In the system SrO-A1203 a new compound was discovered with composition 2SrO -3A1203 (SAL); its structure is related to the one of 4SrO 9 7A1203 (SAE). The aluminate 1.29(Ba,Ca)O,6A1203 (BAL) belongs to the B-alumina type compounds and is closely related to BaMgA]10017 (BAM). The compounds SAL and BAL are good host lattices for highly efficient Eu 2 § luminescence. The europium emission peaks at 460 nm in SAL and at 440 nm in BAL. Both phosphors show a high output and good maintenance in low pressure Hg discharge lamps and are ideally suited for use in tricolor lamps.
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