(19)
(11) EP 2 623 580 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
25.09.2013 Bulletin 2013/39

(43) Date of publication:
07.08.2013 Bulletin 2013/32

(21) Application number: 11828519.6

(22) Date of filing: 21.04.2011
(51) International Patent Classification (IPC): 
C09K 11/08(2006.01)
 C09K 11/64(2006.01)
(86) International application number:
PCT/JP2011/059780
(87) International publication number:
WO 2012/042957 (05.04.2012 Gazette 2012/14)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 27.09.2010 JP 2010215759

(71) Applicant: Denki Kagaku Kogyo Kabushiki Kaisha
Tokyo 103-8338 (JP)

(72) Inventor:
  • EMOTO, Hideyuki
    Machida-city Tokyo 194-8560 (JP)

(74) Representative: Gulde Hengelhaupt Ziebig & Schneider 
Patentanwälte - Rechtsanwälte Wallstrasse 58/59
10179 Berlin
10179 Berlin (DE)

   


(54) PROCESS FOR PRODUCTION OF BETA-SIALON


(57) The purpose of the present invention is to provide a process for producing a β-SiAlON having higher fluorescence intensity. The present invention relates to a process for producing a β-SiAlON, which comprises a mixing step of mixing a raw material powder containing silicon, aluminum and europium, a burning step of burning the mixed raw material under the atmosphere of an inert gas or a non-oxidizing gas to produce a β-SiAlON represented by the following general formula: Si6-zAlzOzN8-z:Eu (0 < z < 4.2), an annealing step of annealing the resulting β-SiAlON, and a step of treating the annealed β-SiAlON with an acid. The annealing is carried out under a reductive atmosphere at an atmospheric pressure of 100 kPa to 10 MPa inclusive at an atmospheric temperature of 1200 to 1600 DEG C inclusive for a treatment period of 1 to 24 hours inclusive.