I-V-L system using Keithley 2450 and CS-2000 (Konica Minolta) with a goniometer can measure current-voltage, current-voltage-luminance, electroluminescence spectrum, color coordinates, luminance and color depending on viewing angles, external quantum efficiency, luminous efficacy, and current efficiency of various optoelectronic devices such as OLEDs, QLEDs, LEDs etc.

​