Phosphor and manufacturing method therefore, and light emission device using the phosphor

A phosphor mixture comprising;

• a phosphor which comprises Sr, Al, Si, N, O and Ce and/or Eu as a constituent element, wherein
• the content of Sr is 22.0 wt % or more and 28.0 wt % or less,
• the content of Al is 5.0 wt % or more and 18.0 wt % or less,
• the content of O is 5.0 wt % or less,
• the content of N is 27.0 wt % or more, and
• the phosphor comprises at least one element selected from the group consisting of Ce and Eu in an amount of greater than 0 and less than 5.0 wt %,
• and when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 620 nm, and a value of coefficient of variation CV calculated by the following formula is 100% or less, wherein the Coefficient of Variation CV %=standard deviation/calculated average particle size×100;
• one or more kinds of blue color emitting phosphors, and/or one or more kinds of red color emitting phosphors, in the said excitation light in the wavelength range of from 300 nm to 500 nm.

A phosphor mixture comprising a phosphor which comprises Sr, Al, Si, N, O and Ce and/or Eu as a constituent element, wherein

• the content of Sr is 22.0 wt % or more and 28.0 wt % or less,
• the content of Al is 5.0 wt % or more and 18.0 wt % or less,
• the content of O is 5.0 wt % or less,
• the content of N is 27.0 wt % or more, and
• the phosphor comprises at least one element selected from the group consisting of Ce and Eu in an amount of greater than 0 and less than 5.0 wt %,
• and when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 620 nm, and a value of coefficient of variation CV calculated by the following formula is 100% or less, wherein the Coefficient of Variation CV %=standard deviation/calculated average particle size×100;
• and one or more kinds of blue color emitting phosphors, and/or one or more kinds of red color emitting phosphors, in the said excitation light in the wavelength range from 300 nm to 420 nm.

A light emission device, comprising a phosphor comprising Sr, Al, Si, N, O and Ce and/or Eu as a constituent element, wherein

• the content of Sr is 22.0 wt % or more and 28.0 wt % or less,
• the content of Al is 5.0 wt % or more and 18.0 wt % or less,
• the content of O is 5.0 wt % or less,
• the content of N is 27.0 wt % or more, and
• the phosphor comprises at least one element selected from the group consisting of Ce and Eu in an amount of greater than 0 and less than 5.0 wt %, and when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 620 nm,
• and a light emission part for emitting light of a first wavelength,
• wherein the light of a different wavelength from the first wavelength is emitted from the phosphor, by using a part or an entire part of the light of the first wavelength as an excitation light, and a correlated color temperature of the emission spectrum of the light emission device is in the range of 2000K to 10000K.

A list emission device, comprising:

• a phosphor comprising Sr, Al, Si, N, O and Ce and/or Eu as a constituent element, wherein the content of Sr is 22.0 wt % or more and 28.0 wt % or less, the content of Al is 5.0 wt % or more and 18.0 wt % or less, the content of O is 5.0 wt % or less, the content of N is 27.0 wt % or more, and the content of Ce and/or Eu is greater than 0 and 5.0 wt % or less, and when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 620 nm;
• and
• a light emission part for emitting light of a first wavelength,
• wherein the light of a different wavelength from the first wavelength is emitted from the phosphor;
• by using a part or an entire part of the light of the first wavelength as an excitation light, and an average color rendering index Ra of an emission spectrum of the light emission device is 60 or more.