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Tunable Luminescence of Ce3+-Doped Calcium Boroaluminate Glasses for Light Emitting Devices
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Journal Article
Tunable Luminescence of Ce3+-Doped Calcium Boroaluminate Glasses for Light Emitting Devices
2021
Overview
In this work, the visible luminescence of Ce
3+
-doped calcium boroaluminate glasses (CaBAl) was studied. Samples of CaBAl glass with composition (30.97-
x
)CaO-49.90B
2
O
3
-10.22Al
2
O
3
-8.90CaF
2
-
x
CeO
2
, with values of
x
varying from 0.25 to 1.25 mol.%, were prepared by the conventional melt-quenching technique, adding carbon as a reducing agent. The samples studied had amorphous nature confirmed by the results of X-ray diffraction (XRD). The Fourier transform infrared (FTIR) results showed that the vitreous network is formed by BO
3
and BO
4
structures, and the calculated values of the fraction of BO
4
groups (
N
4
) revealed that the increment of cerium favored the conversion of BO
3
to BO
4
. The optical absorption spectra presented an intense broad band assigned to a charge transfer of the Ce
4+
, with a shift of ultraviolet (UV) absorption edge to longer wavelength, and a decrease in the band gap as result of the CeO
2
concentration increase. The photoluminescence excitation (PLE) spectra showed that Ce
3+
-doped CaBAl glasses can be excited in a wide range of the UV spectral region (320-405 nm). The luminescence band of Ce
3+
transitions 5d
1
→
2
F
5/2
,
2
F
7/2
was observed with different maximum in the emission bands for different excitation wavelengths, originate from Ce
3+
ions placed mainly in two different sites in the glass network, resulting in distinct band positions and symmetries. The International Commission on Illumination (CIE) diagram demonstrated that the emission of samples occurs in the blue region. The lifetime decreased with increasing CeO
2
concentration (47 to 34 ns) from 1.25 to 0.25 mol.% of CeO
2
. The results suggest that the studied glasses have potential for applications in optical devices such as LEDs and phosphors.
Publisher
Springer US,Springer Nature B.V
