Bismuth borate glass encapsulant for led phosphors

Patent metadata

Field	Value
Publication number	US-2017190609-A1
Application number	US-201715467494-A
Country	US
Kind code	A1
Filing date	Mar 23, 2017
Priority date	Mar 30, 2012
Publication date	Jul 6, 2017
Grant date	—

Abstract

Embodiments are directed to glass frits containing phosphors that can be used in LED lighting devices and for methods associated therewith for making the phosphor containing glass frit and their use in glass articles, for example, LED devices.

First claim

We claim:

1 . A method for making a glass article comprising:
providing a glass composition comprising Bi 2 O 3 and at least 30 mol % B 2 O 3 ; melting the composition and forming the melted composition into a glass; grinding the glass into particles to form a frit glass having the composition; blending the frit glass with one or a more phosphors to form a phosphor-frit glass mixture; converting the phosphor-frit glass mixture into a paste by adding at least one organic liquid to the mixture; applying the paste onto a surface; and firing the applied paste to burn out organic material to form a phosphor-frit glass.

2 . The method according to claim 1 , further comprising cooling the fired phosphor-frit glass to room temperature after the firing.

3 . The method according to claim 1 , wherein the firing comprises firing the applied paste in air to a temperature of approximately 350° C. at a temperature ramp rate of 2° C./min and holding the paste at approximately 350° C. for 1 hour to burn out the organic material.

4 . The method according to claim 1 , wherein the firing comprises firing the applied paste in air to a selected temperature in the range of 475-600° C. at a temperature ramp rate of 2° C./min and holding the applied paste at the selected temperature for 2 hours.

5 . The method according to claim 1 , wherein the applying comprises screen printing or tape casting the paste onto the surface.

6 . The method according to claim 1 , wherein the blending comprises mixing the frit glass and the one or more phosphors with a solvent mixture comprising propylene glycol diacetate and dimethyl carbonate.

7 . A solid glass layer comprising a glass matrix and at least one phosphor dispersed throughout the matrix, wherein the glass comprises Bi 2 O 3 and at least 30 mol % B 2 O 3 .

8 . The solid glass layer according to claim 7 , wherein a minimum in a thickness-normalized absorbance of the glass layer occurs at a wavelength of less than 416 nm.

Assignees

• Corning Inc

Inventors

• Aitken Bruce Gardiner
• Badding Michael Edward
• Borrelli Nicholas Francis
• Lonnroth Nadja Teresia
• Quesada Mark Alejandro

Classifications

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• C09K11/7774

  Aluminates · CPC title

• C03C14/006 Primary

  the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material · CPC title

• C03C3/14 Primary

  containing boron · CPC title

• C03C3/145

  containing aluminium or beryllium · CPC title