistors, high-efficiency visible light-emitting devices, high-efficiency solar cells, and high-sensitivity visible light sensors. The zinc nitride compound is represented, for example, by the chemical formula CaZn.sub.2N.sub.2 or the chemical formula X.sup.1.sub.2ZnN.sub.2 wherein X.sup.1 is Be or Mg. The zinc nitride compound is preferably synthesized at a high pressure of 1 GPa or more.

The present invention provides a zinc nitride compound suitable for electronic devices such as high-speed transistors, high-efficiency visible light-emitting devices, high-efficiency solar cells, and high-sensitivity visible light sensors. The zinc nitride compound is represented, for example, by the chemical formula CaZn.sub.2N.sub.2 or the chemical formula X.sup.1.sub.2ZnN.sub.2 wherein X.sup.1 is Be or Mg. The zinc nitride compound is preferably synthesized at a high pressure of 1 GPa or more.

A conversion element, a radiation-emitting semiconductor device and a method for producing a conversion element are disclosed. In an embodiment a conversion element includes a ceramic luminescent material and a flux material, wherein the flux material has a boiling temperature above 1500 C. and/or a melting temperature below 1500 C., and wherein the flux material has a concentration in the conversion element between at least 0.01 wt % and at most 1 wt %.

A conversion element, a radiation-emitting semiconductor device and a method for producing a conversion element are disclosed. In an embodiment a conversion element includes a ceramic luminescent material and a flux material, wherein the flux material has a boiling temperature above 1500 C. and/or a melting temperature below 1500 C., and wherein the flux material has a concentration in the conversion element between at least 0.01 wt % and at most 1 wt %.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

Disclosed are a method of producing an aluminate fluorescent material, such an aluminate fluorescent material, and a light emitting device. The aluminate fluorescent material production method includes: subjecting a first mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, and at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, in which a compound containing Mg may be optionally mixed, to first heat treatment to give a first calcined product having an average particle diameter D1, as measured according to a Fisher Sub-Sieve Sizer method, of 6 m or more; and subjecting a second mixture prepared by mixing a compound containing at least one metal element selected from the group consisting of Ba, Sr and Ca, at least one compound selected from the group consisting of a compound containing Mn and a compound containing Eu, and a compound containing Al, and the first calcined product whose content is 10% by mass or more and 90% by mass or less relative to the total amount of the second mixture, in which a compound containing Mg may be optionally mixed, to second heat treatment to give a second calcined product.

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