Case Study on Combination of Fluorescent Materials for White LED to Obtain High Color Rendering Indexes

摘要

This letter reports on white-LED with high color rendering property. We realized the white-LED whose average Color Rendering Index (CRI) is as high as 94.2 by applying the commercial Red, Yellow, Green and Blue phosphors to near ultraviolet-LED. So far as we know, this value is the highest ever attained in white-LED around the color temperature of 5500[K]. In order to realize the good Ra (average CRI), we made a CRI simulator and simulated the spectrum distribution of white-LED with good R{sub}a. The spectrum distribution obtained by this simulation was proved to be very useful as a landmark for realizing a prototype white-LED with good R{sub}a.