Rb+-doped CsPbBr3 quantum dots with multi-color stabilized in borosilicate glass via crystallization

Rubidium Doping to Enhance Carrier Transport in CsPbBr3 Single Crystals for High-Performance X-Ray Detection

“…The X-ray reflection peaks including those small peaks in the XRD pattern (black) observed from the nondoped crystal are assigned to the orthorhombic phase of CsPbBr 3 (ICSD #97851, Figure S1), suggesting that the orthorhombic-phase CsPbBr 3 crystals were obtained by the inverse temperature crystallization method. As shown in a representative zoomed-in XRD pattern (bottom of Figure c), with increasing loading ratio of RbBr (i.e., doping ratio of Rb), these X-ray reflection peaks exhibited a slight peak shift toward a higher 2θ angle, which suggests that Rb has been doped into the CsPbBr 3 lattice structure successfully. − It should be noted that the inductively coupled plasma optical emission spectrometry (ICP-OES) measurements showed that only 0.037 and 0.366% Rb were actually doped into CsPbBr 3 when 1 and 10% RbBr were loaded into the precursor solution, respectively (Table S1). This observation is in good agreement with a small X-ray peak shift induced by 1 and 10% RbBr loading and further demonstrates that only a small amount of Rb can be doped into the CsPbBr 3 lattice structure.…”

“…Further increasing the doping ratio of Rb from 0.037 to 0.366% results in an increase of the optical band gap of CsPbBr 3 , which is consistent with the previous reports. 36,37 The increase of the optical band gap at a higher Rb-doping ratio is attributable to either the tilting of octahedron 37 or the decrease in the overlap of the electron-wave function due to the contraction and distortion of the crystal structure with doping smaller Rb atoms. 36 As shown in Figure 1e, it is worth noting that the small bumps of PL spectra in the range from 550 to 580 nm are most likely due to reabsorption of emission within the bulk of the crystal.…”

Highly Stable Lead-Free Cs3Bi2–yEryBr9 Fluorozirconate Perovskite Glasses with MIR Luminescence

“…Figure 1a−f shows the X-ray photoelectron spectroscopy (XPS) is used to characterize the change in the chemical bond. As shown in Figure 4a, the spectra clearly exhibit that all of the elements (Br, Er, Bi, Cs, Zr, 29 It is further verified that Cs 3 Bi 2−y Er y Br 9 crystallizes successfully in the glass matrix.…”

“…In 2017, Di et al successfully precipitated CsPbBr 3 QDs into a phosphosilicate glass using a heat treatment method. 29 A change in the heat treatment temperature produced an intense green photoluminescence, with the photoluminescence band tuned from 497 to 523 nm. Above all, the perovskite glasses showed excellent stability against light and heat.…”

“…Transition Probability A (S −1 ), Fluorescence Branch Ratio β (%), and Lifetime τ (ms) of Er 3+ in the 0.3Cs 3 Bi 2−y Er y Br 9 Perovskite Glass Sample al. are not obvious 29. This may be due to different glass matrixes.…”