CAJ | 학술논문

采用溶胶-凝胶(Sol-gel)法制备了Li+共掺杂的Er3+-Yb3+:TiO2粉末.976 nm激光激发下在波长350～1700nm范围内观察到了紫外、蓝色、绿色和红色上转换发光和红外下转换发光.随着Li+共掺杂浓度由0增大到20mol%,Er3+-Yb3+:TiO2的紫外、可见和红外发光强度同步增强.低Li+共掺杂浓度引起的Li+固溶以及高Li+共掺杂浓度引起的相变过程相继破坏了Er3+的晶体场对称性,导致紫外、可见和红外发光显著增强.结果表明共掺杂Li+是一种提高Er3+掺杂材料发光性能的有效方法.
채용용효-응효(Sol-gel)법제비료Li+공참잡적Er3+-Yb3+:TiO2분말.976 nm격광격발하재파장350～1700nm범위내관찰도료자외、람색、록색화홍색상전환발광화홍외하전환발광.수착Li+공참잡농도유0증대도20mol%,Er3+-Yb3+:TiO2적자외、가견화홍외발광강도동보증강.저Li+공참잡농도인기적Li+고용이급고Li+공참잡농도인기적상변과정상계파배료Er3+적정체장대칭성,도치자외、가견화홍외발광현저증강.결과표명공참잡Li+시일충제고Er3+참잡재료발광성능적유효방법.
The Er3+-Yb3+:TiO2 powders by Li+ codoping have been prepared by sol-gel method. Both uhraviolet, blue,green and red upconversion and infrared downconversion emissions in the wavelengths of 350-1700 nm were observed by a 976 nm semiconductor laser diode (LD) excitation. The ultraviolet, visible and infrared emissions of Er3 +-Yb3 +:TiO2 enhanced simultaneously by increasing Li+ from 0 to 20mol%. The significant enhancement of ultraviolet, visible and infrared emissions resulted from the distortion of crystal field symmetry of Er3+ caused by the dissolving of Li+ at lower Li+ codoping concentration and the phase transformation at higher Li+ concentration. It can be concluded that codoping with Li+ is an efficient method to enhance the luminescence of Er3+ doped materials.