Hydrothermal synthesis and up-conversion luminescence properties of NaYF4:Yb3+,Tm3+ phosphors

Simultaneous enhancement of upconversion luminescence and photoelectric effect in NaYF4:Yb3+/Tm3+/Zr4+ tri-doped microcrystals

“…The UV emissions around 345 nm and 362 nm are attributed to the transition of Tm 3+ : 1 I 6 → 3 F 4 , 1 D 2 → 3 H 6 respectively, and the blue emissions centered at 450 nm and 473 nm are attributed to the transitions of Tm 3+ : 1 D 2 → 3 F 4 , 1 G 4 → 3 H 6 . The red emissions centered at 643 nm are attributed to the transition of Tm 3+ : 1 G 4 → 3 F 4 , and the NIR emissions around 797 nm are attributed to the transition of Tm 3+ : 3 H 4 → 3 H 6 [24].…”

Parameter optimization of the MQL nozzle by the computational fluid dynamics

“…The orthogonal experimental is a multi-factor experimental method based on the orthogonal array [24], and the representative experiments which can represent the overall situation are selected from the full factor tests [25]. In addition, the orthogonal experiment can reduce the test workload and cost [26], and it is very simple and effective for the multi-factor test with optimal parameter combination [27]. Thus, the orthogonal experiment of L25 (56) which had six factors and five levels was designed, as shown in Table 1 and Table 2, so as to draw the nozzle model, as shown in Fig.…”