White phosphors, methods of making white phosphors, white light emitting LEDs, methods of making white light emitting LEDs, and light bulb structures

• US 9,011,717 B2
• Filed: 08/02/2011
• Issued: 04/21/2015
• Est. Priority Date: 05/30/2006
• Status: Active Grant

• Current Assignee: The University of Georgia Research Foundation, Inc.
• Original Assignee: The University of Georgia Research Foundation, Inc.
• Inventors: Yen, William M., He, Zhiyi, Basun, Sergei, Wang, Xiao-jun, Gama, Gennaro J.
• Primary Examiner(s): Such, Matthew W
• Assistant Examiner(s): Kalam, Abul
• Application Number:
  US13/195,909
• Publication Number:
  US 20110284798A1
• Time in Patent Office: 1,358 Days
• Field of Search: None
• US Class Current: 252/301.4R
• CPC Class Codes: C09D 5/22 Luminous paints luminescent compositions C09K11/00
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/576 with alkaline earth metals
• CPC Class Codes: C09K 11/592 Chalcogenides
• CPC Class Codes: C09K 11/595 with zinc or cadmium
• CPC Class Codes: C09K 11/665 with alkali or alkaline earth metals
• CPC Class Codes: C09K 11/7421 with alkaline earth metals
• CPC Class Codes: C09K 11/7701 Chalogenides
• CPC Class Codes: C09K 11/7731 with alkaline earth metals
• CPC Class Codes: C09K 11/7787 Oxides C09K11/7785 takes precedence
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

Phosphor compositions, white phosphor compositions, methods of making white phosphor compositions, tinted white phosphor compositions, methods of making tinted white phosphor compositions, LEDs, methods of making LEDs, light bulb structures, paints including phosphor compositions, polymer compositions including phosphor compositions, ceramics including phosphor compositions, and the like are provided.

Claims

1. A method of making a phosphor composition, comprising:

providing a first phosphor compound (P1) that emits radiation in a specific color of the visible spectrum;

providing a second phosphor compound (P2) that emits radiation in a color of the visible spectrum that is complementary to the color emitted by P1, wherein both P1 and P2 have a characteristic that they each are excited by incident radiation in the same range of wavelengths; and

mixing the first phosphor with the second phosphor, wherein the mixing is performed by intimately combining P1 and P2 physically or chemically,

wherein a ratio of P1;

P2 is determined from ε

_P1/ε

_P2=m_P2/m_P1 such that the phosphor composition emits a white light wherein one of m_P2 or m_P1 is 1, wherein ε

_P1 denotes an efficiency of conversion of incident radiation into emitted radiation of the specific color by P1, ε

_P2 denotes an efficiency of conversion of incident radiation into emitted radiation of the color by P2, and m_P1 and m_P2 denote, respectively, the mass of P1 and P2 in the phosphor composition.

2. The method of claim 1, wherein m_P1 is unitary and the mass of individual P1 and P2 present in a quantity of the phosphor composition is determined by

(a) multiplying m_P2/m_P1 by the value of the mass of phosphor to be manufactured to obtain the amount of P2, m_P2, needed to make the phosphor composition;

and

(b) subtracting the amount of P2, m_P2, from the total amount to be manufactured of the phosphor composition to obtain the amount of P1, m_P1.

3. The method of claim 1, further comprising a phosphor compound (P3) that emits radiation at a region of the spectrum that tints the white light a second color selected from red, green, purple, blue, and yellow, wherein the concentration of P3 is less than about 10%.

4. The method of claim 3, wherein P3 provides the white phosphorous composition with a tint in the color of radiation emitted by P3.