Luminescent silicon carbide and preparation thereof

Claim 1

THE METHOD OF PREPARING SILICON CARBIDE PHOSPHORS HAVING ROOM TEMPERATURE EMISSION WHICH COMPRISES PROVIDING A CHARGE OF SILICON CARBIDE AS A LINING WITHIN A CARBON CRUCIBLE COMPLETELY SURROUNDING AN INTERNAL POROUS CARBON VESSEL THROUGH THE CENTER OF WHICH EXTENDS A POROUS CARBON PIPE, SAID INTERNAL VESSEL AND PIPE TOGETHER DEFINING AN ANNULAR CONDENSATION CHAMBER, IMMERSING SAID CRUCIBLE IN AN INERT GAS AND FLOWING THE INERT GAS LADEN WITH A DOPING AGENT THROUGH SAID PIPE, APPLYING HEAT AROUND THE CRUCIBLE TO RAISE ITS TEMPERATURE TO THE POINT WHERE SILICON CARBIDE SUBLIMES, THE FLOW OF GAS THROUGH SAID PIPE PRODUCING A RADIAL TEMPERATURE GRADIENT FAVORABLE TO THE DIFFUSION OF SILICON CARBIDE THROUGH THE WALL OF SAID INTERNAL VESSEL AND CONDENSATION THEREOF IN SAID ANNULAR CHAMBER IN THE PRESENCE OF SAID DOPING AGENT.