Process for preparing rare earth luminescent materials

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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.