Extrahigh Color Rendering Color Temperature Tunable White Light LED Cluster with Warm-white Red Green Blue LEDs

摘要

The realization of correlated color temerature (CCT) tunable white sources with a combination of high color rendering index (CRI) and the special CRI of R9 for strong red is an important challenge in the field of solid-state lighting. The CCT tunable WW/R/G/B LED cluster with extrehigh color rendering property has been found by simulation and fabricated, which consists of three WW LEDs (excited wavelengh λ_o = 450.5 nm, CCT = 3183 K, Φ = 62.11m, P_(in) = 1.15W, and η = 53.9 1m/W at I_F = 350 mA), one red LED (λ_o = 634.1 nm, Φ = 34.41m, and P_(in) = 0.83 W at I_F = 350mA), one green LED (λ_o = 513.9nm, Φ = 41.01m, and P_(in) = 1.24W at I_F = 350mA), and one blue LED (λ_o = 456.2nm, Φ = 10.21m, and P_(in) = 1.18W at I_F = 350 mA). The experimental results show that the WW/R/G/B LED cluster can realize the CCT tunable white lights with CRIs of 93 ～ 95, R9s of 90 ～ 96, averages of the special CRIs R9 to R12 of 83 ～ 85, as well as luminous efficacies of 46.8 ～ 56.8 lm/W at CCTs of 2719 K to 6497 K.