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Yellow phosphor emits white light when excited with the 460 nm blue lighting. The blue LED (left half; top) when coated with dispersed yellow phosphor (right half; top) emits white light. 
Invention Summary:
Despite their low energy consumption and higher efficiency, white light-emitting diodes made of blue chip coupled with yellow phosphor has disadvantages of high correlated color temperature, relatively low color rendering index and the use of rare-earth elements (REE).
Rutgers researchers have developed a new REE-free yellow phosphor made of metal organic frameworks (MOFs) which emit yellow light upon excitation with blue light. It is achieved through a metal/ligand combination, where a highly emissive molecular fluorophore is combined with a bandgap regulating co-ligand into a MOF structure. This tunes the HOMO-LUMO energy gap to attain desired excitation and emission properties. The fabrication process of this invention can be repurposed to many other metal/ligand combinations.
Market Applications:
- Commercial/ industrial lighting
- Horticulture lighting
- Sports flood lighting
Advantages:
- 100% free of REEs
- Highest internal quantum yield of 90.7% among all the reported, blue-excited yellow phosphors
- High solution processability
Intellectual Property & Development Status: Patents issued in the USA (US 10800968 B2), Canada (CN 106459095B), EP (EP 3134416B1), and JP (JP 6731855 B2). Available for licensing and/or research collaboration. For any business development and other collaborative partnerships contact marketingbd@research.rutgers.edu
