Spectral Optimization Of Color Temperature Tunable White Light LED Research

Both Color Rendering property and Luminous Efficacy are important factors to evaluate the quality of LED white-light source. The challenge in designing LED white-light clusters achieve high color rendering index over a reasonable range of color temperatures, meanwhile maximizing the LERs. In order to study the palette, which is Spectral optimization of Color Temperature Tunable white light LED with high color rendering index, This paper use the simulation study. In order to simulation results more actual spectrum, we proposed a mathematical model for spectra of light-emitting diodes (LED). The red, yellow, green and blue LED spectral distribution were validated by experiment in different drive current conditions. The results show that this spectral model fitting LED spectral distribution is very close to the actual measurement of the spectral distribution, which is better than other spectral models. The experiments further show that this spectral model is also applicable to the phosphor. We studied spectral optimization of Color Temperature Tunable white light LED with maximum luminous efficacy under different color temperatures(2700-6500K) and conditions of CRI≥85,90andR9≥85,90, which is produced by four different combination models:three multiple LEDs with single color to generate white light (R/G/B); four multiple LEDs with single color to generate white light (R/G/B/Y); use the red yellow LED and green phosphor excited by blue LED to generate white light (W/R/Y); use the red, green, yellow LED and green phosphor excited by blue LED to generate white light (W/R/G/Y) with new spectral model. The results showed that R/G/B combination model can reach the condition of CRI>85and Rg≥85; R/G/B/Y combination model can reach the condition of CRI>85and R9≥90; W/R/Y combination model can reach the condition of CRI>90and R9>90(except the CCT=2700K,then CRI=85); W/R/G/Y combination model can reach the condition of CRI>90and R9≥90. This paper studied the optimal spectrum of R/G/B,R/G/B/Y, W/R/Y,W/R/G/Y combination models with maximum LER under different color temperatures(2700-6500K) and different conditions, then the best peak wave length of all color composition was figured out. we compared the maximum result, which can be achieved the results:under the different conditions of CRI and different conditions of CRI and R9will decline with the increasing demand for color rendering, also decline with the CCT increased; Finally this paper studied the change of CRI, R9and LER of white light LED as the separately change of the peak wave length of red, yellow, green, blue light of optimal spectrum.