In this study, TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles had been successfully prepared via a hydrothermal process. All the as-prepared TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles showed the blue (476 nm), green (525 nm, 545 nm) and red (667 nm) emissions under 980 nm excitation, which were attributed to the 1 G 4 → 3 H 6 (Tm 3+ ), 2 H 11/2 , 4 S 3/2 → 4 I 15/2 (Er 3+ ) and 4 F 9/2 → 4 I 15/2 (Er 3+ ) transitions, respectively. The decay lifetime of blue, green and red emissions were 40 μs, 46 μs and 89 μs, respectively. The combination of blue, green and red emissions resulted in the white luminescence which was intense and visible to the naked eyes. The calculated CIE color coordinates of TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles fell well within the white region and changed little with the incident pump power from 1.75 W/cm 2 to 16.13 W/cm 2 , which indicated that the materials may have potential applications in the fields of three dimensional displays, back lighting, white light sources, and so on.
Graphical The high-temperature thermal decomposition (HTD) of ammonium perchlorate (AP) is decreased by 104.4 °C if the TeO 2 nanoparticle/graphitic carbon nitride (g-C 3 N 4 ) hybrids are added to AP. Furthermore, a Lewis acid–base interaction catalytic mechanism is proposed to illustrate the thermal decomposition of AP; CB = conduction band, VB = valence band, h + = hole, LTD = low-temperature thermal decomposition. TeO 2 nanoparticle-loaded graphitic carbon nitride hybrids (TeO 2 NPs/g-C 3 N 4 ) were successfully prepared by a calcination strategy. Various characterization and detection techniques were used to analyze its structure and properties. It was found that upon the addition of 10 wt.-% of the as-prepared hybrids, the onset decomposition temperature of ammonium perchlorate (AP) decreased by 104.4 °C. In addition, the addition of TeO 2 NPs resulted in an increase in the surface area up to 8.8 m 2 g –1 for g-C 3 N 4 , which is three times larger than that of the bulk g-C 3 N 4 (2.8 m 2 g –1 ). Furthermore, g-C 3 N 4 reacted with HClO 4 by Lewis acid–base interaction, which resulted in separation of HClO 4 from AP lattice. Notably, the separation of the HClO 4 gas molecule led to continued decomposition of AP, as this decomposition reaction is reversible. With this in mind, a catalytic mechanism based on Lewis acid–base interaction was proposed to illustrate the catalytic process in the thermal decomposition of AP.
危险品化学品经营许可证（带存储）