Zhu Mengyao, Li Zhenhua, Li Xuecheng, Zhang Xueru, Wang Yuxiao, Hao Haoyue, Li Liang
School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zi Bo, 255000, People's Republic of China.
Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
Sci Rep. 2024 Mar 26;14(1):7099. doi: 10.1038/s41598-024-57523-y.
Rare earth doped up-conversion luminescent nano-materials exhibit abundant emission colors under suitable excitation condition. In this work, NaYF:Er/Ho@NaYF and NaYbF:Tm@NaYF nanoparticles were synthesized by co-precipitation method. The pure red emission can be realized by the designed NaYF:Er/Ho@NaYF nanocrystals and the R/Gs reach 23.3 and 25 under excitations of 980 and 1550 nm lasers, respectively. The R/G declines as the power increasing with the emission color changing from red to yellow, which is due to the quick saturation of the energy levels, radiating red emissions. Meanwhile, the emission intensity of NaYbF:Tm@NaYF nanocrystals increases by 58.3 folds after encasing the inert shell NaYF and the CIE color coordinate reaches (0.1646, 0.0602) under 980 nm laser excitation. Furthermore, broad range multicolor from blue to red and yellow up-conversion emissions is achieved by mixing NaYF:Er/Ho@NaYF and NaYbF:Tm@NaYF nanocrystals, which could be applied to colorful displaying, security anti-counterfeiting and information coding.
稀土掺杂的上转换发光纳米材料在合适的激发条件下呈现出丰富的发射颜色。在本工作中，通过共沉淀法合成了NaYF:Er/Ho@NaYF和NaYbF:Tm@NaYF纳米颗粒。通过设计的NaYF:Er/Ho@NaYF纳米晶体可实现纯红色发射，在980和1550 nm激光激发下，R/G分别达到23.3和25。随着功率增加，R/G下降，发射颜色从红色变为黄色，这是由于辐射红色发射的能级快速饱和所致。同时，包裹惰性壳层NaYF后，NaYbF:Tm@NaYF纳米晶体的发射强度增加了58.3倍，在980 nm激光激发下CIE色坐标达到(0.1646, 0.0602)。此外，通过混合NaYF:Er/Ho@NaYF和NaYbF:Tm@NaYF纳米晶体实现了从蓝色到红色及黄色的宽范围多色上转换发射，可应用于彩色显示、安全防伪和信息编码。
