The luminescence line narrowing technique is applied to the cyclometalated complexes [Rh(thpy)2bpy]+, [Rh(thpy)2en]+ and [Rh(phpy)2bpy]+ (thpyH = 2-(2-thienyl)pyridine, bpy = 2,2'-bipyridine, en = ethylenediamine and phpyH = 2-phenylpyridine). The dependence on temperature and the influence of different hosts are studied.