Phosphor compositions with orange and amber light emission

A light emitting device comprising:

• a LED die, and
• at least one garnet phosphor ceramic, wherein the at least one garnet phosphor has a formula:
• VII(Y1-x-z-w,Luz,Gdw,Cex)3VI(Al1-y,Mny)2IV(Al1-2y/3,Si2y/3)3O12,
• wherein
• (i) 0<x≤0.05,
• 0.01<y≤0.03,
• z=0,
• 0.15<w<0.40, and
• a sintering temperature is in a range of 1750-1800° C. and an internal quantum efficiency in a range of 87-94%;
• or
• (ii) 0.01<x≤0.05,
• 0.015<y≤0.03,
• z>0.4,
• 0.2≤w≤0.5,
• 1-x-z-w=0, and
• a sintering temperature is at 1800° C. and a internal quantum efficiency in a range of 83-91%;
• or
• (iii) 0.01<x≤0.03,
• 0.015<y≤0.03,
• 0.3≤w≤0.50,
• 0.1<z<0.35,
• 0.2<1-x-z-w<0.5, and
• a sintering temperature is in a range of 1775-1800° C. and a internal quantum efficiency in a range of 85-87%.

A method for preparing a garnet phosphor ceramic with the garnet phosphor having a formula:

• VII(Y1-x-z-w,Luz,Gdw,Cex)3VI(Al1-y,Mny)2IV(Al1-2y/3,Si2y/3)3O12,
• wherein
• (i) 0<x≤0.05,
• 0.01<y≤0.03,
• z=0,
• 0.15<w<0.40, and
• a sintering temperature is in a range of 1750-1800° C. and an internal quantum efficiency in a range of 87-94%;
• or
• (ii) 0.01<x≤0.05,
• 0.015<y≤0.03,
• z>0.4,
• 0.2≤w≤0.5,
• 1-x-z-w=0, and
• a sintering temperature is at 1800° C. and a internal quantum efficiency in a range of 83-91%;
• or
• (iii) 0.01<x≤0.03,
• 0.015<y≤0.03,
• 0.3≤w≤0.50,
• 0.1<z<0.35,
• 0.2<1-x-z-w<0.5, and
• a sintering temperature is in a range of 1775-1800° C. and a internal quantum efficiency in a range of 85-87%
• the method comprising:
• preparing a mixture of inorganic and/or organic precursors,
• wherein
• the Y precursor is selected from nitrates, hydroxides, organometallic compounds, oxides, yttrium containing mixed oxides and combination thereof;
• the Lu precursor is selected from nitrates, hydroxides, organometallic compounds, oxides, lutetium containing mixed oxides, and combination thereof;
• the Gd precursor is selected from nitrates, hydroxides, organometallic compound, oxides, gadolinium containing mixed oxides, and combination thereof;
• the Ce precursor is selected from nitrates, carbonates, hydroxides, organometallic compound, oxides, cerium containing mixed oxides, and combination thereof;
• the Al precursor is selected from nitrates, hydroxides, organometallic compound, oxides, aluminum containing mixed oxides, and combination thereof;
• the Mn precursor is selected from nitrates, carbonates, hydroxides, organometallic compound, oxides, cerium containing mixed oxides, and combination thereof;
• and
• the Si precursor is selected from silicates, oxides, silicon containing mixed metal oxides and combination thereof;
• and
• sintering the mixture:
• at a temperature range of 1750-1800° C. for preparing the garnet phosphor ceramic with the garnet phosphor having the formula in accordance with alternative (i),
• at a temperature of 1800° C. for preparing the garnet phosphor ceramic with the garnet phosphor having the formula in accordance with alternative (ii) or
• at a temperature range of 1775-1800° C. for preparing the garnet phosphor ceramic with the garnet phosphor having the formula in accordance with alternative (iii).

A method of preparing a light emitting device, the method comprising:

• providing a LED die;
• and
• attaching to the LED die a wavelength converting element, comprising a garnet phosphor ceramic
• wherein the garnet phosphor has a formula:
• VIII(Y1-x-z-w,Luz,Gdw,Cex)3VI(Al1-y,Mny)2IV(Al1-2y/3,Si2y/3)3O12,
• wherein
• (i) 0<x≤0.05,
• 0.01<y≤0.03,
• z=0,
• 0.15<w<0.40, and
• a sintering temperature is in a range of 1750-1800° C. and an internal quantum efficiency in a range of 87-94%;
• or
• (ii) 0.01<x≤0.05,
• 0.015<y≤0.03,
• z>0.4,
• 0.2≤w≤0.5,
• 1-x-z-w=0, and
• a sintering temperature is at 1800° C. and a internal quantum efficiency in a range of 83-91%;
• or
• (iii) 0.01<x≤0.03,
• 0.015<y≤0.03,
• 0.3≤w≤0.50,
• 0.1<z<0.35,
• 0.2<1-x-z-w<0.5, and
• a sintering temperature is in a range of 1775-1800° C. and a internal quantum efficiency in a range of 85-87%.