Synthesis of CaMgSi₂O₆:Eu²⁺ phosphor with the polymerizable complex method and adding Li₂CO₃ flux

Abstract

In this study, blue-color emitting phosphors CaMgSi 2 O 6 :Eu 2+ (CMS:Eu 2+ ) were synthesized by the polymerizable complex method at 1000 °C in a reducing atmosphere. After the synthesis, the desired CMS crystals were obtained, but a small amount of impurity phases, such as Ca 2 MgSi 2 O 7 and Ca 3 MgSi 2 O 8 , were contained. By adding lithium carbonate Li 2 CO 3 as a flux to the polymerizable complex method and washing with 1 mol dm ¹3 HCl solution, the desired CMS:Eu 2+ was obtained in a single phase. The maximum luminescence intensity was obtained at a flux concentration of 8 mol % for the composition CaMgSi 2 O 6 when the amount of added flux was varied.

Controlling the europium oxidation state in diopside through flux concentration

“…The spectral shape generally agrees with those shown in previously published works. 23,24,43 The normalised emission (PL) spectra obtained for the CMS-H 2 -z, CMAS-H 2 -z, and CMAS-N 2 -z series of samples are presented in Fig. S6, S7 and S8, † respectively.…”

“…22,23 The solid-state synthesis of CaMgSi 2 O 6 is usually performed using a flux to obtain a single-phased, well-crystallized product. 18,19,[23][24][25][26][27][28][29] In this work, we describe the research conducted on the CaMgSi 2 O 6 matrix doped with europium and co-doped with aluminium ions to tune the oxidation states of europium in the material. The solid-state synthesis allowed us to obtain different series of CaMgSi 2 O 6 -based luminescent materials.…”

“…22,23 The solid-state synthesis of CaMgSi 2 O 6 is usually performed using a flux to obtain a single-phased, well-crystallized product. 18,19,23–29…”