Quantifying angular color stability of organic light-emitting diodes

We show the need for a quantity that describes the angular dependence of the chromaticity emitted from organic light-emitting diodes (OLEDs), present different quantities that may be suitable for describing this color stability and compare these quantities to ratings obtained from a perception test to determine which quantity correlates most strongly with the observer ratings. (C) 2010 Elsevier B. V. All rights reserved.