Blue phosphor for plasma display and lamp application and method of making

A phosphor comprising:

• lanthanum phosphate phosphor with Tm3+ as an activator and Li+ and an optional amount of an alkaline earth element (AE2+) as a coactivator, having the empirical formula:
• (La1-x-y-zTmxLiyAEx)PO4
• wherein:
• 0.001<x<0.05, 0.01<y<0.05, and 0<z<0.05;
• and
• 15%-30% by weight of barium, magnesium, lanthanum aluminate (BLMA), having an empirical formula:
• (Ba1-xEux)O.MgyO.(Al2-vLavO3)x
• wherein 0.005<x<0.05, 1<y<2, 5<z<7 and 0.1<v<1.

A phosphor comprising:

• lanthanum phosphate phosphor with Tm3+ as an activator and Li+ and an optional amount of an alkaline earth element (AE2+) as a coactivator, having the empirical formula:
• (La1-x-y-zTmxLiyAEz)PO4
• wherein:
• 0.001<x<0.05, 0.01<y<0.05, and 0<z<0.05;
• and
• 15% to 30% by weight of di-valent, europium activated alkaline earth chloro apatite (AECAP) having an empirical formula:
• AE5(PO4)3Cl
• wherein AE is comprises at least one of Sr, Ca, Ba, Mg.

A phosphor comprising:

• lanthanum phosphate phosphor with Tm3+ as an activator and Li+ and an optional amount of an alkaline earth element (AE2+) as a coactivator, having the empirical formula:
• (La1-x-y-zTmxLiyAEz)PO4
• wherein:
• 0.001≦x≦0.05, 0.01≦y≦0.05, and 0≦z≦0.05;
• and
• 15% to 30% by weight of di-valent, europium activated calcium chloro borate (CCB) having an empirical formula:
• (Ca5-xEux)B5O9Cl
• wherein 0.005≦x≦0.05.

A method for forming a phosphor complex, wherein the phosphor comprises lanthanum phosphate with Tm3+ as an activator (hereafter “LPT phosphor”), Li and an optional amount of an alkaline earth element (AE2+) as a coactivator, and having the empirical formula:

• (La1-x-y-zTmxLiyAEz)PO4
• wherein:
• 0.001<x<0.05, 0.01<y<0.05, and 0<z<0.05;
• and
• 15 to 30% by weight of di-valent europium activated barium, magnesium, aluminate (BAM), having an empirical formula:
• (Ba1-xEux)O.MgyO.(Al2O3)z
• wherein 0.005<x<0.05, 1<y<2 and 5<z<7;
• said method comprising the steps of:
• a) coating on said LPT phosphor, a thin layer of a gel obtained by refluxing aluminum isopropoxide, europium nitrate, barium nitrate and magnesium nitrate in a presence of nitric acid;
• b) drying the LPT phosphor coated in step a);
• and
• c) thermally decomposing the coated LPT phosphor in a forming gas to create an LPT/BAM phosphor complex.

A method for forming a phosphor complex, wherein the phosphor comprises lanthanum phosphate with Tm3+ as an activator (hereafter “LPT phosphor”), Li+ and an optional coactivator comprising an alkaline earth element (AE2+), and having the empirical formula:

• (La1-x-y-zTmxLiyAEz)PO4
• wherein:
• 0.001<x<0.05, 0.01<y<0.05, and 0<z<0.05;
• and
• 15% to 30% by weight of di-valent, europium activated alkaline earth chloro apatite (AECP) having an empirical formula:
• AE5(PO4)3Cl
• wherein AE is comprises at least one of Sr, Ca, Ba, Mg;
• said method comprising the steps of:
• a) coating on said LPT phosphor, a thin layer of a gel obtained by refluxing trimethyl phosphate, europium chloride and at least one of:
• barium chloride, magnesium chloride, strontium chloride and calcium chloride, in the presence of hydrochloric acid;
• b) drying the LPT phosphor coated in step a);
• and
• c) thermally decomposing the coated LPT phosphor in a forming gas to create an Eu2+ activated chloro apatite phosphor complex.

A method for forming a phosphor complex, wherein the phosphor comprises lanthanum phosphate with Tm3+, as an activator (hereafter “LPT phosphor”), Li+ and an optional coactivator comprising an alkaline earth element (AE2+), and having the empirical formula:

• (La1-x-y-zTmxLiyAEz)PO4
• wherein:
• 0.001<x<0.05, 0.01<y<0.05, and 0<z<0.05;
• and
• 15 to 30% by weight of di-valent europium activated barium, magnesium, lanthanum aluminate (BLMA), having an empirical formula:
• (Ba1-xEux)O.MgyO.(Al2-vLavO3)z
• wherein 0.005<x<0.05, 1<y<2, 5<z<7 and 0.1<v<1;
• said method comprising the steps of:
• a) coating on said LPT phosphor, a thin layer of a gel obtained by refluxing aluminum isopropoxide, europium nitrate, lanthanum nitrate, magnesium nitrate and barium nitrate in a presence of nitric acid;
• b) drying the LPT phosphor coated in step a);
• and
• c) thermally decomposing the coated LPT phosphor in a forming gas to create an LPT/BLMA phosphor complex.