Efficient electroluminescence (EL) was obtained in organic light-emitting devices using 8-quinolinolate complexes of scandium (Scq(3)) and yttrium (Yq(3)) as emitters. Compared to the device based on the analogous Alq(3) complex, no notable difference in the EL performances of the Yq(3) device can be found; however, the EL characteristics of device with Scq(3) were significantly enhanced. The device with the configuration of indium tin oxide/N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine/Scq(3)/Yb exhibits a maximum current efficiency of 4.6 cd/A and a maximum power efficiency of 2.6 lm/W at a luminance of 300 cd/m(2). The improvement of the performance of this device should be attributed to the higher hole mobility of the Scq(3) as compared to Alq(3) or a, smaller barrier for hole injection into Scq(3) compared to Alq(3). (C) 2008 American Institute of Physics.