Fig. 4: Performance of as-fabricated white LED devices.
From: Emerging ultra-narrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition
Emission spectra of the white LED devices fabricated with the commercial yellow phosphor YAG:Ce, the commercial red phosphor KSF:Mn4+ and a without or b with the cyan phosphor NKLSO:8%Eu2+ on a blue LED InGaN chip (λ = 455 nm) under a current of 20 mA. The insets show photographs of the fabricated white LEDs. c Experimental spectra of the white LED without the sample (x = 0), white LED with the sample (x = 1) and theoretical spectrum x = 0.9. d The Ra index plot per x for different theoretical spectra, THEOR(λ) = LED1(λ) + x × DIFF(λ) with a maximum at x = 0.9 and theoretical maximum Ra (theoretical max) = 95.7
