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

U.M.O.P., CNRS FRE 2701, Faculté des Sciences et Techniques, 123 Av. Albert Thomas, 87060 Limoges, France

Corresponding author: amoliton@unilim.fr

Received: 3 November 2004
Accepted: 21 December 2004
Published online: 14 April 2005

Abstract

For red, green and blue OLEDs that emit for each of them in a wide spectral range ( 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.