CAJ | 학술논문

采用均相沉淀法制备了Y(OH)3微米颗粒，经1100℃焙烧后制备出具有上转换发光性质的Yb3+-Tm3+-Gd3+共掺的Y2 O3微米晶体，讨论了Yb3+-Tm3+-Gd3+在Y2 O3中能量传递过程及壳层对发光强度的影响。980 nm近红外光激发下的上转换光谱表明，在Yb3+-Tm3+-Gd3+共掺Y2 O3体系中，核-壳结构大幅提高了Gd3+离子和Tm3+离子的上转换发光强度，尤其是样品在紫外发光部分的增强相比于可见和红外光部分更为明显。同时，通过研究Tm3+和Gd3+在不同波段的发光强度与泵浦功率的关系探讨了氧化物中上转换发光的机制。
채용균상침정법제비료Y(OH)3미미과립，경1100℃배소후제비출구유상전환발광성질적Yb3+-Tm3+-Gd3+공참적Y2 O3미미정체，토론료Yb3+-Tm3+-Gd3+재Y2 O3중능량전체과정급각층대발광강도적영향。980 nm근홍외광격발하적상전환광보표명，재Yb3+-Tm3+-Gd3+공참Y2 O3체계중，핵-각결구대폭제고료Gd3+리자화Tm3+리자적상전환발광강도，우기시양품재자외발광부분적증강상비우가견화홍외광부분경위명현。동시，통과연구Tm3+화Gd3+재불동파단적발광강도여빙포공솔적관계탐토료양화물중상전환발광적궤제。
Y2 O3∶Yb/Tm/Gd@Y2 O3 microcrystals with core-shell structure were prepared by homo-geneous precipitation method and then annealed at high temperature. The microparticles were char-acterized by transmission electron microscopy ( TEM) , X-ray diffraction ( XRD) , and luminescent spectra. Upconversion spectra and excitation power dependence indicate that the energy transfer from Tm3+ to Gd3+ plays a crucial role in populating the excited states of Gd3+. The shortest wavelength of upconversion emissions in Y2 O3 matrix is converted from the infrared region. Meanwhile, the core-shell structure greatly improved the upconversion fluorescence intensity of Gd3+ in Yb3+-Tm3+-Gd3+ codoped system.