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| How to properly block LED blue light | |||
| 작성자 | Department of External Cooperation | 작성일 | 2019-09-11 |
| 조회수 | 106 | ||
| How to properly block LED blue light | |||||
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Department of External Cooperation |  |
2019-09-11 |  |
106 |
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Development of blue light blocking film, 'eye protection · light efficiency ↑' Films that can increase the light efficiency while blocking blue light, which is pointed out as a disadvantage of LED lighting, have been developed and attracting attention.
WLEDs, which are now widely used for lighting due to their high efficiency and long life, use blue LEDs and yellow phosphors to produce white light. Recent studies show that blue light (~ 450 nm) of WLEDs causes optic nerve damage and sleep disorders in children. It has been reported to cause problems such as cataracts, glaucoma and macular degeneration. In order to prevent this, existing blue light blocking films or lenses released at home and abroad are a method of blocking blue light from being transmitted. These products have a limit of 30 ~ 40% of actual blocking rate or block the light according to the incident angle of blue light, and also have a limit in light efficiency due to energy loss due to blue light blocking. The carbon quantum dot film developed by Professor Yang showed higher light efficiency than the existing blue light blocking film because it protects the eyes by blocking blue light by changing the blue wavelength of the LED to green wavelength and does not affect the light transmittance. . Professor Yang made a film with different concentrations of carbon quantum dots and tested it. When the concentration of carbon quantum dots was 20 wt.%, it showed 85.8% of blocking effect, and 40wt.% showed 95.9% of blocking effect. Professor Yang said, "We expect that this carbon quantum dots film can be produced in various shapes and thicknesses, so that it can be widely used in mobile phones, computer monitors, TVs, lighting and eyeglasses." Professor Yang published a paper in the international journal <Nano Energy> (IF = 15.548) that published the study 'Ultraviolet to blue blocking and wavelength convertible films using carbon dots for interrupting eye damage caused by general lighting'. <Pukyong Today>
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