Charging Gd3Ga5O12:Pr3+ persistent phosphor using blue lasers

Recent advances in Pr3+-activated persistent phosphors

“…For example, in the Gd 3 Ga 5 O 12 :Pr 3+ phosphor, although Pr 3+ reaches the 4f5d level by subsequently absorbing two 450 nm (laser) excitation photons and the excitation energy is stored by electron trapping centers around the delocalized 4f5d state, as shown in Fig. 7a, 102 no UV PersL emission is observed directly from the 4f5d excited state. Instead, the phosphor exhibited visible PersL from 3 P 1 , 3 P 0 and 1 D 2 levels of Pr 3+ (Fig.…”

Up-conversion charging of a Tb3+-activated garnet phosphor

“…Up-conversion charging (UCC) is an alternative approach for charging persistent phosphors upon visible or infrared illumination. 24–30 In a typical UCC process for phosphors, the electron traps are filled via a two-step ionization of the activator. So far UCC has been achieved in Cr 3+ , Mn 2+ and Pr 3+ -activated phosphors.…”

“…So far UCC has been achieved in Cr 3+ , Mn 2+ and Pr 3+ -activated phosphors. 23–30 According to the electronic structure and energy-level scheme, Tb 3+ is also a potential activator ion for achieving the UCC process. In an appropriate phosphor, the Tb 3+ ion has a tendency to oxidize and its 5 D 4 state acts as an intermediate state to promote the up-conversion excitation process.…”

Multi-responsive deep-ultraviolet emission in praseodymium-doped phosphors for microbial sterilization

“…To develop new options, various inorganic UV phosphors were intensively investigated in the past few years, whereas studies on downshift luminescence are in the majority. Several recent studies turn to the UV long persistent luminescence (PersL), upconversion luminescence (UCL) and up-conversion charging (UCC) PersL [10,11]. For example, Pan and co-workers [3,12] developed new solar-blind UVC long persistent phosphors (LPP) and applied them to persistent tags.…”