Light Recycling Lens for High-Power-Density LED Light Sources
Light recycling is a method for developing high-power-density incoherent light sources,which combines significant challenges and high efficiency.However,the high processing difficulty and cost of traditional light recycling channels limit their widespread application.For this purpose,a spherical reflective film-coated light recycling lens is proposed,adopting a design method that is easy to model and process.This lens can be flexibly combined and matched,and it is suitable for LED chips of any wavelength,making it especially ideal for high-power-density LED applications.Simulations and experimental comparisons of three standard wavelengths were conducted in the industrial and medical fluorescence detection fields,namely 365 nm,385 nm,and 455 nm.Among them,the measured values of far-field power-density enhancement in the 385 nm wavelength range are 19.56%‒25.19%,which can meet the needs of some enterprises for increasing light source power density.This work innovatively demonstrates a design method for high-power-density lenses and presents an experimental process for a high-power-density light recycling channel.Thanks to the analysis and demonstration of experimental results,this concept provides new paths and design ideas for lighting enterprise designers,with potentially significant economic benefits.
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