Abstract
Quasi-ordered hexagonal close-packed Al nanodents, with depths of 30 nm and top-diameters of 300 nm prepared by electrochemical anodizing, are used to manage the output spectrum of white Light Emitting Diodes (LEDs). Significant short wavelength light, with a peak of 450 nm, displays significant scattering enhancements on these Al nanodents with the increment of the angle of the incidence, while long wavelength light, with a peak of 550 nm, shows weaker scattering on Al nanodents with the increment of theincidence angle. Near-field and far-field simulations reveal the effect of light coupling in the holes of Al nanodents on the selected scattering. This work could provide a striking new way to make use of cheap white LEDs.
Highlights
The invention of high efficiency white Light Emitting Diodes (LEDs) has created a new chapter for the use of energy and lighting [1,2,3]
As the white LEDs have been widely used in interior lighting, the fact that short wavelength light causes damage to eyes due to the wave crest in the blue band of the LED spectrum, especially the cheap ones, has drawn great attention [4,5,6,7]
The common resolution of the wave crest in the blue band of the LED spectrum is through the control of the red, green and blue (RGB) or the use of fluorescent substances to absorb the excessive blue light [8,9,10,11]
Summary
The invention of high efficiency white Light Emitting Diodes (LEDs) has created a new chapter for the use of energy and lighting [1,2,3]. The common resolution of the wave crest in the blue band of the LED spectrum is through the control of the red, green and blue (RGB) or the use of fluorescent substances to absorb the excessive blue light [8,9,10,11]. The former way needs expensive electronic devices to achieve the matching of each component of the RGB; the latter method has the output of the white LED fixed, which limits their application ranges.
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