CAJ | 학술논문

采用微波辐射辅助柠檬酸络合法制备Ho3+/Tm3+/Yb3+共掺杂CaWO4纳米晶升频转换荧光粉。将柠檬酸络合物前驱体在300~700°C热处理3 h。Ho3+/Tm3+/Yb3+共掺杂CaWO4C在400°C时开始结晶，在600°C时结晶完成。经600°C 热处理的 Ho3+/Tm3+/Yb3+共掺杂 CaWO4主要呈球形，且形态均匀。在980 nm 的激光激发下， Ho3+/Tm3+/Yb3+共掺杂CaWO4纳米晶出现肉眼可见的明亮的白色升频转换发射，这种现象来自Tm3+的475 nm蓝光发射以及Ho3+的543 nm绿光和651 nm红光发射。通过调整Tm3+和Ho3+的浓度可以控制Ho3+/Tm3+/Yb3+共掺杂CaWO4的CIE色度图从冷到暖白色之间变化。讨论了Tm3+和Ho3+浓度对升频转换光性能的影响以及与激光泵功率相关的影响机制。
채용미파복사보조저몽산락합법제비Ho3+/Tm3+/Yb3+공참잡CaWO4납미정승빈전환형광분。장저몽산락합물전구체재300~700°C열처리3 h。Ho3+/Tm3+/Yb3+공참잡CaWO4C재400°C시개시결정，재600°C시결정완성。경600°C 열처리적 Ho3+/Tm3+/Yb3+공참잡 CaWO4주요정구형，차형태균균。재980 nm 적격광격발하， Ho3+/Tm3+/Yb3+공참잡CaWO4납미정출현육안가견적명량적백색승빈전환발사，저충현상래자Tm3+적475 nm람광발사이급Ho3+적543 nm록광화651 nm홍광발사。통과조정Tm3+화Ho3+적농도가이공제Ho3+/Tm3+/Yb3+공참잡CaWO4적CIE색도도종랭도난백색지간변화。토론료Tm3+화Ho3+농도대승빈전환광성능적영향이급여격광빙공솔상관적영향궤제。
The nanocrystalline Ho3+/Tm3+/Yb3+co-doped CaWO4 upconversion (UC) phosphors were successfully synthesized by a modified citrate complex method using microwave irradiation. The citrate complex precursors were heat-treated at temperature ranging from 300 to 700 °C for 3 h. Crystallization of the Ho3+/Tm3+/Yb3+co-doped CaWO4 was detected at 400 °C, and entirely completed at 600 °C. The Ho3+/Tm3+/Yb3+ co-doped CaWO4 heat-treated at 600 °C showed primarily spherical and homogeneous morphology. Under the laser excitation of 980 nm, Ho3+/Tm3+/Yb3+ co-doped CaWO4 shows the bright white upconversion (UC) emission visible to the naked eye, which is composed of a blue emission at 475 nm from Tm3+, and green and red emissions at 543 and 651 nm respectively from Ho3+. The coordinates of Ho3+/Tm3+/Yb3+ co-doped CaWO4 in the Commission International De’eclairage (CIE) chromaticity diagram could be controlled from a cool to a warm white color depending on the Tm3+and Ho3+concentrations. The UC luminescent properties on Tm3+and Ho3+concentrations and related mechanism based on laser pump power were discussed in detail.