LUMINESCENT SCREEN

摘要

16 A luminescent screen provided with a luminescent layer (4) formed on a carrier (1), which layer comprises an aluminate and/or a gallate of strontium and/or barium activated by bivalent europium or by trivalent chromium. The aluminate and/or gallate has an orthorhombic crystal structure with a space group Pnnm and has a composition defined by the formula Me2-xEuxA6-yCryO11 (Me = Sr, Ba and A = Al, Ga). An advantageous application of such a luminescent screen is found in low-pressure mercury vapour discharge lamps.