×

Low rare earth mineral photoluminescent compositions and structures for generating long-persistent luminescence

  • US 8,952,341 B2
  • Filed: 09/06/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 09/06/2012
  • Status: Active Grant
First Claim
Patent Images

1. A low rare earth mineral photoluminescent structure for generating long-persistent luminescence, said low rare earth mineral photoluminescent structure comprising:

  • a phosphorescent layer that substantially converts at least a portion of incident electromagnetic radiation to a primary emission, said phosphorescent layer comprising one or more phosphorescent materials having substantially low rare earth mineral content of less than about 2.0 weight percent with an absorption spectrum that at least partially overlaps with incident electromagnetic radiation, andone or more fluorescent layers that wholly or partially convert at least said primary emission to a secondary emission, said one or more fluorescent layers having an absorption spectrum that overlaps with at least a portion of said primary emission, andwherein said primary emission and said secondary emission being of long-persistent luminescence.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×