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

A method for generating long-persistent luminescence, said method comprising:

• providing a low rare earth mineral photoluminescent structure, said low rare earth mineral photoluminescent structure comprising:
• (i) a 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, and
• (ii) one or more fluorescent layers having an absorption spectrum that overlaps with at least a portion of a primary emission, and
• wherein said low rare earth mineral photoluminescent structure is subsequently exposed to incident electromagnetic radiation and said phosphorescent layer substantially converts at least a portion of incident electromagnetic radiation to said primary emission, and said one or more fluorescent layers wholly or partially convert at least said primary emission to a secondary emission, and
• wherein said primary emission and said secondary emission being of long-persistent luminescence.

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

• one or more phosphorescent materials that substantially convert at least a portion of incident electromagnetic radiation to a primary emission, said 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, and
• one or more fluorescent materials that wholly or partially convert at least said primary emission to a secondary emission, said one or more fluorescent materials having an absorption spectrum that overlaps with at least a portion of said primary emission, and
• wherein said one or more phosphorescent materials substantially enhance stability of said one or more fluorescent materials, and
• wherein said primary emission and said secondary emission being of long-persistent luminescence.

A method for fabricating a composition for generating long-persistent luminescence, said method comprising:

• incorporating 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, and one or more fluorescent materials having an absorption spectrum that overlaps with at least a portion of a primary emission into the composition, the composition being a low rare earth mineral photoluminescent composition,
• wherein said low rare earth mineral photoluminescent composition, when subsequently exposed to incident electromagnetic radiation, said one or more phosphorescent materials substantially convert at least a portion of incident electromagnetic radiation to said primary emission, and said one or more fluorescent materials wholly or partially convert at least said primary emission to a secondary emission, and
• wherein said one or more phosphorescent materials substantially enhance stability of said one or more fluorescent materials, and
• wherein said primary emission and said secondary emission being of long-persistent luminescence.

A method for generating long-persistent luminescence, said method comprising:

• providing a low rare earth mineral photoluminescent composition, said low rare earth mineral photoluminescent composition comprising:
• (i) 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, and
• (ii) one or more fluorescent materials having an absorption spectrum that overlaps with at least a portion of a primary emission, and
• wherein said low rare earth mineral photoluminescent composition is subsequently exposed to incident electromagnetic radiation, and said one or more phosphorescent materials substantially convert at least a portion of incident electromagnetic radiation to said primary emission, and said one or more fluorescent materials wholly or partially convert at least said primary emission to a secondary emission, and
• wherein said one or more phosphorescent materials substantially enhance stability of said one or more fluorescent materials, and
• wherein said primary emission and said secondary emission being of long-persistent luminescence.