| 摘要 |
The invention proposes a method for producing glass ceramics which is particularly well suited as light conversion material, especially for down conversion. One initially produces a starting glass, containing (on an oxide basis) 5-50% by weight of SiO<SUB>2</SUB>, 5-50 % by weight of Al<SUB>2</SUB>O<SUB>3 </SUB>and 10-80% by weight of at least one oxide selected from the from the group formed by Y<SUB>2</SUB>O<SUB>3</SUB>, Lu<SUB>2</SUB>O<SUB>3</SUB>, Sc<SUB>2</SUB>O<SUB>3</SUB>, Gd<SUB>2</SUB>O<SUB>3</SUB>, Yb<SUB>2</SUB>O<SUB>3</SUB>, Ce<SUB>2</SUB>O<SUB>3</SUB>, as well as 0.1-30% by weight of at least one oxide selected from the group formed by B<SUB>2</SUB>O<SUB>3</SUB>, Th<SUB>2</SUB>O<SUB>3</SUB>, and oxides of the lanthanoids, except Lu<SUB>2</SUB>O<SUB>3</SUB>, Gd<SUB>2</SUB>O<SUB>3</SUB>, Yb<SUB>2</SUB>O<SUB>3</SUB>, Ce<SUB>2</SUB>O<SUB>3</SUB>. Thereafter, the material is heated up for ceramization at a heating rate of at least 100 K/min to a temperature in the range of between 1000° C. to 1400° C. until crystallites are formed that contain a garnet phase. Thereafter, the material is cooled down to room temperature. Alternatively, controlled cooling-down from the molten state is possible.
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