NaGdF:Dy nanocrystals: new insights into optical properties and energy transfer processes.

NaGdF:Dy nanocrystals (NCs) have been synthesized using a precipitation technique. The structural characteristics and morphology of the materials were analyzed using X-ray diffraction patterns and scanning electron microscopy images, respectively. The photoluminescence excitation spectra, emission spectra and decay curves of all samples were recorded at room temperature.

Reduction Mechanisms of Cu-Doped NaO-AlO-SiO Glasses during Heating in H Gas.

Controlling valence state of metal ions that are doped in materials has been widely applied for turning optical properties. Even though hydrogen has been proven effective to reduce metal ions because of its strong reducing capability, few comprehensive studies focus on practical applications because of the low diffusion rate of hydrogen in solids and the limited reaction near sample surfaces. Here, we investigated the reactions of hydrogen with Cu-doped NaO-AlO-SiO glass and found that a completely different reduction from results reported so far occurs, which is dominated by the Al/Na concentration ratio.

Photoluminescence and thermoluminescence characteristics of Sr3 B2 O6 :Eu(2+) yellow phosphor.

Sr3 B2 O6 :Eu(2+) yellow phosphor was prepared by the combustion method. The crystalline structure, photoluminescence and thermoluminescence properties of Sr3 B2 O6 :Eu(2+) were investigated extensively. The X-ray diffraction result indicates that the Sr3 B2 O6 :Eu(2+) phosphor exhibited a rhombohedral crystal structure.