Patent ID: 7635603

Claim:
A method for making a red-light emitting diode (red-light LED) having silicon (Si) quantum dots, comprising steps of: (a) growing a non-stoichiometric silica film covering on a substrate through an atmosphere chemical vapor deposition (APCVD); (b) processing an annealing treatment to said substrate to obtain a phase separation in said non-stoichiometric silica film to obtain on said substrate a silica film having Si quantum dots (Si QDs-SiO 2 film); and (c) placing said substrate having said Si QDs-SiO 2 film into a vacuum stove and processing a surface treatment to said substrate in an environment of oxygen gas added with a chemical reactant, wherein, in step (a), said non-stoichiometric silica film is made of a Si oxide (SiO x ) having a ratio of oxygen atoms to Si atoms smaller than 2 (x<2), the formation of the entire SiO x film including only a single deposition step.