An organometallic complex is provided. The organometallic complex is selected from the group consisting of ##STR00001## ##STR00002## ##STR00003## and ##STR00004## wherein C is an acetyl acetone group ##STR00005## or picolinic acid group ##STR00006## m is 1.about.3, n is 0.about.3 and m+n=3, wherein D, E and G are the same or different and selected from the group consisting of H, halogen atoms, trifluoromethyl, C.sub.1-20 alkyl, C.sub.1-20 alkyl halide, C.sub.3-10 aryl and C.sub.3-20 heterocyclic ring containing O, N or S.