An organometallic complex. The organometallic complex has formula (I): ##STR00001## wherein A1 is a substituted or non-substituted aromatic heterocyclic group, A2 is a substituted or non-substituted aryl group, A3 is an acetylacetone group or picolinic acid group, and X is selected from the group consisting of fluorine atom, trifluoromethyl, alkoxy, thioalkyl, and amino. The invention also provides an organic electroluminescent device utilizing the organometallic complex.