Structural-microstructural characterization and optical properties of Eu3+, Tb3+-codoped LaPO4·nH2O and LaPO4 nanorods hydrothermally synthesized with microwaves. Issue 11 (1st August 2018)

• Record Type: Journal Article
• Authors: Colomer, María T.; Zur, Lidia; Ferrari, Maurizio; Ortiz, Angel L.
• Is Part Of: Ceramics international. Volume 44:Issue 11(2018)
• Page Start: 11993
• Page End: 12001
• Publication Date: 2018-08-01
• Subjects: A. Processing: Microwave processing -- C. Properties: Optical properties -- E. Applications: Functional applications -- Powders: Chemical preparation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.03.142
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Rhabdophane-type Eu 3+, Tb 3+ -codoped LaPO4 · n H2 O single-crystal nanorods with the compositions La0.99999- x Eu x Tb0.00001 PO4 · n H2 O ( x = 0–0.03), La0 .99999- y Tb y Eu0.00001 PO4 · n ′H2 O ( y = 0–0.010), and La0.99999- z Tb z Eu0.000007 PO4 · n ′′H2 O (z = 0–0.012) were hydrothermally synthesized with microwaves. It is shown that the Eu 3+, Tb 3+ codoping does not affect the thermal stability of these nanorods, which is due to the formation of substitutional solid solutions with both Eu 3+ and Tb 3+ replacing La 3+ in the crystal lattice. Moreover, it is also shown that monazite-type Eu 3+, Tb 3+ -codoped LaPO4 single-crystal nanorods can be obtained by calcining their rhabdophane-type Eu 3+, Tb 3+ -codoped LaPO4 ·( n, n′ or n′′ )H2 O counterparts at moderate temperature in air, and that they are thermally stable. It is also observed that, for the same Eu 3+, Tb 3+ -codoping content, the monazite-type Eu 3+, Tb 3+ -codoped LaPO4 nanorods exhibit higher photoluminescent efficiency than the rhabdophane-type Eu 3+, Tb 3+ -codoped LaPO4 · ( n, n′ or n′′ )H2 O nanorods. Moreover, it is found that the highest photoluminescence emission corresponds to the monazite-type La0.96999 Eu0.02 Tb0.00001 PO4 nanorods for the La0 .99999- x Eu x Tb0.00001 PO4 system. However, for those compositions energy transfer from Tb 3+ to Eu 3+ does not occur. In addition, for an efficient energy transfer to occur, a content of at least 1 mol% Tb 3+ is needed in all the studied materials. Graphical abstract: fx1