CAJ | 학술논문

以磷酸三丁酯作为配体,使用高温溶液法合成了掺铒磷酸镧纳米晶体,高分辨电镜和XRD结果表明产物尺寸均一,直径4 nm左右,具有高度的结晶性,在甲苯等有机溶剂中分散性良好.近红外发光光谱表明,产物在1535 nm处有发光峰,半高全宽为50 nm,高于目前掺铒光纤放大器(EDFA)的增益带宽.通过IR、元素分析研究发现,使用真空干燥等方法不能有效去除纳晶表面的羟基.为了进一步消除表面缺陷和猝灭基团对纳晶发光性质的影响,我们尝试在其外围生长一层LaPO_4壳做成核壳粒子以消除表面缺陷和隔离猝灭基团,结果表明,新的纳晶的发光强度得到了显著提高.
이린산삼정지작위배체,사용고온용액법합성료참이린산란납미정체,고분변전경화XRD결과표명산물척촌균일,직경4 nm좌우,구유고도적결정성,재갑분등유궤용제중분산성량호.근홍외발광광보표명,산물재1535 nm처유발광봉,반고전관위50 nm,고우목전참이광섬방대기(EDFA)적증익대관.통과IR、원소분석연구발현,사용진공간조등방법불능유효거제납정표면적간기.위료진일보소제표면결함화졸멸기단대납정발광성질적영향,아문상시재기외위생장일층LaPO_4각주성핵각입자이소제표면결함화격리졸멸기단,결과표명,신적납정적발광강도득도료현저제고.
Rare earth ions (Er~(3+), Eu~(3+) and Yb~(3+)) doped LaPO_4 and YbPO_4 nanocrystals were synthesized by a coordinate precipitation method. In a high temperature organic solution the LaCl_3 and tributyl phosphate form a complex and react with H_3PO_4 to yield LaPO_4 nanocrystals. The structural properties of LaPO_4 nanocrystals were studied by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM),Fourier transform infrared spectrometer (FT-IR). HRTEM measured the size about 4 nm and showed the clear lattice fringe image of the nanocrystals which validated the high crystallinity. XRD patterns show that the samples crystallized in monazite structure. The emission of the nanocrystals under 975 nm excited was measured and the peak was at 1535 nm. Elemental analysis result revealed that the common desiccation in vacuum was failed to remove the residual quenching group such as O-H and C-H. When coated by a LaPO_4 shell the fluorescence intensity was obviously enhanced. It validated the conclusion that the core/shell structure could enhance the emission of nanocrystals.