Ce³⁺/Pr³⁺: YAGG: A Long Persistent Phosphor Activated by Blue‐Light

Abstract

The requirement of using ultraviolet light to stimulate afterglow luminescence has seriously restricted indoors/outdoors applications of most persistent materials developed hitherto. Herein, efficient blue‐light‐activated Ce3+, Pr3+: YAGG phosphors, showing optimized long‐persistent luminescence lasting for 1 h, were prepared and investigated in detail with the aid of X‐ray diffraction refinement, steady‐state/persistent photoluminescence spectra, room/low‐temperature persistent decay curves, and three‐dimensional thermo‐luminescence spectra. Notably, the afterglow properties were found highly dependent on the Ga content which greatly alters both the host band gap energy and the Ce3+: 5d level structure and thus is beneficial to the electrons' photoionization and trapping processes. Moreover, Pr3+ additive was found not only prolonged the afterglow lifetime of Ce3+ through improving concentration of carriers captured at the trap, but also served as the red‐emissive centers for color tuning. The persistent energy transfer from Ce3+ to Pr3+ was experimentally demonstrated for the first time.

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

“…12. Previously reports on the persistent luminescence of YAG: Ce also confirms the existence of crystal defects4243. The decrease in the intensity of TSL suggests the decrease of the concentration of crystal defects; and the shift of TLS peak from high to low temperature indicates the decrease of the trap depth.…”

Counting the Photons: Determining the Absolute Storage Capacity of Persistent Phosphors

“…This green emitting phosphor shows afterglow for several hours after the excitation has stopped, and has been extensively investigated [3,4,5]. Two decades after the discovery by Matsuzawa et al, the list of afterglow phosphors has grown, and in addition to the alkaline earth aluminates it now also includes, among others, silicates and sulfides doped with a wide variety of activators, such as Eu${}^{2+}$ [6], Ce${}^{3+}$ [7,8] or transition metal ions [9]. An important class of these materials are the red- and infrared-emitting persistent phosphors, which are quite scarce compared to other classes, but are highly desired in diverse applications, such as bioimaging and safety signage.…”

Multiple‐response anti‐counterfeiting realized in CaYAl3O7 host with the dual coexistence of Eu2+/Eu3+

“…Thus, the temperature‐dependent intensity of LPL was employed to identify the distribution of traps indirectly for the restriction of measurement range of our instrument below room temperature. Additionally, the LPL luminous intensity reaches maximum at the peak of the TL curve was demonstrated in previous reports . Thus, the TL curve of CYA: Eu and CYA: Eu, Nd is obtained by fitting the intensity of LPL measured at different temperature below 300 K as shown in Figure C,D, respectively.…”