Abstract
High conversion efficiency and quantum efficiency is essential for the phosphor in an efficient phosphor-based white light LEDs. Here, based on the coherent harmonic and the random independent emitter model, we demonstrate theoretically that the silicon nanoantenna array can dramatically enhance the output power of emitters in a phosphor layer by investigating the far-field radiation enhancement of an electric dipole assisted by silicon nanopillars in a waveguide structure. Compared with the plasmonic silver nanoantenna array, the silicon nanoantenna array can increase the enhancement factor of light extraction efficiency (LEE) over 50% for the dipole source at the wavelength of 620 nm, thus showing potential applications in white light LEDs. The enhanced LEE is ascribed to the low-loss directional light scattering of silicon nanoantennas and the strong guided mode resonances caused by their array. The calculation results also indicate that the far-field radiation can be tailored significantly by changing the aspect ratio of silicon nanopillars while presenting a good directivity. Our research is expected to give more insights into the design and optimization of the solid-state lighting, gaining and lasing systems by integrating silicon-based nanoantennas.
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Acknowledgements
This work was supported by National Natural Science Foundations of China (Nos. 11404291, 11504333 and 11574276), Programs for Science & Technology Innovation Talents in Universities of Henan Province (No. 17HASTIT016), Science & Technology Innovative Outstanding Talents of Henan Province (No. 164200510006), Aeronautical Science Foundation of China (No. 2015ZF55013), Program for Natural Science Foundations of Henan Province (No. 162300410314), Key Program of Science and Technology of Henan Education Department (Nos. 17A140029 and 17A510019).
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Ding, P., Shao, L., Wang, J. et al. Enhanced light extraction with silicon nanoantenna arrays for white light LED applications. Opt Quant Electron 49, 194 (2017). https://doi.org/10.1007/s11082-017-1035-2
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DOI: https://doi.org/10.1007/s11082-017-1035-2