研究目的
To manage the output spectrum of white LEDs using quasi-ordered hexagonal close-packed Al nanodents to reduce the damage caused by blue light.
研究成果
Quasi-ordered hexagonal close-packed Al nanodents have been used to manage the output spectrum of white LEDs. The light scattering on Al nanodents showed high angle- and wavelength-dependence. Through the control of the incidence angle, the intensity of light in white LEDs can be easily tuned. This work could benefit the application of cheap white LEDs in indoor lighting in less-developed regions.
研究不足
The selected light scattering did result in a reduction of light intensity by about 5–10% in the whole spectrum, which was mainly caused by the back scattering of light within short wavelengths.
1：Experimental Design and Method Selection:
Quasi-ordered hexagonal close-packed Al nanodents were prepared by electrochemical anodizing and used to manage the output spectrum of white LEDs.
2：Sample Selection and Data Sources:
Al nanodents with depths of 30 nm and top-diameters of 300 nm were prepared. A cheap white LED composed of a blue LED with yellow phosphor was used as the lighting source.
3：List of Experimental Equipment and Materials:
Field emission scanning electron microscope (SEM, Hitachi UHR FE-SEM SU8010), AFM (Agilent 5500), optical fiber spectrometer (Ocean USB 4000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The morphology of Al nanodents was characterized with SEM and AFM. The far-field scattering light was characterized with an optical fiber spectrometer.
5：Data Analysis Methods:
Simulations based on FDTD of the near-field light enhancement and the far-field scattering on Al nanodents were performed.
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