Bright and efficient stacked color-tunable organic light emitting devices (OLEDs) using intermediate Al/Au electrode
have been reported. The effects of the thickness of Al and Au layer on the luminance characteristics have been
comprehensively studied. After the optimization, After the optimization, the bottom-emission single-unit OLED of
4,4',4"-Tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine /N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-biphenyl)-
4,4'-diamine /tris(8-hydroxyquinoline) aluminum has a maximum luminance efficiency (ηL) of 3.37 by using Al/Au as
the cathode and 2.92 cd/A by using Al/Au as the anode. By introducing the optimized intermediate Al/Au electrode into
the stacked color-tunable OLEDs, red unit with maximum ηL of 4.73 cd/A and blue unit with maximum ηL of 3.96 cd/A
have been obtained. The color can be tuned efficiently along a linear route from pure red with the Commission
Internationale de l'Eclairage (CIE) coordinates of (0.662, 0.330) to sky blue with the CIE coordinates of (0.155, 0.340).
This scheme can be a potential candidate for achieving high brightness and efficient stacked color-tunable OLEDs.