PHOSPHOR COMPOSITION FOR A LOW-PRESSURE DISCHARGE LAMP WITH HIGH COLOR TEMPERATURE

摘要

Disclosed is a fluorescent composition for a low-pressure discharge lamp having great light efficiency and a high color temperature. Said fluorescent composition contains fluorescent materials emitting in the red wavelength range from the group comprising europium-doped yttrium oxide and cerium-dope d and manganese-doped gadolinium zinc magnesium pentaborate, fluorescent materials emitting in the green wavelength range from the group comprising cerium-doped and terbium-doped lanthanum phosphate and/or terbium-doped ceri um magnesium aluminate and/or terbium-doped cerium magnesium pentaborate, as we ll as an optional fluorescent material of the type europium-doped barium magnesium aluminate, which emits in the blue wavelength range. The invention is characterized in that the fluorescent composition additionally contains a t least one fluorescent material emitting in the blue or blue-green wavelength range from the group comprising manganese-doped and europium-doped manganese strontium barium magnesium aluminate or europium-doped and manganese-doped barium magnesium aluminate, europium-doped strontium aluminate, europium-dop ed strontium barium calcium chloroapatite, and europium-doped strontium borophosphate.