Patent ID: 6303403
Filing Date: 2001-10-16
Classification: C09K,Y10S

Abstract:
A method for preparing a gallium nitride phosphor represented by a formula Ga.sub.1-x In.sub.x N:A,B (0.ltoreq.x<1, A=Zn or Mg, B=Si or Ge), comprising the steps of:placing a Ga compound constituting the gallium nitride phosphor in a first heating zone of a calcination oven;generating oxygen or sulphur gas in a second heating zone of the calcination oven;flowing ammonia gas from the second heating zone to the first heating zone of the calcination oven, thereby to decompose the ammonia gas into nitrogen to be reacted with gallium in the Ga compound and hydrogen to be reacted with the oxygen or sulphur gas generated in the second heating zone; andsubjecting the Ga compound to calcination in an atmosphere containing nitrogen, hydrogen and oxygen or sulphur to nitride gallium and dope the gallium nitride with the element A or B of the formula.