Thermally stimulated luminescence of a natural layered double hydroxide

• Published in: Journal of thermal analysis and calorimetry Vol. 133; no. 3; pp. 1253 - 1257
• Main Authors: Correcher, V., Garcia-Guinea, J., Rodriguez-Lazcano, Y.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-09-2018; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Differential thermal analysis; Differential thermogravimetric analysis; Electron probe microanalysis; Electron probes; Emission analysis; Hydroxides; Infrared radiation; Inorganic Chemistry; Luminescence; Measurement Science and Instrumentation; Optical properties; Organic chemistry; Physical Chemistry; Polymer Sciences; Spectral emission; Thermogravimetry; Thermoluminescence; X ray fluorescence analysis; X-ray spectroscopy; Hydrotalcite-like minerals; Layered double hydroxide; Thermoluminescence
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7205-z

Layered double hydroxides (LDHs) and many of the related hydrotalcite-like minerals have been well studied from the chemical and structural point of view; however, their luminescence properties have been scarcely studied. We herein report on the thermoluminescence (TL) behaviour of a natural LDH (Mg
6
Cr
2
CO
3
(OH)
16
·4H
2
O), previously characterized by X-ray fluorescence, X-ray energy-dispersive spectrometry, electron probe microanalysis, thermogravimetry and differential thermal analysis, that exhibited a very complex green-IR spectral emission. The broad waveband peaked at ~ 640 nm can be mainly linked to the
4
T
1
 → 
6
A
1
(at 570 nm),
4
A
2g
 → 
2
E
g
(~ 685 nm),
4
T
1
 → 
6
A
1
(~ 700 nm), and
1
T
2g
 → 
3
A
2g
(green) and
1
T
2g
 → 
3
T
2g
(red) transitions due, respectively, to the presence of Mn
2+
, Cr
3+
, Fe
2+
and Ni
2+
. The weak red-TL emission can likely be attributed to the quenching effect due to Fe (~ 8–11%) ions substituting for Mg
2+
.