Fluorescent substance for light-emitting diode

Details Fluorescent substance for light-emitting diode Fluorescent substance for light-emitting diode

2006-04-04

2010-02-16

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C252S30140R

Reexamination Certificate

active

07662311

ABSTRACT:
A novel fluorescent substance for a light-emitting diode, emitting light of any one of three primary colors by excitation of an ultraviolet light-emitting diode. Alternatively, a novel fluorescent substance for a light-emitting diode, emitting light in a red region of a spectrum by excitation of a blue light-emitting diode. Na2SrSi2O6is doped with Eu3+. Preferably, Eu3+is added so as to account for 1 to 80 mol % in concentration in a host crystal, while sites of Si4+in Na2SrSi2O6. are replaced by Al3+and/or Ga3+. Alternatively, Ca3Si2O7is doped with Ce3+and Tb3+. Preferably, Ce3+and Tb3+are added so as to account for 0.1 to 80 mol % and 0.1 to 20 mol % in concentration in a host crystal, respectively. Still alternatively, Ca3Si2O7is doped with Eu2+. Preferably, Eu2+is added so as to account for 0.5 to 10 mol % in concentration in the host crystal.

REFERENCES:
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International Search Report for PCT/JP2006/307139 mailed Jun. 13, 2006.
“Effect of charge compensators on synthesis and luminescence of Eu (III)-activated phosphors”, by Liu, Zuwu; Tie Shaolong, Xiangtan Daxue Ziran Kexue Xuebao (1992), 14(4), pp. 6-11., Chemical Abstracts, vol. 120, No. 283460 (1994).(RN: 154875-32-8).

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