Table 1 Concentration factor (CF)a and geometric extraction efficiency (ηext) at a current density (J) of 1.0 mA cm−2 vs. the apex angle (θapex)

From: An electrophosphorescent organic light emitting concentrator

θapex (°) 15.5 25.5 35.5 55.5
CF b 2.9±0.1 2.05±0.03 1.64±0.02 1.46±0.03
ηext (%) 38.9±1.3 45.5±0.7 50.1±0.6 68.1±1.5
  1. aCF is calculated based on the effective luminance from a single panel, assuming that all four panels have identical luminous characteristics.
  2. b Errors for CF and ηext are standard deviations from at least three single-panel concentrator devices.