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Red colored phosphor and process for preparing the same

  • US 4,264,677 A
  • Filed: 02/02/1979
  • Issued: 04/28/1981
  • Est. Priority Date: 02/03/1978
  • Status: Expired due to Term
First Claim
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1. A particulate red colored phosphor that is red emitting under cathode ray excitation comprising an internal portion consisting of an europium and optionally, samarium activated oxysulfide phosphor represented by the formula


  • space="preserve" listing-type="equation">Ln.sub.2 O.sub.2 S;

    Eu, (Sm)
wherein Ln is at least at one element selected from the group consisting of yttrium, gadolinium, lanthanum, lutetium and scandium, and an external portion consisting essentially of an europium and optionally, samarium activated sulfide red colored phosphor represented by the formula (Ca1-x, Srx)S;

Eu, (Sm) wherein x is a number within the range of 0≦

x≦

0.75.

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