Phosphor dispersion liquid and method for manufacturing LED device

Patent metadata

Field	Value
Publication number	US-9309461-B2
Application number	US-201214346854-A
Country	US
Kind code	B2
Filing date	Sep 25, 2012
Priority date	Sep 26, 2011
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

The present invention provides a phosphor dispersion liquid in which phosphor particles, laminar clay mineral microparticles, and oxide microparticles are dispersed in a solvent, wherein when a glass bottle of a 15-mm inner diameter is filled with 5 ml of the phosphor dispersion liquid and left standing, the time taken for a supernatant layer to be generated due to settling of the phosphor particles is four hours or longer.

First claim

The invention claimed is:

1. A phosphor dispersion liquid comprising a dispersion solvent, phosphor particles, laminar clay mineral microparticles, and oxide microparticles, the phosphor particles, the laminar clay mineral microparticles, and the oxide microparticles being dispersed in the dispersion solvent, wherein
the laminar clay mineral microparticles have a plate shape, and
when 5 ml of the phosphor dispersion liquid is charged into a glass bottle of 15 mm inner diameter and allowed to stand, the time it takes for a supernatant layer to be generated due to settling of the phosphor particles is 4 hours or longer.

2. The phosphor dispersion liquid according to claim 1 , wherein the phosphor dispersion liquid has a viscosity of 80 to 1,000 cp.

3. A method of manufacturing an LED device, comprising:
providing an LED chip package including a package and an LED chip disposed on the package, the LED chip having an emission surface; and
applying on the emission surface of the LED chip the phosphor dispersion liquid according to claim 1 to form a phosphor layer.

4. The method according to claim 3 , wherein the phosphor dispersion liquid is applied using a spray applicator,
the spray applicator including a coating solution tank for storing the phosphor dispersion liquid, a head having a nozzle for discharging the phosphor dispersion liquid, and a connector tube for allowing communication between the coating solution tank and the head.

5. The method according to claim 3 , further comprising applying on the emission surface of the LED chip a solution containing an organometallic compound.

6. The method according to claim 3 , wherein the LED device is a white LED device.

Assignees

• Konica Minolta Inc

Inventors

• Sato Atsushi

Classifications

• H10W90/724

  between a chip and a stacked insulating package substrate, interposer or RDL · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• Y02B20/00

  Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps · CPC title

• C09K11/7774 Primary

  Aluminates · CPC title

• H10H20/8511

  characterised by their material, e.g. binder · CPC title