Tuning the optical properties in CsPbBr₃ quantum dot-doped glass by modulation of its network topology

Abstract

All inorganic metal halide perovskite quantum dots (QDs) exhibit excellent optical properties promising for diverse applications, while their inherent frangibility remains an enormous challenge for both scientific research and practical...

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

“…The peak of 480 cm −1 is assigned to the [SiO 4 ] and [BO 4 ] units 28,31 . The peak near 770 cm −1 is assigned to the B‐O‐B stretching vibration of [BO 4 ] tetrahedral units and the B‐O‐B bending vibration in [BO 3 ] triangles units 28,32 . Consistent with the result of FT‐IR, the Raman peak near 480 cm −1 becomes smooth with SiO 2 further replaced by ZnO, which indicates the decrease in the concentration of [SiO 4 ] unit in the glass structure.…”

“…The band near 450 cm −1 is ascribed to the Si‐O‐Si bending vibration in the [SiO 4 ] tetrahedron, 26,27 which becomes smooth with SiO 2 further replaced by ZnO. The band near 530 cm −1 in glass sample Zn18.6 is ascribed to Zn‐O vibration of [ZnO 4 ] 28 . 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.…”

“…Raman spectra of the glass samples with different ZnO concentrations in the wavenumber range of 200–1000 cm −1 were shown in Figure 3B. The peak of 480 cm −1 is assigned to the [SiO 4 ] and [BO 4 ] units 28,31 . The peak near 770 cm −1 is assigned to the B‐O‐B stretching vibration of [BO 4 ] tetrahedral units and the B‐O‐B bending vibration in [BO 3 ] triangles units 28,32 .…”

“…28,31 The peak near 770 cm −1 is assigned to the B-O-B stretching vibration of [BO 4 ] tetrahedral units and the B-O-B bending vibration in [BO 3 ] triangles units. 28,32 Consistent with the result of clearly decreases, which is beneficial for the movement of Cs + , Pb 2+ , and I − ions and the growth of CsPbI 3 QDs in the glass. Figure 4A,E shows the absorption spectra and PL spectra of glass samples with different ZnO concentrations.…”

Effect of Glass Composition on Luminescence and Structure of CsPbBr3 Quantum Dots in an Amorphous Matrix

“…For example, cationic doping of halide perovskite QDs can be achieved by adjusting the composition of the glass matrix [ 21 , 22 , 23 , 24 ], resulting in the observation of persistent luminescence from halide perovskite QDs [ 25 ]. The diffusion kinetics of precursor ions of CsPbX 3 QDs can be changed by adjusting the glass network structure [ 26 , 27 , 28 , 29 ], which affects the optical properties of the QDs in a glass matrix. The heterogeneous pair-bonds are existing on the interface between the QDs and the glass matrix [ 30 , 31 , 32 ], which leads to the formation of defects on the QDs surface, thus affecting the optical properties of the QDs embedded in the glass matrix.…”