Cesium-zinc halide phosphors, phosphor screens, and preparation methods

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i
• wherein
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is less than or equal to about 0.15;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is about 0.25;
• and
• i is from 0 to 0.5.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i:j A
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is greater than 0 and less than about 0.25;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is less than or equal to about 0.15;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is about 0.25;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.2.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i:j A
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is about 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is less than or equal to about 0.15;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is about 0.25;
• i is from 0 to 0.5;
• and
• j is from about 0.0001 to 0.02.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i:j A
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is about 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is less than or equal to about 0.15;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is from 0 to about 0.25;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.15.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z Ij.sub.i:jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is greater than 0 and less than or equal to about 0.5, with the proviso that if z is about 5 and j is about 0, then m is less than or equal to about 0.25;
• o=f+g+h;
• a is less than or equal to about 0.15;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is about 0.25;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.15.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i :jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is from 0 to 0.3;
• b is from 0 to 0.75;
• c is greater than 0 and less than or equal to about 0.5;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is from 0 to 5;
• i is from 0 to 0.5;
• and j is from 0 to 0.15.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i :jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is from 0 to 0.3;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is greater than 0 and less than or equal to about 0.5, with the provisos that if j is about 0 then z is greater than 0 and if j is about 0 and z is about 5 then g is greater than about 0.10;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is from 0 to 5;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.15.

A phosphor screen comprising a support and a luminescent portion including phosphor comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i :jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5;
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is from 0 to 0.3;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is greater than 0 and less than or equal to about 0.5;
• z+i is from 0 to 5;
• z is from 0 to 5;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.15.

A composition of matter comprising a combination of species characterized by the relationship:

• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i :jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof;
• r is from 0 to 1;
• v is from about 0.001 to about +1;
• n is from 0 to about 1.5:
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is from 0 to 0.3;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• z is from 0 to 5;
• i is from 0 to 0.5;
• and
• j is from 0.0001 to 0.15.

A method for preparing a storage phosphor screen for use with a stimulation light source having a predetermined wavelength band, said method comprising the steps of:

• selecting a polymeric binder having a first index of refraction at said wavelength band;
• making phosphor crystals, said crystals comprising a combination of species characterized by the relationship:
• (Cs.sub.1-r Rb.sub.r).sub.3+v-n (Zn.sub.1-m Mg.sub.m).sub.1-o (Li.sub.a Na.sub.b K.sub.c)(Ca.sub.f Sr.sub.g Ba.sub.h)Br.sub.5+v-z-i Cl.sub.z I.sub.i :jA
• wherein
• A is selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu, Mg, Pb, Bi, Mn, and In, and combinations thereof,
• r is from 0 to 1;
• v is from about -0.01 to about +1;
• n is from 0 to about 1.5:
• n=a+b+c;
• m is from 0 to 0.5;
• o=f+g+h;
• a is from 0 to 0.3;
• b is from 0 to 0.75;
• c is from 0 to 0.75;
• f is from 0 to 0.25;
• g is from 0 to 0.5;
• h is from 0 to 0.5;
• z+i is from 0 to 5;
• i is from 0 to 0.5;
• and
• j is from 0 to 0.15.;
• z is from zero to 5 and
• z/5=(r.sup.1 -r.sup.a)/(r.sup.b -r.sup.a)
• wherein r.sup.1 is said first index of refraction, r.sup.a is a second index of refraction at the same wavelength band, said second index being exhibited by phosphor crystals having the same composition except that z=5, and r.sup.b is a third index of refraction at the same wavelength band, said third index being exhibited by phosphor crystals having the same composition except that z=0;
• admixing said binder and said phosphor crystals;
• and
• placing said binder and said phosphor crystals on a support.