液相法による球状単分散Y_2O_3 :Eu前駆体粒子合成における添加尿素およびレアアース濃度の影響

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The effect of regents concentrations for recovery and shape of precipitate on the liquid-phase synthesis of precursor particles of Y2O3 : Eu phosphor was studied. The amount of precipitant generated by hydrolysis of urea was remarkably changed by reaction temperature and initial concentration of urea. Therefore, the reaction rate of the precipitation reaction was controlled by reaction temperature and initial urea concentration. The recovery of precipitate was increased from < 10% to > 99% with the increase in urea concentration from 10 × 10-3 to 30 × 10-2 mol/dm3 in the synthesis at 92°C for 1 hour, when initial concentration of rare-earth ion was 10 mmol/dm3. On the other hand, the particle size was decreased with increase in urea concentration. The shape of particles was changed from uniform sphere to irregular aggregate with increase in initial concentration of rare-earth ion under the lower urea concentration condition. However, mono-dispersed spherical particles were formed even in that case, when the ratio of rare earth for the urea was higher. Though non-aggregated particles were amorphous basic carbonate; (Y, Eu)OHCO3, the carbonate was crystallized in the aggregated particles. By the calcination at above about 600°C, both compositions converted to the oxide; (Y, Eu)2O3, but original shapes of precipitate particles were retained after that. Therefore, mono-dispersed spherical Y2O3 : Eu phosphor particles could be obtained from morphologically identical precursors. These results indicate the range of initial reagents concentrations in which mono-dispersed spherical Y2O3 : Eu phosphor is prepared.
社団法人資源・素材学会の論文
2003-09-25

液相法による球状単分散Y_2O_3 :Eu前駆体粒子合成における添加尿素およびレアアース濃度の影響

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