A series of Mn 4+ doped K m La m Sr 2-2m MgTeO 6 phosphors and Mn 4+ , Bi 3+ co-doped phosphors were prepared by high-temperature solid-state reaction method. It is found that the non-luminous Sr 2 MgTeO 6 : Mn 4+ begins to glow when the Sr 2+ sites are partially replaced by K + and La 3+ ions. The K 0.5 La 0.5 SrMgTeO 6 : Mn 4+ phosphor gives the strongest emission peaking at 692 nm, in which half of the Sr 2+ ions are replaced by La 3+ and K + ions. The optimal doping concentration of Mn 4+ in K 0.5 La 0.5 SrMgTeO 6 is 0.7% in mole. As the concentration of Mn 4+ continues to increase, the dipole-dipole interaction-induced luminescence concentration quenching occurs. Moreover, the emission intensity of the phosphor can be further increased by 69% when co-doping Bi 3+ with a concentration of 1% in a mole. The properties of the developed phosphor indicate that it has potential application prospects in plant growth LED.

Ni2+, Er3+, Nb5+ tri-doped Y2Mg3Ge3O12 phosphors have been fabricated by conventional solid-phase reaction method. Near infrared light in the wavelength range of 900–1700 nm can be up-converted by the phosphors...

Near-infrared emission material, C e 3 + , E r 3 + co-doped C a 1.5 Y 1.5 A l 3.5 S i 1.5 O 12 has been synthesized via a high-temperature solid-state reaction method. The luminescence intensity of 1532 nm emission excited with 455 nm increases 4.2 times after the introduction of C e 3 + ions because of C e 3 + → E r 3 + radiation-reabsorption energy transfer and nonradiative energy transfer sensitization as well as the 4 I 11 / 2 ( E r 3 + ) + 2 F 5 / 2 ( C e 3 + ) → 4 I 13 / 2 ( E r 3 + ) + C e 3 + ( 2 F 7 / 2 ) cross relaxation between C e 3 + and E r 3 + ions. The result shows that the developed material is convenient to obtain high-efficiency, near-infrared emission using a commercial blue GaN LED as a pumping source.

ANSYS/LS-DYNA dynamic analysis software was adopted to establish a model of a grid structure impacted by a landslide load, with the dynamic effects of impact loads and contact collision theory considered based on Hamilton’s principle. The case analysis in this study can provide guidance for anti-slump design in similar projects.

A series of Mn4+, Nd3+ codoped K0.5La0.5SrMgWO6 phosphors have been prepared by high‐temperature solid‐state reaction method. Under 468 nm excitation, near infrared emission bands centered at around 910 and 1064 nm are observed, assigned to the 4F3/2→4I9/2 and 4F3/2→4I11/2 transitions of Nd3+, respectively. The similarity between the excitation spectra in the 300–550 nm monitored at Mn4+ 697 nm emission and those monitored at Nd3+ 1064 nm emission as well as the lifetime shortening of Mn4+ emission with Nd3+ concentration increasing prove that the occurrence of the energy transfer sensitization from Mn4+ to Nd3+. In terms of the analysis results based on Dexter's theory and Inokuti‐Horayama model, it is believed that the dipole–dipole interaction plays a key role in the energy transfer process.