Evanescent coupling is used to couple light from an organic Lambertian
emitter into a single mode planar waveguide. Either an organic light
emitting diode (OLED) directly excites the waveguide mode or an OLED pumps a
photoluminescent (PL) material layer located directly on the waveguide. At
the out-coupling grating the guided light is diffracted onto an array of
organic photodiodes acting as a spectrometer. A spectral resolution of down
to 16 nm could be achieved with integrated optoelectronic system.