Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 2, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/lsa.2013.6
Keywords
luminescence; single-phosphor-conversion; warm-white light-emitting diode; yellow phosphor
Categories
Funding
- US National Science Foundation [DMR-0955908]
- National Basic Research Programs of China (973 program) [2012CB932504]
- Materials Sciences and Engineering Division, Office of Basic Energy Sciences (BES)
- US Department of Energy (DOE) [DE-AC02-06CH11357]
- Scientific User Facilities Division of BES
- Argonne National Laboratory
- Oak Ridge National Laboratory's Shared Research Equipment (ShaRE) User program
- Division of Scientific User Facilities of BES
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Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white (i.e., correlated color temperature, 4000 K) with good color rendition (i.e., color rendering index >80). However, no single-phosphor, single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors' emission spectrum. Here, we report a new yellow Ba0.93Eu0.07Al2O4 phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component. Warm-white emissions with correlated color temperature,4000 K and color rendering index >80 were readily achieved when combining the Ba0.93Eu0.07Al2O4 phosphor with a blue light-emitting diode (440-470 nm). This study demonstrates that warm-white light-emitting diodes with high color rendition (i.e., color rendering index >80) can be achieved based on single-phosphor, single-emitting-center conversion.
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