Photostimulated luminescence properties of Eu²⁺‐doped barium aluminate phosphor

Abstract

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.

Crystal structure, photoluminescence and cathodoluminescence of Ba1-xCaxAl2O4 doped with Eu2+

“…This factor reflects the multiplicity ratio between the numbers of Ba 2+ ions in the two cation sites of ferroelectric BaAl 2 O 4 . The conclusion of Poort et al was largely confirmed by Stefani et al [19], although these latter authors measured the two bands in the PL spectrum of BaAl 2 O 4 :Eu 2+ ,Dy 3+ at λ 0 =435 nm and 500 nm Finally, He et al [20] measured a band at 419 nm in BaAl 2 O 4 :Eu 2+ . In the PL spectra reported herein bands at 435 nm and 419 nm were not observed.…”

“…By comparing the PL spectrum of BA (x Ca =0) in Fig. 7(a) with literature data some surprising differences are apparent regarding the presence or absence of a second emission band at 430 nm [9,[15][16][17][18][19][20][21][22]. These differences are represented in Table 2 as the ratio R, which is the spectral radiance at 430 nm divided by the spectral radiance at 500 nm.…”

Neutralizing the Charge Imbalance Problem in Eu3+-Activated BaAl2O4 Nanophosphors: Theoretical Insights and Experimental Validation Considering K+ Codoping

“…Hence, motivated by these favorable aspects, till now, various research groups have attempted to develop rare-earth-doped BaAl 2 O 4 nanophosphors using various synthesis protocols. There are quite a few such reports regarding Eu 2+ doping in BaAl 2 O 4 nanophosphors; ,,, however, reports of successful doping of Eu 3+ in a BaAl 2 O 4 matrix are remarkably sparse. Wiglusz et al had recently adopted a sol–gel method for developing Eu 3+ -doped BaAl 2 O 4 nanophosphors and investigated their structural changes and luminescence properties; however, the maximum photoluminescence (PL) brightness obtained by them is still not up to the mark and leaves much to be desired.…”

Facile production of smart superhydrophobic nanocomposite for wood coating towards long‐lasting glow‐in‐the‐dark photoluminescence

“…If the emission lingers, then this is afterglow phosphorescence that may continue for fractions of a second or even for a few seconds (phosphorescence) up to a few hours (long‐persisting photoluminescence). [ 4 ] Long‐lasting photoluminescence has been an important light‐responsive observable fact utilized in the fabrication of smart commodities with the ability to emit light in the dark after excitation with an external light source such as a UV device, [ 5 ] sunlight, or even visible indoor lighting. Long‐lasting luminescence has been used for different purposes such as safety signs, developed as paints or strips to lead the public to a secure place in emergencies such as fire or electricity blackout.…”

“…Long‐lasting luminescence has been used for different purposes such as safety signs, developed as paints or strips to lead the public to a secure place in emergencies such as fire or electricity blackout. [ 5–7 ] Long‐lasting luminescence can be attributed to the high capacity of a material to store light following irradiation with an excitation light source. This material continues to release the stored energy for extended time periods.…”