Phelos

Angular Luminescence Spectrometer for EL and PL Measurements  
Phelos is an angular resolved spectrometer that measures the electroluminescence (EL) and photoluminescence (PL) of OLEDs and light-emitting materials over various angles and polarization. The dipole orientation and the position of the emission zone can be determined experimentally. 

Phelos is an angular luminescence spectrometer to characterize both OLED and other light emitting devices as well as luminescence of thin films. 
Phelos measures the spectrum of OLEDs over various angles. From the data the emission-zone (position and orientation) of the device can be determined.