Evaluation of luminances and yields for red, green, and blue organic light emitting diodes

For red, green and blue OLEDs that emit for each of them in a wide spectral range (Delta lambda approximate to 200 nm), we calculate the luminous luminance, the energetic luminance and the various yields in the pseudo-monochromatic hypothesis ( ideal source generally considered), and we compare with a calculation in relation with a polychromatic system ( real source). Finally, we demonstrate that the values of the energetic luminance and of the energetic or quantum yield are practically unchanged whatever the hypothesis; on the contrary, in the simplified case of the pseudo-monochromatic source, the luminous luminance and the luminous yield of a green organic diode are overvalued in relation to the polychromatic real case, whereas for a blue or a red organic diode these parameters ( calculated in the pseudo-monochromatic hypothesis) are undervalued. The error is all the more great since the OLED emission is far away from the maximum value of the photoptical eye response.