Negative thermal quenching CsPbBr3 glass-ceramic based on intrinsic radiation and vacancy defect co-induced dual-emission

Origin of Radioluminescence in Low-Dimensional Halide Perovskite Glass Ceramics under X-ray Excitation

“…To eliminate the influence of the glass matrix, glass ceramics without QDs were prepared under the same experimental conditions, and then, the glass ceramics were excited by 50 keV X-rays, but the results show that almost no luminescence could be detected in the RL spectrum (Figure a). It can be seen from these results that the wide peak located at 433 nm is still only related to Cs 4 PbBr 6 QDs. , However, when the sample glass was placed in the air environment for 5 days, as shown in Figure b, it could be found that the broad emission peak at 433 nm still existed, while a narrow emission peak at 520 nm appeared, and the characteristics of this 520 nm emission peak were exactly consistent with the RL luminescence of Cs 4 PbBr 6 reported previously. , Significantly, when the Cs 4 PbBr 6 sample continued to be placed in the air for the 10th day, only single peak emission can be observed in the RL spectrum. To further explore the origin of the broad emission peak, the Cs 4 PbBr 6 glass ceramic powder placed for 30 days was characterized by XRD again.…”

“…It can be seen from these results that the wide peak located at 433 nm is still only related to Cs 4 PbBr 6 QDs. 25,26 However, when the sample glass was placed in the air environment for 5 days, as shown in Figure 3b, it could be found that the broad emission peak at 433 nm still existed, while a narrow emission peak at 520 nm appeared, and the characteristics of this 520 nm emission peak were exactly consistent with the RL luminescence of Cs 4 PbBr 6 reported previously. 20,21 Significantly, when the Cs 4 PbBr 6 sample continued to be placed in the air for the 10th day, only single peak emission can be observed in the RL spectrum.…”

In Situ Growth Mechanism of CsPbX3 (X = Cl, Br, and I) Quantum Dots in an Amorphous Oxide Matrix

“…It is worth noting that there are still some common phenomena but difficult to reasonably explain for the reported QD growth mechanism in the glass matrix. For example, the luminescence phenomenon originates from the as-prepared glass containing the QD precursor, ,,,, and the weak X-ray diffraction peaks of the glass-ceramic cannot be attributed to the CsPbX 3 cubic phase. − However, few reports have systematically studied the growth mechanism of QDs in a glass matrix. , Instead, most of the research studies focused on the performance and applications of CsPbX 3 QD glasses. − Unfortunately, in addition to thermal stability, the major properties of CsPbX 3 QDs in a glass matrix are still significantly inferior to those of colloidal QDs, especially quantum efficiency. − Although the performance of the CsPbX 3 QDs in the matrix has been improved by trial-and-error experiments in the past few years, it is difficult to design and control the properties of the CsPbX 3 QDs in an amorphous matrix because of a variety of contradictory mechanisms. Therefore, it is very urgent and important to elucidate the whole crystallization process and clarify the in situ growth mechanism of the CsPbX 3 QDs in an amorphous matrix.…”

Ceramics, Glass and Glass-Ceramics for Personal Radiation Detectors

“…In the case of borate and phosphate glasses, radiation defects are related mainly to the absence or excess of oxygen atoms in the amorphous glass structure [28][29][30]. For silicate, telluride or heavy metal fluoride glasses, radiation defects may be also color centers or structural vacancies [31,32]. Therefore, when heat or light stimulate the structure of the glass, the recombination of charges results in luminescence.…”