Effects of X-ray irradiation on the Eu3+ → Eu2+ conversion in CaAl2O4 phosphors

Correlating Structure and Luminescence Properties of Undoped and Eu3+-Doped La2Hf2O7 Nanoparticles Prepared with Different Coprecipitating pH Values through Experimental and Theoretical Studies

“…Rather, a small identifiable broad peak could be seen around 550 nm, which could be attributed to X-ray-induced conversion of some of the Eu 3+ ions to the divalent ion. Such a phenomenon is also observed in other hosts such as CaAl 2 O 4 and Sr 2 SiO 4 . , The RL spectral features of these NPs are similar to the PL ones (Figure a), consisting of the typical europium ion transition in the range of 580–740 nm with an intense red emission at 612 nm due to the 5 D 0 → 7 F 2 EDT and a MDT band at 592 nm due to the 5 D 0 → 7 F 1 transition. In addition to these, a very intense emission peak at 710 nm due to 5 D 0 → 7 F 4 transitions within the so-called “biological window” could be also detected.…”

Theoretical Calculation of Bond Energy, Self-Reduction Phenomenon, and Photoluminescence Properties of Eu/Ce Single-Doped and Codoped Ba2CaB2Si4O14 Phosphors

“…(4) The matrix has rigid structural characteristics, such as SiO 4 , AlO 4 , and BO 4 tetrahedral structure. At present, phosphate (Mg 3 Ca 3 (PO 4 ) 4 , Ba 3 (PO 4 ) 2 ), 17,18 silicate (BaZnSiO 4 , Ca 2 SiO 2 F 2 ), 19,20 borate (CaB 2 O 4 , BaB 2 Si 2 O 8 ), 21,22 and aluminate (BaMgAl 10 O 17 , CaAl 2 O 4 ) 23,24 have been found to realize the self-reduction from Eu 3+ to Eu 2+ in air. In fact, for the phenomenon of selfreduction in an air atmosphere, we can also consider the relationship between the bond length and chemical bond energy, and use a theoretical calculation method to analyze.…”

Valence regulation in europium-doped fluoride phosphor for high-resolution X-ray time-lapse imaging

“…[20][21][22][23][24][25] Therefore, the RPL materials (plan C) are proposed to achieve repeated time-lapse imaging via X-ray-induced valence regulation, which greatly resolves the short lifetime and instability properties of traditional X-ray time-lapse imaging materials. 26,27 Although RPL materials possess great potentials in X-rayrelated fields, 28,29 exploring the new RPL materials shows great difficulty due to the ambiguous RPL mechanism. Go OKADA suggested the following principles: First, the stable multivalence state should be one of the important aspects.…”

“…Although RPL materials possess great potentials in X-ray-related fields, 28,29 exploring the new RPL materials shows great difficulty due to the ambiguous RPL mechanism. Go OKADA suggested the following principles: First, the stable multi-valence state should be one of the important aspects.…”