Cui Jingyu, Ren Liwei, Li Ying, Liu Shuai, Feng Li, Liu Yanhong, Wang Guofeng
J Nanosci Nanotechnol. 2014 May;14(5):3707-10. doi: 10.1166/jnn.2014.7986.
Tetragonal phase NaYW2O8:Yb3+/Ho3+ nanocrystals were successfully synthesized using a hydrothermal method with a subsequent calcination treatment. Under 980 nm excitation, the 5S2/5F4 --> 5I8 and 5F5 --> 5I8 emissions were observed. The relative intensity of the 5F5 --> 5I8 to the 5S2/5F4 -->5I8 in the samples increased with increasing the pH values of the resultant solutions. The CIE coordinates of the upconversion luminescence were (0.43, 0.54), (0.41, 0.55), (0.40, 0.56), (0.39, 0.54), (0.37, 0.49), (0.35, 0.44), and (0.33, 0.37) for the samples prepared at pH = 7, 8, 9, 10, 11, 13, and 14, respectively. In addition, the upconversion mechanism was also investigated.
采用水热法并随后进行煅烧处理，成功合成了四方相的NaYW2O8:Yb3+/Ho3+纳米晶体。在980 nm激发下，观察到了5S2/5F4→5I8和5F5→5I8发射。样品中5F5→5I8与5S2/5F4→5I8的相对强度随所得溶液pH值的增加而增加。对于在pH = 7、8、9、10、11、13和14制备的样品，上转换发光的CIE坐标分别为(0.43, 0.54)、(0.41, 0.55)、(0.40, 0.56)、(0.39, 0.54)、(0.37, 0.49)、(0.35, 0.44)和(0.33, 0.37)。此外，还对上转换机制进行了研究。
