Encapsulant modification in heavily phosphor loaded LED packages for improved stability

• US 9,590,148 B2
• Filed: 03/18/2014
• Issued: 03/07/2017
• Est. Priority Date: 03/18/2014
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: GE Lighting Solutions LLC (Savant Systems, LLC)
• Inventors: Chowdhury, Ashfaqul Islam, Allen, Gary Robert, Cai, Dengke
• Primary Examiner(s): Arroyo, Teresa M
• Application Number:
  US14/217,873
• Publication Number:
  US 20150270452A1
• Time in Patent Office: 1,085 Days
• Field of Search: 257/98, 257/791, 438/27
• US Class Current: 1/1
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/617 Silicates
• CPC Class Codes: C09K 11/7706 Aluminates
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

Heavily phosphor loaded LED packages having higher stability and a method for increasing the stability of heavily phosphor loaded LED packages. The silicone content of the packages is increased by decreasing the amount of one phosphor of the blend or by increasing the thickness of the silicone phosphor blend layer.

Claims

1. A heavily phosphor loaded LED package having improved color stability, comprising:

an LED and a silicone phosphor blend encapsulating the LED, wherein the silicone phosphor blend includes silicone in an amount of about 53 wt %, PFS phosphor in an amount of about 36 wt %, and BSY phosphor in an amount of about 11 wt %.

2. The LED package of claim 1, wherein the LED is a mid power LED, and the silicone phosphor blend is highly loaded with a BSY-PFS phosphor.

3. The LED package of claim 1, wherein the silicone phosphor blend provides at least a 25% improvement in color shift.