Abstract: A compact energy lamp having high luminous flux, long life and a very similar color temperature of between 2300° K and 6500° K which includes a vacuum-type discharge vessel filled with mercury and a noble gas. The inside of the discharge vessel is provided with a luminescent layer and is provided with means for maintaining discharge. The luminescent layer includes two phosphors. The first phosphor is a green-emitting gadolinium magnesium borate silicate, activated with cerium and terbium, and the second phosphor is yttrium oxide: Eu3+, which emits in the red spectral region.

Abstract: The present invention relates to variously activated luminescent metaborates having luminescence properties improved in comparison with conventional luminescent substances. Moreover, the activated luminescent metaborates have outstanding stability under the influence of short-wave UV radiation so that they are preferably suitable for use in luminescent screens, in particular, low-pressure mercury vapor discharge lamps of all types and designs. The luminescent substances of the present invention are based on rare earth metal borates of the formula:(Y,La).sub.1-x-y-z Ce.sub.x Gd.sub.y Tb.sub.2 (Mg,Zn,Cd).sub.1-p Mn.sub.p B.sub.5-q-s (Al,Ga).sub.q (X).sub.s O.sub.10wherein X is Si, Ge, P, Zr, V, Nb, Ta, W or the sum of a plurality of the stated elements and p, q, s, x, y and z are alternatively .ltoreq.1.