Self-reduction-induced BaMgP₂O₇:Eu^2+/3+: a multi-stimuli-responsive phosphor for X-ray detection, anti-counterfeiting and optical thermometry

Abstract

Mixed-valence Eu2+/3+ activated phosphors are attracting wild attention due to their excellent luminescence tunability. Steady control of the Eu2+/Eu3+ ratio is the key to achieving reproducible Eu2+/3+ co-doped materials. In...

Achieving highly thermostable red emission in singly Mn2+-doped BaXP2O7 (X = Mg/Zn) via self-reduction

“…To achieve the charge state transformation, defects should be generated to accomplish this process. 41 As seen in Fig. 7, the representative BZPO:0.20Mn 2+ and BMPO:0.20Mn 2+ present strong thermoluminescence (TL) on heating.…”

Unusual magnetic behavior of TiO2-doped CuFeO2 crystals (CuFe1−xTixO2) grown by the optical floating zone method

“…At higher Ti doping levels, the unit cell expands, which is suggestive of the reduction of Ti 4+ to the larger Ti 3+ . Based on a charge compensation model, 31,32 Ti 4+ ions in CFO will replace Fe 3+ ions in a 3 : 4 ratio with one negatively charged metal cation vacancy and three positively charged defects being generated in adjacent locations. Furthermore, negatively charged vacancies can provide electrons to positively charged defects, and result in the reduction of Ti 4+ ions to Ti 3+ .…”

Multi-mode anti-counterfeiting guarantees from a single material CaCd2Ga2Ge3O12:Tb3+,Yb3+ – two stimuli-responsive and four-state emission

“…[3][4][5] For this purpose, a range of luminescence anti-counterfeiting materials have been extensively used in anti-counterfeit technologies due to their excellent characteristics, such as long lifetime, inconspicuousness, and narrow band emission. [6][7][8][9][10] Compared with single-mode luminescence, multi-mode luminescence anti-counterfeiting can achieve luminescence under different excitation conditions, which improves the development of luminescence anti-counterfeiting. [11][12][13] A variety of advanced multi-mode anticounterfeiting applications have been studied so far.…”