CAJ | 학술논문

分别以EDTA-2Na和柠檬酸钠为辅助剂,采用温和的水热法合成了六方相NaYF4：Eu3+荧光材料。利用XRD、SEM、荧光分光光度计和FT-IR对样品的结构、形貌和荧光进行了表征。在反应温度为140℃、反应时间为24 h的水热条件下,得到的样品均为纯六方相的NaYF4。以EDTA-2Na为络合剂合成的NaYF4：Eu3+为20μm的微米级球形体,而以柠檬酸三钠为辅助剂合成的NaYF4：Eu3+为长度约为1.8μm的六棱柱微晶棒。样品的尺寸分布均匀、分散性好。辅助剂在微晶体的形貌控制过程中起了很大作用。在395 nm 光的激发下,NaYF4：Eu3+发射出蓝白色光,微米级球形体的荧光强度明显强于微晶棒。
분별이EDTA-2Na화저몽산납위보조제,채용온화적수열법합성료륙방상NaYF4：Eu3+형광재료。이용XRD、SEM、형광분광광도계화FT-IR대양품적결구、형모화형광진행료표정。재반응온도위140℃、반응시간위24 h적수열조건하,득도적양품균위순륙방상적NaYF4。이EDTA-2Na위락합제합성적NaYF4：Eu3+위20μm적미미급구형체,이이저몽산삼납위보조제합성적NaYF4：Eu3+위장도약위1.8μm적륙릉주미정봉。양품적척촌분포균균、분산성호。보조제재미정체적형모공제과정중기료흔대작용。재395 nm 광적격발하,NaYF4：Eu3+발사출람백색광,미미급구형체적형광강도명현강우미정봉。
NaYF4:Eu3+ fluorescence powders were synthesized by mild hydrothermal method using EDTA-2Na as the complexing agent or sodium citrate as the assistant agent. Some physical proper-ties were characterized by powder-X-ray diffraction ( XRD) , scanning electron microscopy ( SEM) , flourescence spectra, and FT-IR. XRD results show that all the samples synthesized at 140℃ for 24 h are pure hexagonal phase NaYF4 . SEM images indicate that the as-prepared NaYF4:Eu3+ is uni-form microsphere with diameter of about 20 μm using EDTA-2Na as the complexing agent, while hexagonal prism microrod with length of 1. 8 μm using sodium citrate as the assistant agent. EDTA-2Na and sodium citrate, as assistant agent introducing into the reaction system, play a critical role in the morphology control. The morphology of the microsphere and hexagonal prism microrod is deter-mined by the complexation of EDTA-2Na and the selective adsorption of sodium citrate, respective-ly. The samples mainly emit blue-white light under 395 nm excitation. The fluorescence intensity of NaYF4:Eu3+ microsphere is much stronger than that of microrod.