Synthesis, characterization of an AlPO-CJ₂analogue containing heteroatomic Eu

Abstract

An analogue of AlPO-CJ2 microporous aluminophosphate containing heteroatomic Eu was hydrothermally synthesized in situ in the reactant system of carbamide-NH4-F-Al2O3-P2O5-H2O, and characterization by ICP, powder XRD, Mössbauer spectra, 31P MAS NMR and luminescent spectroscopy prove that Eu is incorporated into the framework.

Carbon Dots‐in‐EuAPO‐5 Zeolite: Triple‐Emission for Multilevel Luminescence Anti‐Counterfeiting

“…According to the previous reports, the replacement of Al 3+ in zeolite framework by Eu 3+ can cause the shift of 31 P MASNMR peak. [29] Furthermore, ICP results give that the Al/P ratios of pure AlPO 4 -5 zeolite and (Al+Eu)/P ratio of CDs@EuAPO-5 composite are nearly, 0.96 and 0.97, respectively, which further confirms the replacement of Al 3+ of zeolite framework by Eu 3+ . [29] It is worth mentioning that the CDs@EuAPO-5 composite only displays a low total quantum yield (QY) of 5%, which is because we decrease the crystallization temperature to achieve the meanwhile strong emissions of CDs and Eu 3+ .…”

“…[29] Furthermore, ICP results give that the Al/P ratios of pure AlPO 4 -5 zeolite and (Al+Eu)/P ratio of CDs@EuAPO-5 composite are nearly, 0.96 and 0.97, respectively, which further confirms the replacement of Al 3+ of zeolite framework by Eu 3+ . [29] It is worth mentioning that the CDs@EuAPO-5 composite only displays a low total quantum yield (QY) of 5%, which is because we decrease the crystallization temperature to achieve the meanwhile strong emissions of CDs and Eu 3+ . If we increase the crystallization temperature, the fluorescence emission of CDs will further strengthen, and the QY should be greatly improved, [41] but the fluorescence emission of Eu 3+ will weaken (Figure S10, Supporting Information), making it difficult to realize triple emissions in a single composite.…”

“…Previous studies have demonstrated that Eu 3+ can enter the framework of aluminophosphates by replacing Al 3+ . [25][26][27][28][29] To prove this, a series of experiments and characterizations were carried out. Fluorescence emission and excitation spectra of EuCl 3 aqueous solution were measured (Figure S5, Supporting Information).…”

“…More importantly, studies have demonstrated that Eu 3+ can enter the framework of aluminophosphate materials by substituting framework Al atoms to form red phosphors. [25][26][27][28][29] In this work, Eu 3+ is introduced into AlPO 4 -5 zeolite along with CDs by an in situ solvent-free thermal crystallization method. The prepared CDs@EuAPO-5 composite shows triple emissions trigged by two simple excitation lights, which includes pink fluorescence mainly associated with Eu 3+ , blue fluorescence and green RTP associated with CDs.…”

Preparation and its luminescent properties of AlPO4:Eu3+ phosphor for w-LED applications

“…: +86 0312 5079423; fax: +86 0312 5011174. AlPO 4 -CJ 2 [12]. Yan et al reported the substitution of rare earth (RE) elements (Eu, Ce, Tb) on the large-pore aluminophosphate and mesoporous aluminophosphate [13].…”