Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Matthias Schiplage

Martin Zachau

Dieter Meiss

Wolfgang Gruber

The invention relates to a fluorescent lamp for the illumination of plants, having a tubular discharge vessel, two electrodes which are fused in a gastight manner into the ends of the discharge vessel, a fill comprising at least a noble gas and mercury, and a phosphor coating on the inner wall of the vessel, the phosphor coating at least including a europium-doped barium magnesium aluminate phosphor of the BaMgAlO:Eu type and a cerium- and terbium-doped gadolinium zinc magnesium pentaborate phosphor of the Gd(Zn,Mg)BO:Ce,Mn type, and, to generate light with as high a light yield as possible and with a color temperature of between 4000 and 5500 K, the phosphor coating additionally includes an antimony- and manganese-doped calcium halophosphate phosphor of the Ca(PO)(F,Cl):Sb,Mn type. This novel phosphor coating allows the light yield to be increased by 10% if the proportion by weight of the individual phosphors is optimized.

Phosphor coating composition for a mercury low-pressure discharge lamp for illuminating plants

The phosphor composition for low-pressure gas discharge lamps with a high light efficiency for generating radiation with a color temperature of greater than 5000 K and a very good general color rendering index Ra of greater than 90 includes at least one halophosphate phosphor, a phosphor which emits in the red wavelength region and a phosphor which emits in the blue-green wavelength region. In addition, according to the invention the phosphor composition contains an Eu-doped barium magnesium aluminate phosphor BaMgAl O :Eu and a Tb-doped green-emitting phosphor.

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Friedberg, Germany

Matthias Schiplage