CAJ | 학술논문

利用低温成核和高温生长的原理,选用蓖麻油酸( RA)为表面活性剂,合成了上转换纳米晶β-NaYF4:Yb,Er/Tm/Ho. 结果表明,β-NaYF4:Yb,Er/Tm/Ho纳米晶的粒径约为45 nm,晶相为纯六方相. 在980 nm激发下,β-NaYF4:Yb,Er/Tm/Ho纳米晶呈现较强的上转换发光. 通过将其溶解在二氯甲烷和水的混合溶液中可知,RA-NaYF4纳米晶只能分散在水中且在暗场下形成明亮的绿光,而二氯甲烷中没有,证明其具有良好的水中分散性,并且在酸性和碱性条件下,其荧光性能稳定.
이용저온성핵화고온생장적원리,선용비마유산( RA)위표면활성제,합성료상전환납미정β-NaYF4:Yb,Er/Tm/Ho. 결과표명,β-NaYF4:Yb,Er/Tm/Ho납미정적립경약위45 nm,정상위순륙방상. 재980 nm격발하,β-NaYF4:Yb,Er/Tm/Ho납미정정현교강적상전환발광. 통과장기용해재이록갑완화수적혼합용액중가지,RA-NaYF4납미정지능분산재수중차재암장하형성명량적록광,이이록갑완중몰유,증명기구유량호적수중분산성,병차재산성화감성조건하,기형광성능은정.
Hexagonal-phase NaYF4: Yb, Er/Ho/Tm up-conversion nanocrystals were synthesized using ricinoleic acid ( RA) as an sufficient and user-friendly surfactant. The strategy is to form small solid-state crystal nuclei at a lower temperature and then make the nuclei further grow and ripen at a higher temperature. The experiment results show that the structure of NaYF4:Yb,Er/Ho/Tm nano-crystal is hexagonal-phase with the diameter of 45 nm. The nanocrystals show strong luminescence under the excitation of a 980 nm laser with the average power about 1 W. When the nanocrystals are dispersed in the mixed solution of water and dichloromethane, we can only see a strong green bright beam in water, which demonstrates the hydrophilic characteristic of RA-NaYF4 nanocrystals. The fluorescence property of NaYF4:Yb,Er/Ho/Tm nanocrystals has no significant change in acidic me-dium or alkaline.