Luminescent material for solid-state sources of white light

• US 9,399,733 B2
• Filed: 10/22/2010
• Issued: 07/26/2016
• Est. Priority Date: 10/22/2010
• Status: Expired due to Fees

• Current Assignee: Anatoly Vasilyevich Vishnyakov, Ekaterina Analtolyevna Vishniakova, Yaohui Chang
• Original Assignee: Anatoly Vasilyevich Vishnyakov, Ekaterina Analtolyevna Vishniakova, Yaohui Chang
• Inventors: Vishnyakov, Anatoly Vasilyevich, Chang, Yaohui, Vishniakova, Ekaterina Analtolyevna
• Primary Examiner(s): Hoban, Matthew E
• Assistant Examiner(s): EDMONDSON, LYNNE RENEE
• Application Number:
  US13/820,632
• Publication Number:
  US 20130153825A1
• Time in Patent Office: 2,104 Days
• Field of Search: 252/301.4 R, 313/486, 313/503
• US Class Current: 1/1
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

A luminescent material, containing yttrium oxide, oxides of rare-earth metals, as well as aluminum, gallium and indium oxides in a ratio that produces compounds corresponding to the general formula: [(Y_1-x-y-zCe_x(Ln-1)_y(Ln-2)_z]_3-α(Al_1-p-qGa_pIn_q)₅O_12-1.5α, where α is a value varying within the 0.20≦α≦2.80 range; x is cerium atomic fraction, in the range of 0.001<x<0.15; (Ln-1)_y is one or several lanthanides of the Gd, Tb, La, Lu and Sm, which, together with yttrium and cerium, form the basis of the “cation” sub-lattice, and 0≦y≦0.90. (Ln-2)_z is one or several lanthanides of the Pr, Nd, Eu, Dy, Ho, Tm, Er and Yb group. They are dopants introduced into the “cation” sub-lattice at a rate of 0.0001<z<0.01; also x, y and z were selected in such a fashion that 1-x-y-z>0; p and q are atomic fractions of Ga and In in the aluminum sub-lattice. Their ranges are: 0<p<0.3 and 0<q<0.3.

Claims

1. A luminescent material having the formula:

[(Y_1-x-y-zCe_x(Ln-1)_y(Ln-2)_z]_3-α

(Al_1-p-qGa_pIn_q)₅O_7.80-10.005,

wherein α

is a value in the range of 0.20≦

α

≦

2.80

wherein x is the atomic fraction of cerium in the range of 0.001<

x<

0.15;

wherein (Ln-1)_y is defined as one or more of Gd, Tb, La, Lu and Sm;

wherein 0<

y<

0.90;

wherein (Ln-2)_z is defined as one or more of Pr, Nd, Eu, Dy, Ho, Tm, Er and Yb, which are dopants introduced into a cation sub-lattice in the range of 0.0001<

z<

0.01;

wherein x, y and z are present such that 1-x-y-z>

0;

wherein p and q include atomic fractions of gallium and indium in an aluminium sub-lattice, wherein 0<

p<

0.3 and 0<

q<

0.3.

2. The luminescent material according to claim 1, wherein the material is a two-phase system, wherein one phase is aluminium oxide.

3. A luminescent material having the formula:

[(Y_1-x-y-zCe_x(Ln-1)_y(Ln-2)_z]_3-α

Al₅O_7.80-10.005;

wherein α

is a value in the range of 0.20≦

α

≦

2.80;

wherein x is the atomic fraction of cerium in the range of 0.001<

x<

0.15;

wherein (Ln-1)_y is defined as one or more of Gd, Tb, La, Lu and Sm;

wherein 0<

y<

0.90;

wherein (Ln-2)_z is defined as one of Pr, Nd, Eu, Dy, Ho, Tm, Er and Yb, which are dopants introduced into a cation sub-lattice in the range of 0.0001<

z<

0.01;

wherein x, y and z are present such that 1-x-y-z>

0.

4. The luminescent material as in claim 3, wherein the material is a two-phase system, wherein one phase is aluminium oxide.

5. A luminescent material having the formula:

[(Y_1-x-yCe_x(Ln-1)_y]_3-α

Al₅O_7.80-10.005;

wherein α

is a value in the range of 0.20≦

α

≦

2.80;

wherein x is the atomic fraction of cerium in the range of 0.001<

x<

0.15;

wherein (Ln-1)_y is defined as one or more of Gd, Tb, La, Lu and Sm;

wherein 0<

y<

0.90;

wherein 1-x-y>

0.

6. The luminescent material according to claim 5, wherein the material is a two-phase system, wherein one phase is aluminium oxide.