LED Light Improved by an Optical Filter to Visible Solar-Like Light with High Color Rendering

In this study, a new, cost-effective, rapid, and easy method to produce sunlight-like D65 light source from typical white light-emitting diode (LED) is discussed. The novelty of that the emission spectrum LED measured first, then reverse used design fabricate double-sided multilayer coating filter set in front LED. This can be verified experimentally improve color-rendering index 95.8 at color temperature. optical thicknesses film are designed quarter wavelength. layer-thickness errors during deposition process reduced due monitoring with turning-point method. By lowering both cost level technology required sources, addition most direct consequences increased availability affordability, for research heavily utilizes sources also lowered turn, especially fields clinical science, medicine, related industries.