Ambient light stimulation enabling intense and long-lasting ultraviolet-C persistent luminescence from Pr³⁺-doped YBO₃ in bright environments

Abstract

Photostimulated luminescence (PSL) materials have attracted considerable attention in many important fields, varying from radiation dosimetry and biomedical imaging to security encryption and optical data storage. Nevertheless, monochromatic light illumination...

Insights into blue-light activated red-emitting persistent luminescence from Pr3+-doped phosphors

“…Generally speaking, the most suitable depth for the afterglow is 0.6–0.8 eV. 19,20,25 Accordingly, the depth distribution of the traps in the CCGGO:0.0015Pr 3+ sample is helpful for the RT afterglow luminescence. To obtain more information on the traps, the 3D-TL spectrum of the CCGGO:0.0015Pr 3+ sample was recorded after being irradiated with a 254 Hg lamp in the testing range of 480–700 nm, as shown in Fig.…”

“…Due to the similar ionic radii and valence state, Pr 3+ (coordination number (CN) = 8, r = 1.126 Å) tends to replace Ca 2+ (CN = 8, r = 1.12 Å) and Cd 2+ (CN = 8, r = 1.1 Å) in the CCGGO:0.0025Pr 3+ crystal structure. 11,22,25,32,33 It is to be noted that the radii difference percentage allowance between the doped and substituted ions must be within 30% according to the report of Davolos. 21,34 Moreover, we can calculate the radii difference percentage using the following equation: To study the morphology and grain size of the samples, typical SEM images of CCGGO:0.0015Pr 3+ were recorded as shown in Fig.…”

“…It is widely believed that the PersL is linked to the gradual release of charge carriers from the trapping centers owing to thermal stimulation. 25 In general, the persistent intensity and times are dominated by the depth and concentration of these traps. 25,43 Therefore, to further explore the afterglow behavior, TL curves of all the samples were investigated after irradiation using a UV lamp for 5 min at room temperature, as displayed in Fig.…”

“…25 In general, the persistent intensity and times are dominated by the depth and concentration of these traps. 25,43 Therefore, to further explore the afterglow behavior, TL curves of all the samples were investigated after irradiation using a UV lamp for 5 min at room temperature, as displayed in Fig. 7a.…”

“…4,[22][23][24] Pr 3+ is a prominent and excellent activator and can exhibit a strong red emission band at 613 nm attributed to the 1 D 2 → 3 H 4 transition of the Pr 3+ ion. [25][26][27] Hence, it is of great significance to develop a Pr 3+ -activated CaCd 2 Ga 2 Ge 3 O 12 : Pr 3+ red garnet material excitable by blue light.…”