Effects of Er3+ concentration on the structure and optical properties of the MgAl2O4/MgO/Sr3Al2O6/SrAl2O4 mixed phases prepared by the citrate sol gel method | Zendy

C. Dlamini | Zendy; M.R. Mhlongo | Zendy; L.F. Koao | Zendy; Tshwafo E. Motaung | Zendy; T.T. Hlatshwayo | Zendy; Y. Dwivedi | Zendy; S.V. Motloung | Zendy

Open Access

Effects of Er³⁺ concentration on the structure and optical properties of the MgAl₂O₄/MgO/Sr₃Al₂O₆/SrAl₂O₄ mixed phases prepared by the citrate sol gel method

Author(s) -

C. Dlamini,

M.R. Mhlongo,

L.F. Koao,

Tshwafo E. Motaung,

T.T. Hlatshwayo,

Y. Dwivedi,

S.V. Motloung

Publication year - 2020

Publication title -

materials research express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.383

H-Index - 35

ISSN - 2053-1591

DOI - 10.1088/2053-1591/abbd04

Subject(s) - monoclinic crystal system , analytical chemistry (journal) , transmission electron microscopy , scanning electron microscope , materials science , luminescence , doping , absorption (acoustics) , crystallography , ion , powder diffraction , mineralogy , nuclear chemistry , crystal structure , chemistry , nanotechnology , optoelectronics , organic chemistry , chromatography , composite material

The mixed phases of the un-doped MgAl 2 O 4 /MgO/Sr 3 Al 2 O 6 /SrAl 2 O 4 (MMSS), MgAl 2 O 4 /MgO (MM) Sr 3 Al 2 O 6 /SrAl 2 O 4 (SS), and the doped MMSS:x% Er 3+ (0 ≤ x ≤ 1.8) nanopowders were synthesized using the citrate sol-gel method. The effect of Er 3+ concentration on the structure, morphology and optical properties were investigated. X-ray powder diffraction (XRD) analysis indicated the cubical MgAl 2 O 4 , MgO and Sr 3 Al 2 O 6 ; and monoclinic SrAl 2 O 4 phases. The scanning electron microscopic images revealed the transformation of irregular particles to rod-like structure with an increase in Er 3+ concentration. Transmission electron microscope indicated the nanosized particles depends on Er 3+ concentration. Severals distinct absorption bands located at 444, 546, 653 and 704 nm under UV excitation (285 nm) corresponding to the defects states of the MgAl 2 O 4 , MgO, SrAl 2 O 4 , and Sr 3 Al 2 O 6 phases were observed. There were traces of emission peaks at 546 and 653 nm attributed to the 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ ion. An exponential decrease in luminescence was observed with an increase in Er 3+ concentration.

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