Method for synthesizing red long afterglow luminescent powder La2O2S: Sm

Abstract

The invention discloses a synthesizing method of red long afterglow luminescent powder of La2O2S:Sm. La2O3, Na2CO3 and S are weighed according to a mol ratio of 1:1:2; Sm2O3 is added as an activator and the adding amount of the Sm2O3 is 2 to 8 percent of the mole number of the La2O3; besides, sodium dodecyl sulfate is added into a surface modifier and the adding amount of the sodium dodecyl sulfate is 5 to 20 percent of the mole number of the La2O3; then the mixture is fully grinded and mixed to be uniform in a mortar and then is arranged in a small corundum crucible; after the cover of the small corundum crucible is covered for compacting, the small corundum crucible is arranged in a large corundum crucible; carbon grains are filled in the clearance of the two corundum crucibles; the corundum crucible is arranged in a micro-wave oven for heating for 20 to 40 min and then a sample is obtained by taking the corundum crucible out after the corundum crucible is cooled. A micro-wave method can fast synthesize the luminescent powder of La2O2S:Sm which has the advantages of high purity, good crystallization and uniform granularity; besides, the adding of the sodium dodecyl sulfate can reduce the aggregation and growing of the grains, can obtain the luminescent powder with less grain diameters and effectively improves the luminescent intensity of the powder.

Description

technical field [0001] The invention relates to the synthesis technology of inorganic powder materials, in particular to a red long afterglow luminescent powder La 2 o 2 Synthetic method of S:Sm. Background technique [0002] Red long afterglow phosphor La 2 o 2 As a new type of luminescent material, S:Sm has good stability and can be widely used in many fields such as night lighting, night road signs, channel warning, arts and crafts, interior decoration, etc., and has important economic benefits and social value. . [0003] At present, the research on red long-lasting phosphors is mainly focused on developing new types, seeking new methods and enhancing the dispersion of powders. The synthesis of luminescent powder usually adopts the traditional high-temperature solid-phase method. The disadvantages of the solid phase method are that the synthesis temperature is high, the time is long, and the equipment requirements are high; the particle size distribution is uneven,...

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Problems solved by technology

The disadvantages of the solid phase method are that the synthesis temperature is high, the time is long, and the equipment requirements are high; the particle size distribution is uneven, it is difficult to obtain spherical particles, and it needs to be pulverized to reduce the particle size, so that the morphology of the luminescent body is incomplete and the crystal form is destroyed. , leading to a decrease in luminous performance

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