Thermoluminescent and stuctural properties of BaAl2O4:Eu2+,Nd3+,Gd3+phosphors prepared by combustion method

Sivaramaiah²,

et al. 2019

Bull Mater Sci

A BaAl 2 O 4 :Gd 3+ phosphor was successfully prepared using a combustion technique. An X-ray diffraction pattern was used to characterize the resultant phosphor, and the photoluminescence (PL) of the prepared BaAl 2 O 4 :Gd 3+ was studied. Under a 273-nm excitation, the main emission peak of the phosphor is located at 314 nm, and this is attributed to the 6 P 7/2 → 8 S 7/2 transition of Gd 3+. Electron paramagnetic resonance (EPR) spectrum appears to be U-shaped, and lines are evident at g eff ∼ 2.14, 4.56 and 6.75. The PL and EPR analyses indicate the presence of Gd as Gd 3+ in this sample.

Section: Introductionmentioning

confidence: 64%

Ultraviolet B emission from a $$\hbox {Gd}^{3+}$$ Gd 3 + -doped $$\hbox {BaAl}_{2}\hbox {O}_{4}$$

Sivaramaiah²,

et al. 2019

Bull Mater Sci

“…Stuffed tridymite-type oxides AEAl 2 O 4 (AE = Sr, Ba) have attracted increasing attention in recent years as promising luminescent materials with a long afterglow [1][2][3] and ferroelectric properties. They consist of a flexible AlO 4 -tetrahedral framework that forms channels occupied by the AE ions.…”

Section: Introductionmentioning

confidence: 99%

Structural changes and microstructures in stuffed tridymite-type compounds Ba₁₋_xSr_xAl₂O₄

Tanaka

Ishii

Tsukasaki

et al. 2014

Jpn. J. Appl. Phys.

Crystal structures and microstructures in Ba 1%x Sr x Al 2 O 4 solid solutions between the end members of BaAl 2 O 4 and SrAl 2 O 4 have been carefully investigated by powder X-ray diffraction, electron diffraction and transmission electron microscopy (TEM) imaging experiments. With the help of fast Fourier transform (FFT) calculation, high-resolution TEM images suggested that diffuse streaks along three equivalent o110p directions in the (001) plane, which appear in the P6 3 structure of Ba 1%x Sr x Al 2 O 4 for x = 0.4, originate from the large structural fluctuation of the AlO 4 tetrahedral network. On the other hand, the monoclinic P2 1 structure in Ba 1%x Sr x Al 2 O 4 with x = 0.7 was found to consist of a modulated structure with q ¼ 0; 1=2; 0. The present experimental results reveal that a structural phase boundary exists at approximately x = 0.6 between the P6 3 structure with a large structural fluctuation and a monoclinic P2 1 phase with the single-q modulated structure.

Photostimulated luminescence properties of Eu²⁺‐doped barium aluminate phosphor

Qiu²,

et al. 2014

Luminescence

An intense green photostimulated luminescence in BaAl2 O4 :Eu(2+) phosphor was prepared. The thermoluminescence results indicate that there are at least three types of traps (T1 , T2 , T3 ) with different trap depths in BaAl2 O4 :Eu(2+) phosphor according to the bands located at 327, 361 and 555 K, respectively, which are closely associated with the phosphor's long persistent luminescence and photostimulated luminescence properties. In addition, as a novel optical read-out form, a photostimulated persistent luminescence signal can be repeatedly obtained in BaAl2 O4 :Eu(2+) phosphor. This shows that re-trapping of the electron released from a deep trap plays an important role in photostimulated persistent luminescence.