| 摘要 |
512,154. Glass manufacture. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. fur Elektrische Gluhlampen). March 11, 1938, Nos. 7639, 34376 and 36685. [Class 56] [Also in Group XL] Luminescent materials for electric discharge lamps consist of a matrix comprising the borate and/or phosphate of one or more of Li, Na, K, Rb, Cs, Be, Mg, Zn, Cd, Ca, Sr, Ba, Al and La with an activator consisting of the borate and/or phosphate of -Ag, Tl, Sn, Pb, Ce, or Sb, more than three molecular per cent. of the material being formed by the activator. The colour obtained by different mixtures is set out in a table. Manganese may be added as an activator to give orange-red or red light. When manganese is used, up to 50 per cent. of the borate or phosphate radical in the material may be replaced by a silicate radical with change of colour towards yellow. The material may be prepared by heating the component borate and/or phosphates, the activators being introduced as borates or phosphates; or the metals may be introduced as oxides, carbonates or oxalates and converted by phosphoric or boric acid or ammonium phosphate. The material may be melted together or sintered and the salts may be present as metaborates or metaphosphates. If the materials are melted and obtained in crystalline or vitreous form the phosphate or borate radical should be in proportion greater than corresponding to metaphosphate or metaborate. Specifications 460,210 and 476,945 are referred to. According to the first Provisional Specification the matrix may consist of the phosphate and/or borate of any metal in the first three groups of the periodic table. |
