We report the fabrication and the characterization of white organic light emitting devices consisting of a single light emitting layer of blue-emitting bis(2-methyl-8-quinolinolato) (triphenyl-siloxy)aluminium (III) (SAlq) doped with red-emitting 4-di...
We report the fabrication and the characterization of white organic light emitting devices consisting of a single light emitting layer of blue-emitting bis(2-methyl-8-quinolinolato) (triphenyl-siloxy)aluminium (III) (SAlq) doped with red-emitting 4-dicy-anomethylene-2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]quinolizin-8-yl)vinyl]-4H-pyran) (DCM2). White light emissioncan be obtained from the incomplete energy transfer from SAlq to DCM2 and the direct trapping of carriers at DCM2. Theelectroluminescence (EL) spectrum consists of two broad peaks around 480 and 570 nm, resulting in white light emission with theCIE coordinates (0.32, 0.38). The introduction of the PEDOTPSS buer layer leads to an increase in the current density andthe luminance by a factor. 6 under the forward bias. The device with PEDOTPSS shows an EL turn-on voltage of about 3 V andthe maximum luminance of 18,100 cd/m2 at the bias of 13.2 V. The luminous eciency is about 2.1 lm/W and the external quantumeciency is 1.9% at a luminance of 100 cd/m2.