Multinary oxynitride phosphor, and light emitting device, image display, illuminating device and phosphor-containing composition using the same, and multinary oxynitride

1. A multinary oxynitride phosphor comprising a crystal phase represented by general formula [I]:

M1 x Ba y M2 z L u O v N w   [I]

where:

M 1 represents at least one activation element selected from the group consisting of Cr, Mn, Fe, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and includes at least Eu or Ce;

M 2 represents at least one divalent metal element selected from the group consisting of Sr, Ca, Mg and Zn;

L represents a metal element, including Si, selected from metal elements belonging to the fourth group or the fourteenth group of the periodic table; and

x, y, z, u, v and w are numeric values in the following ranges:

0.03 ≦x≦ 0.9;

0.9 ≦y≦ 2.95;

x+y+z= 3;

u=6;

v=12; and

w=2.

2. The multinary oxynitride phosphor according to claim 1 , wherein the crystalline structure of the multinary oxynitride phosphor comprises a trigonal unit cell.

3. The multinary oxynitride phosphor according to claim 1 , wherein a peak wavelength λ p (nm) of an emission spectrum of the phosphor, when measured with excitation light of 400-nm wavelength, is in a range of from greater than 500 nm to 550 nm.

4. The multinary oxynitride phosphor according to claim 1 , wherein the multinary oxynitride phosphor comprises a BSON crystal phase defined as follows:

a crystal phase of which diffraction peak is observed within the range (R 0 ) of the diffraction angle ( 2 θ) of from 26.9° to 28.2°, in X-ray diffraction measurement using a CuKα as an X-ray source, wherein:

when that a diffraction peak (P 0 ) is taken as the reference diffraction peak, with 5 diffraction peaks, other than the diffraction peaks existing in the angle range of from 20.9° to 22.9°, derived from the Bragg angle (θ 0 ) of P 0 shown by P 1 , P 2 , P 3 , P 4 and P 5 respectively in increasing order of angle and with diffraction angle ranges of these diffraction peaks shown by R 1 , R 2 , R 3 , R 4 and R 5 ,

R 1 , R 2 , R 3 , R 4 and R 5 indicate the following angle ranges respectively:

R 1 =R 1 s˜R 1 e,

R 2 =R 2 s˜R 2 e,

R 3 =R 3 s˜R 3 e,

R 4 =R 4 s˜R 4 e,

R 5 =R 5 s˜R 5 e,

at least one diffraction peak exists in all the ranges of R 1 , R 2 , R 3 , R 4 and R 5 , and, to the highest diffraction peak height among those of P 0 , P 1 , P 2 , P 3 , P 4 and P 5 , P 0 has an intensity of 20% or stronger in diffraction peak height ratio and at least one of P 1 , P 2 , P 3 , P 4 and P 5 has a peak intensity of 5% or stronger in diffraction peak height ratio,

when two or more diffraction peaks exist in each angle range of R 0 , R 1 , R 2 , R 3 , R 4 or R 5 , the peak having the highest peak intensity of them is taken as P 0 , P 1 , P 2 , P 3 , P 4 or P 5 , and

R 1 s , R 2 s , R 3 s , R 4 s and R 5 s , indicating the starting angles of R 1 , R 2 , R 3 , R 4 and R 5 respectively and R 1 e , R 2 e , R 3 e , R 4 e and R 5 e , indicating the ending angles of R 1 , R 2 , R 3 , R 4 and R 5 respectively, are the following angles:

R 1 s: 2×arcsin {sin(θ0)/(1.994×1.015)}

R 1 e: 2×arcsin {sin(θ0)/(1.994×0.985)}

R 2 s: 2×arcsin {sin(θ0)/(1.412×1.015)}

R 2 e: 2×arcsin {sin(θ0)/(1.412×0.985)}

R 3 s: 2×arcsin {sin(θ0)/(1.155×1.015)}

R 3 e: 2×arcsin {sin(θ0)/(1.155×0.985)}

R 4 s: 2×arcsin {sin(θ0)/(0.894×1.015)}

R 4 e: 2×arcsin {sin(θ0)/(0.894×0.985)}

R 5 s: 2×arcsin {sin(θ0)/(0.756×1.015)}

R 5 e: 2×arcsin {sin(θ0)/(0.756×0.985)}.

5. The multinary oxynitride phosphor according to claim 4 , wherein, in X-ray diffraction measurement using a CuKα as an X-ray source, the strongest peak intensity of the impurity phase, among the measurement results of the X-ray diffraction, is 40% or weaker to the strongest peak intensity of the P 0 , P 1 , P 2 , P 3 , P 4 and P 5 .

6. A phosphor-containing composition comprising:

the multinary oxynitride phosphor according to claim 1 ; and

a liquid medium.