Novel silicate-based yellow-green phosphors

Details Novel silicate-based yellow-green phosphors Novel silicate-based yellow-green phosphors

C - Chemistry, Metallurgy

09

K

C09K 11/59 (2006.01) C09K 11/55 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2575841

Novel phosphor systems are disclosed having the formula A2SiO4:Eu2+D, where A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd; and D is a dopant selected from the group consisting of F, Cl, Br, I, P, S and N. In one embodiment, the novel phosphor has the formula (Sr1-x-yBaxMy)2 SiO4: Eu2+F (where M is one of Ca, Mg, Zn, or Cd in an amount ranging from 0<y<0.5). The phosphor is configured to absorb visible light from a blue LED, and luminescent light from the phosphor plus light from the blue LED may be combined to form white light. The novel phosphors can emit light at intensities greater than either conventionally known YAG compounds, or silicate-based phosphors that do not contain the inventive dopant ion.

La présente invention a trait à de nouveaux systèmes de phosphores de formule A2SiO4:Eu2+D, dans laquelle A est au moins un métal divalent choisi parmi le groupe constitué de Sr, Ca, Ba, Mg, Zn, et Cd; et D est un dopant choisi parmi le groupe constitué de F, Cl, Br, I, P, S et N. Dans un mode de réalisation, le nouveau phosphore est de formule (Sr1-x-yBaxMy)2 SiO4: Eu2+F (dans laquelle M est un parmi Ca, Mg, Zn, ou Cd en une quantité comprise entre 0<y<0.5). le phosphore est agencé pour l'absorption de la lumière visible en provenance d'une diode électroluminescente bleue, et une lumière luminescente en provenance du phosphore additionnée à la lumière en provenance de la diode électroluminescente bleue peut être combinée pour former de la lumière blanche. Les nouveaux phosphores peuvent émettre de la lumière à des intensités supérieures à des composés à base de grenat d'yttrium-aluminium classiques connus, ou à des phosphores à base de silicate ne contenant pas l'ion dopant de l'invention.

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