Effect of topological structure on photoluminescence of CsPbBr3 quantum dot doped glasses

Effect of ZnO on the crystallization and photoluminescence of CsPbI3 perovskite quantum dots in borosilicate glasses

“…The absorption bands at 705 and 1370–1410 cm −1 are contributed from the bending vibration and asymmetric stretching vibration of the B‐O‐B bond in [BO 3 ] triangle, 29 respectively. Stretching vibration of B‐O bond in [BO 4 ] unit and [SiO 4 ] unit (1010–1030 cm −1 ) and vibration of the boron‐oxygen ring (1270 cm −1 ) are also observed 30 . Raman spectra of the glass samples with different ZnO concentrations in the wavenumber range of 200–1000 cm −1 were shown in Figure 3B.…”

“…We consider that the red shift of absorption edge and PL peak wavelength is attributed to the quantum size effect. The results of FT‐IR and Raman spectra suggest that with increasing ZnO concentration the number of [SiO 4 ] tetrahedron units forming the 3D glass network structure clearly decreases, resulting in a decrease in glass network connectivity, which is beneficial for the movement of Cs + , Pb 2+ and I − ions and the growth of CsPbI 3 QDs in the glass 30,33 . However, with the further ZnO concentration, excessive crystallization of perovskite QDs causes the darkening of the resultant glass samples and the decrease in PL intensity, which can be ascribed to the enhanced coupling by high‐concentration QDs and reabsorption effect.…”

“…The results of FT-IR and Raman spectra suggest that with increasing ZnO concentration the number of [SiO 4 ] tetrahedron units forming the 3D glass network structure clearly decreases, resulting in a decrease in glass network connectivity, which is beneficial for the movement of Cs + , Pb 2+ and I − ions and the growth of CsPbI 3 QDs in the glass. 30,33 However, with the further ZnO concentration, excessive crystallization of perovskite QDs causes the darkening of the resultant glass samples and the decrease in PL intensity, which can be ascribed to the enhanced coupling by high-concentration QDs and reabsorption effect. Figure 4D shows the excitation spectra of glass samples with different ZnO concentrations measured under the respective PL peak wavelengths (as shown in Table 1), indicating that the CsPbI 3 QDs exhibit a broadband excitation band.…”

Water‐induced CsBr crystalline transition to CsPbBr3 and the change of luminescence properties in borophosphate glass

“…Zhang et al. successfully precipitated CsPbBr 3 quantum dots in borosilicate glass by heat induction, 18 and studied the effect of topological structure on its photoluminescence (PL). Wang et al.…”

“…[14][15][16][17] As we all know, the low binding energy of CsPbBr 3 NCs account for their poor stability, and just because of this, they are easier to prepare. Zhang et al successfully precipitated CsPbBr 3 quantum dots in borosilicate glass by heat induction, 18 and studied the effect of topological structure on its photoluminescence (PL). Wang et al obtained CsPbBr 3 NCs glass by self-crystallization without heat treatment via Li + doping.…”