| Title |
Simulation Study on Variations of Color Rendition Properties According to Combination of 455nm blue LED and Phosphor Emission Spectra |
| Authors |
Hyeong-Seob Jo ; Jong-Oh Kim ; Uh-Chan Ryu |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2019.33.12.001 |
| Keywords |
Color Rendition; Color Quality Scale; Fidelity Index; Phosphor Combination; RMS |
| Abstract |
Recently, studies have been performed regarding to various methods of improving color rendering properties of white LEDs by mixing warm white (WW) and cool white (CW) or red (R), green (G), blue (B), and yellow (Y) LED spectra. However, the previous researches have been insufficient in presenting maximum optical characteristics over all correlated color temperature (CCT) ranges or representing recently suggested evaluation methods of color rendering properties. In this paper, color rendering properties including the recent methods at all CCTs will be investigated through simulation combining various kinds of phosphors excited by a 455nm blue LED. For evaluating CRI values, general and special color rendering indices (Ra and R9∼14), general color quality scale (Qa), fidelity index (Rf), and color gamut (Rg) will be examined and compared by root mean square (RMS) values. 2-phosphor combination with a blue LED resulted in Ra≥95, R1∼14≥75, and Qa≥90, 3-phosphor in Ra≥98, R1∼14≥75, and Qa≥97, and 4-phosphor in Ra≥94, R1∼14≥71, and Qa≥90. |