Process for preparing rare earth luminescent materials

Details Process for preparing rare earth luminescent materials Process for preparing rare earth luminescent materials

2006-06-13

2006-06-13

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

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

C252S30140H, C252S30140R

Reexamination Certificate

active

07060202

ABSTRACT:
The present invention relates to a process for preparing rare earth trichromatic phosphor, comprising the following steps: (1) providing precursors for at least one composition formula selected from the group consisting of CaBPO5:xEu:yTb, CaAlrB1-rPO5:xEu:yTb and Ca2B5O9Cl:xEu:yTb, wherein x=0.02–0.05 (mole ratio), y=0.001–0.01 (mole ratio) and r=0.5–0.8; (2) grinding and mixing the precursors; and (3) calcining the product obtained in step (2) at 800–1000° C. for 3–5 hours. According to the present process, only one matrix material and two rare earth reactive ions (Eu3+and Tb3+) are required to synthesize rare earth trichromatic phosphor. That is to say, no reducing reagent is needed; and absence of reducing agent(s) reduces environmental pollution.

REFERENCES:
patent: 6010644 (2000-01-01), Fu et al.
patent: 6402987 (2002-06-01), Srivastava et al.
patent: 6596195 (2003-07-01), Srivastava et al.
Liu et al, “New trichromatic phosphor codoped with two rare erath ions in one matrix”, Journal of the Chinese Rare Earths Society, vol. 18, No. 2, Jun. 2000, pp. 106-108.
Translation of “New Trichromatic Phosphor Codoped with Two Rare Earth Ions in One Matrix”.

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