Abstract: There are described blue luminescent glasses having the following compositions(a) 0 to 90 mole % alkali metal oxide (sodium oxide, potassium oxide, lithium oxide), individually or several together, 0 to 90 mole % alkaline earth metal oxide (magnesium oxide, calcium oxide, strontium oxide, barium oxide), individually or several together, with the proviso that the magnesium oxide and/or calcium oxide can only be present in an amount of up to 25 mole % and at least 2 mole % of alkali metal oxide and/or alkaline earth metal oxide must be present(b)7 to 95 mole % silica0 to 70 mole % boron oxide (B.sub.2 O.sub.3)0 to 85 mole % aluminum oxide(c) 0.01 to 40 mole % lead oxide (PbO).

Abstract: There are described luminescent glasses having the following compositions(a) 0 to 80 mole % alkali metal oxide (sodium oxide, potassium oxide, lithium oxide), individually or several together, 0 to 30 mole % alkaline earth metal oxide (magnesium oxide, calcium oxide, strontium oxide, barium oxide), individually or several together, and at least 2 mole % of alkali metal oxide and/or alkaline earth metal oxide must be present(b)7 to 90 mole % silica1 to 50 mole % boron oxide (B.sub.2 O.sub.3)1 to 30 mole % aluminum oxide(c)0.1 to 5 mole % lead oxide (PbO)0.1 to 10 mole % vandium pentoxide (V.sub.2 O.sub.5).The glasses have white, yellow, or blue luminescence, depending on the PbO and V.sub.2 O.sub.5 content, at excitation with a wave length of 254 nm.

Abstract: There are prepared luminescent materials based on cadmium borate activated with manganese which is insensitive to impurities, temperature stable, not sensitive to grinding, and stable to ceramic glazes having the composition. In the preparation, the manganese activator is added in the form of a zeolite.

Abstract: There are described luminescent materials based on zinc silicate activated with manganese which are not sensitive to impurities are not susceptible to pulverizing, are temperature stable, and are stable to the customary ceramic glazes. They comprise, consist of (or consist essentially of):1.5 to 94.8 mole % zinc oxide (ZnO)1 to 90 mole % Silicon dioxide (SiO.sub.2)0.2 to 1.3 mole % Manganese oxide (MnO)0.1 to 25 mole % Alkali oxide and/or Alkaline earth oxide and/or Titanium oxide (TiO.sub.2) and/or Zirconium oxide (ZrO.sub.2) and/or Chromium oxide (Cr.sub.2 O.sub.3) and/or Lead oxide (PbO)0.1 to 23.8 mole % Sodium oxide (Na.sub.2 O)1.3 to 24 mole % Aluminum oxide (Al.sub.2 O.sub.3) and2.5 to 48 mole % Silicon dioxide (SiO.sub.2).

Abstract: There are described luminescent materials activated with lead upon excitation with long wave and short wave ultraviolet rays emit in the blue-green region, have long afterglow times, can be prepared from components which do not have high purity, are not susceptible to pulverizing, and are stable to the customary ceramic glazes. They consist of (or consist essentially of):10 to 89.9 mole % zirconium oxide (ZrO.sub.2)5 to 85 mole % boron oxide (B.sub.2 O.sub.3)5 to 85 mole % silicon dioxide (SiO.sub.2)0.1 to 20 mole % lead oxide (PbO)0 to 15 mole % sodium oxide (Na.sub.2 O)0 to 15 mole % potassium oxide (K.sub.2 O) and0 to 5 mole % aluminum oxide (Al.sub.2 O.sub.3).