Some Halophosphates Phosphors

  • Kartik N Shinde
  • S J Dhoble
  • H C Swart
  • Kyeongsoon Park
Chapter
First Online:
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 174)

Abstract

The Halophosphate phosphor is defined as a phosphor with the apatite mineral structure. Almost all commonly found tubes on the global lighting market employ an internal coating of calcium halophosphate materials (generally known simply as ‘Halophosphate’ tubes). This revolutionary material was invented in 1942 by a group led by A. H. McKeag of Osram-GEC in London, and succeeded in almost doubling lamp efficiency. This breakthrough was responsible for propelling the fluorescent business into the vast market. However, by modern standards, halophosphate materials are relatively inefficient and deliver inferior lighting quality compared to newer technologies of fluorescent phosphors. Although fluorescent tubes have low initial purchase cost, this was rapidly offset by the increased electrical power consumption required to generate a given amount of light. Owing to their lesser energy efficiency, halophosphate tubes are being phased out and shortly replaced by other more efficient fluorescent phosphor materials. These phosphors are blends of two different materials which radiate broadly in the blue and orange parts of the spectrum, respectively. By changing the ratio of the two components a full range of warm to cool white hues can be achieved.

Keywords

Color Center Host Lattice Ammonium Dihydrogen Phosphate Photoluminescence Excitation Spectrum Lamp Industry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Kartik N Shinde
    • 1
  • S J Dhoble
    • 2
  • H C Swart
    • 3
  • Kyeongsoon Park
    • 4
  1. 1.Department of PhysicsN.S. Science and Arts CollegeBhadrawatiIndia
  2. 2.Department of PhysicsR.T.M. Nagpur UniversityNagpurIndia
  3. 3.Department of PhysicsUniversity of the Free StateBloemfonteinSouth Africa
  4. 4.Faculty of Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoulRepublic of Korea (South Korea)

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