Influence of alkali metal compound fluxes on Gd2O2S:Tb particle and luminescence

Abstract

Gd 2 O 2 S:Tb phosphors with different alkalimetal compound fluxes were synthesized by molten salt method, showing high luminous intensity, monodispersity and micron size characteristics. The results indicated that from K ? to Na ? and to Li ? , the particles mean size tended to grow bigger. K ? could effectively reduce the particle size without depressing the luminescence intensity. Meanwhile, after comparing the strongest emission intensity among different fluxes, it was shown that K ? had most significance on improving the luminescence intensity. Li ? could promote the formation of hexagonal morphology. It was also found that CO 3 2-, PO 4 3-had prominent effects on optimizing particles size (at 254 nm excitation).

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

“…32,33 Also, Li 2 O or Li + is a typical network modifying agent, contributing to structural densification. [34][35][36][37] The reaction between the dopant and the matrix phase is studied and results show that the mechanism is exactly the same in all cases. Compared with Cs + , Li + is an intermediate cation with a stronger electric field intensity in glass-ceramics system.…”

Influence of different ligands on luminescence intensity and emission color of Dy(Lc)3phen(Lc = AA, MAA, BA, SA)

“…Meanwhile, the presence of carboxylate groups in the dysprosium organic complexes was confirmed by both the asymmetric vibration absorption peak (t asCOO-) at about 1597-1578 cm -1 and the symmetry vibration absorption peak (t sCOO-) at about 1429-1417 cm -1 . These experimental results showed that the carbonyl groups of carboxylic acid ligands were coordinated with the dysprosium ions [20]. In addition, the vibration absorption peak of C-H near 728 cm -1 of 1,10-phenanthroline shifted to lower wave number near 717-662 cm -1 .…”

Multi stimuli‐responsive HPC‐PAA/Eu(AA)3Phen complex nanogels and their decoration with 3‐APBA for detecting glucose

“…The characteristic absorption peaks of phenanthroline and AA still exist in Eu(AA) 3 Phen; however, the absorption peak at 1699 cm −1 of CC disappears, and new absorption peaks around 1723, 1638, and 1429 cm −1 are detected, which are characteristic absorption peaks of CO bonds and COO groups, respectively. According to the relevant literature, 18 the absorption of these characteristic peaks is caused by the coordination of the carbonyl group of acrylic acid with the europium ion. Moreover, the peak of CN stretching absorption of Phen is red‐shifted from 1587 to 1576 cm −1 , indicating that nitrogen atoms in the Phen molecule also participate in coordination 19 .…”