## 1 Introduction  
When a material absorbs external excitation energy, such as light, electric fields, or electron beams, if it does not undergo chemical changes, it returns to its original equilibrium state; however, in this process, excess energy is emitted in the form of light, which is luminescence [1; 2]. Luminescence is an ancient and mysterious phenomenon. With the passage of time, it has gradually entered people's vision and been deeply studied. Long persistent luminescence (LPL) refers to a phenomenon whereby luminescent materials can continue to emit light after excitation is halted, which plays an important role in the biological, medical, military, and anti-counterfeiting industries [3; 4; 5; 6]. LPL materials can be divided into excessive metal-ion-doped luminescent materials (Cr\({}^{3+}\), Mn\({}^{2+}\), Mn\({}^{4+}\), and Ni\({}^{2+}\)), \(S^{2}\) electronic structure ion-doped luminescent materials (Bi\({}^{3+}\) and Pb\({}^{2+}\)), rare-earth metal-ion-doped luminescent materials (Eu\({}^{2+}\), Eu\({}^{3+}\), Ce\({}^{3+}\), Sm\({}^{3+}\), Tb\({}^{3+}\), Dy\({}^{3+}\), Er\({}^{3+}\), Yb\({}^{3+}\), Nd\({}^{3+}\), Pr\({}^{3+}\), Ho\({}^{3+}\), and Tm\({}^{3+}\)) and others, according to the luminescent center [5; 6; 7; 8; 9]. There are also excessive metal-ion-doped luminescent materials; for example, in the Ga\({}_{2}\)O\({}_{3}\) matrix, Cr\({}^{3+}\) produces a sharp line emission near 700 nm due to the energy level transition of \({}^{2}\)E \(\rightarrow\)\({}^{4}\)A\({}_{2}\). In the La\({}_{3}\)Ga\({}_{5}\)GeO\({}_{14}\) matrix, Cr\({}^{3+}\) has a broadband emission at 650-1000 nm due to the \({}^{4}\)T\({}_{2}\)\(\rightarrow\)\({}^{4}\)A\({}_{2}\) transition. \(S^{2}\) electronic structure ion-doped luminescent materials, for example, ZnS:Cu\({}^{+}\), can emit yellow persistent luminescence near 530 nm for more than 1 h after excitation. The blue persistent luminescence of CdSiO\({}_{3}\):In\({}^{3+}\) at 435 nmafter excitation can be more than 2 h. MgAl\({}_{2}\)O\({}_{4}\):V\({}^{3+}\) emits yellow persistent luminescence around 520 nm after excitation for more than 1 h. Rare-earth metal-ion-doped luminescent materials are one of the earliest forms of long-afterglow luminescence; particularly, in 1996, [PERSON] realized SrAl\({}_{2}\)O\({}_{4}\): Eu\({}^{2+}\) and Dy\({}^{3+}\) emit green LPL after 20 h by co-doping Dy\({}^{3+}\). Due to the variety of rare-earth ions and the variety of preparation methods, the luminescent color, luminescent intensity, and luminescent properties of these rare-earth metal-ion-doped luminescent materials are also varied, and these their preparation method is mature, with excellent performance. Praseodymium ion, as a rare earth ion in luminescent materials because of its unique energy level characteristics, is also of great significance. Pr\({}^{3+}\) can produce a variety of emissions in different matrix materials with varying emission properties, and an emission wavelength that can be extended from the ultraviolet (UV) to the infrared region, attracting significant academic interest [10; 11; 12; 13; 14; 15; 16]. Recently, a significant number of Pr\({}^{3+}\)-doped phosphors, scintillators, and LPL materials have been reported [10; 11; 12; 13; 14; 15; 16]. [PERSON] et al. prepared a Sr\({}_{3}\)TaAl\({}_{3}\)Si\({}_{2}\)O\({}_{14}\):Pr\({}^{3+}\) blue-green LPL material using a high-temperature solid-state method. The photoluminescence emission coincided with the persistent luminescence emission spectrum. The emission peak at 489 nm corresponds to the \({}^{3}\)P\({}_{0}\)\(\rightarrow\)\({}^{3}\)H\({}_{4}\) transition of Pr\({}^{3+}\), and it has a long persistence time above 900 s [10]. In the same year, they reported that the emission peaks of a Sr\({}_{2}\)Ta\({}_{2}\)O\({}_{7}\):Pr\({}^{3+}\) blue LPL luminescent sample at 486 and 498 nm were attributed to the \({}^{3}\)P\({}_{0}\)\(\rightarrow\)\({}^{3}\)H\({}_{4}\) transition, and the LPL decay time was determined to be \(>\)1200 s [11].