White light-emitting glass, glass-covered light-emitting element, and light-emitting device

1. A white light-emitting glass emitting fluorescence at a region having a wavelength of 380 nm to 750 nm by excitation light with a wavelength of 240 nm to 405 nm and not containing a crystal, the glass consisting essentially of:

from 27.5% to 44.4% of P 2 O 5 ;

from 0.1% to 40% of SnO x ;

from 30% to 71% of ZnO;

from 0% to 10% of M m O n ; and

from 0.1% to 2.4% of MnO y ,

percentages being based on a total amount of the above-stated components expressed in mol % on an oxide basis,

wherein:

x=1 to 2;

y=1 to 2;

M is an element selected from the group consisting of Ti, Zr, V, Nb, Cr, Ni, Cu, B, Al, Si, Cl, Ga, Ge, As, Se, Cd, In, Sb, Te, Hg, Tl, Bi, S and a rare-earth element;

m and n are independently integers of 1 or more; and

the glass does not substantially contain Li 2 O, Na 2 O and K 2 O.

2. The white light-emitting glass according to claim 1 , wherein a chromaticity coordinating position X of a light-emission color is 0.22 to 0.40 and a chromaticity coordinating position Y is 0.25 to 0.35.

3. The white light-emitting glass according to claim 1 , wherein an existence ratio of the MnO y does not exceed an existence ratio of the SnO x .

4. The white light-emitting glass according to claim 1 , containing:

from 27.5% to 40% of the P 2 O 5 ;

from 20% to 40% of the SnO x ;

from 30% to 48% of the ZnO; and

from 0% to 10% of the M m O n .

5. The white light-emitting glass according to claim 1 , containing:

from 35% to 40% of the P 2 O 5 ;

from 1% to 5% of the SnO x ;

from 50% to 60% of the ZnO; and

from 0% 10% of the M m O n .

6. The white light-emitting glass according to claim 1 , which is a light-emitting element covering glass.

7. The white light-emitting glass according to claim 1 , wherein x=1 or 2.

8. The white light-emitting glass according to claim 1 , wherein y=1 or 2.