Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 13, Pages 4076-4082Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm100960g
Keywords
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Funding
- U.S. Department of Energy [DE-FC26-06NT42934]
- GE Lighting Solutions
- agency of the United States Government
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Oak Ridge National Laboratory
- Office of Science, US Department of Energy [DE-AC02-76CH00016]
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LED lamps using phosphor downconversion can be designed to replace incandescent or halogen sources with a warm-white correlated color temperature (CCT) of 2700-3200 K and a color rendering index (CRI) greater than 90. However, these lamps have efficacies of similar to 70% of standard cool-white LED packages (CCT = 4500-6000 K; CRI = 75-80). In this report, we describe structural and luminescence properties of fluoride and oxyfluoride phosphors, specifically a (Sr,Ca)(3)(Al,Si)O-4(F,O):Ce3+ yellow-green phosphor and a K2TiF6:Mn4+ red phosphor, that can reduce this gap and therefore meet the spectral and efficiency requirements for high-efficacy LED lighting. LED lamps with a warm-white color temperature (3088 K), high CRI (90), and an efficacy of similar to 82 lm/W are demonstrated using these phosphors. This efficacy is similar to 85% of comparable cool-white lamps using typical Y3Al5O12:Ce3+-based phosphors, significantly reducing the efficacy gap between warm-white and cool-white LED lamps that use phosphor downconversion.
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