| 简介 |
PURPOSE : A yellow fluoro sulfide fluorescent substance for light emitting diode based on cerium-doped fluorosulfide and a manufacturing method thereof are provided to a candidate for manufacturing white LED, especially for warm white-light.
CONSTITUTION : A yellow fluoro sulfide fluorescent substance has the following chemical formula : (A (1-x-y)Ce xB y) 2Ca (1-z) Sr zF 4S 2 and a tetragonal crystal phase. Here, A and B are other rare earth metal other than Ce, and 0< xΔ 1, 0Δ yΔ 1, 0Δ zΔ 1. A manufacturing method of the fluoro sulfide comprises the following steps : measuring stoichiometric amount of one or more sulfide and one or more fluoride of Ce, one or more rare earth metal except Ce, and Ca and/or Sr; uniformly mixing sulfide and fluoride by grinding; and plasticizing the mixture under a vacuum condition at 900-1100 deg. Celsius until pure crystal phase is obtained.
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