Blue-green tunable luminescence mechanism of a novel Tb3+ doped Cs4PbBr6 quantum dots tellurite glass

Duan, Yongmin; Li, Panpan; Lu, Yang; Tian, Ying; Cai, Muzhi; Huang, Feifei; Xu, Shiqing; Zhang, Junjie

doi:10.1016/j.jlumin.2020.117799

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…Based on our previous study on the photoluminescence mechanism of Cs 4 PbBr 6 QDs, 15,27,28 it can be speculated that the broad peak emission and bimodal emission in the RL spectrum are still connected with the Br vacancy. However, as the result displayed in Figure 3b, the RL intensity of Cs 4 PbBr 6 QDs glass ceramics did not change with the reducing Br vacancy.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, halide perovskite materials and their derivatives have been demonstrated to be a kind of high quality and inexpensive X-ray scintillator with high performance for optoelectronic applications. − In the whole cesium lead bromide family, zero-dimensional Cs 4 PbBr 6 QDs have attracted much attention due to their unique electronic dimension and structure. − Additionally, Cs 4 PbBr 6 QDs also have high photoluminescence quantum yield and good stability. − Therefore, they have been developed as a potential material for X-ray detection. ,, For example, Ouyang’s team synthesized centimeter-sized lead-halide Cs 4 PbBr 6 single crystals by solution processing and found that Cs 4 PbBr 6 single crystals exhibited not only a high photoluminescence quantum yield (PLQY) but also strong green emission under X-ray excitation . In 2019, CsPbBr 3 @Cs 4 PbBr 6 powder was synthesized via a recrystallization method by Zeng’s team, and a large-area CsPbBr 3 @Cs 4 PbBr 6 film (360 mm × 240 mm) fabricated by a blade-coating technique imaging screen showed high-quality X-ray imaging .…”

Section: Introductionmentioning

confidence: 99%

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

Liu

et al. 2021

J. Phys. Chem. C

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Zero-dimensional halide perovskite materials have recently shown great potential in the field of X-ray detection. Herein, Cs4PbBr6 quantum dots (QDs) glass ceramics, which can be used as scintillator materials, were fabricated by a molten salt method. The perovskite glass ceramics not only maintained the original high air stability of glass but also had high quantum yield (49.7%) and crystallinity. Not only that, QD-based solid powder exhibited strong green luminescence under the illumination of both X-ray and UV light. In addition, a novel dual emission is observed in the radioluminescence spectra of Cs4PbBr6 QDs. Electron paramagnetic resonance (EPR) and X-ray diffraction (XRD) suggested that the novel dual emission is associated with the Br vacancy. It is worth noting that after repeated X-ray irradiation, the radioluminescence (RL) intensity of the Cs4PbBr6 QDs glass ceramic sample can be increased to 6.2 times the initial intensity, which provides a new idea for the long-term repeated use of scintillator materials. These results demonstrated that Cs4PbBr6 QDs glass ceramics are promising materials in scintillator fields.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liu

et al. 2021

J. Phys. Chem. C

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“…Trap states locating below the minimum of the conduction band (CBM) are introduced, which make the bandgap down shift to about 2.7 eV (Figure S8 , S9 ). Radiative transitions of these trap states explain the blue emissions [ 41 – 44 ].…”

Section: Resultsmentioning

confidence: 99%

Tunable Multicolor Fluorescence of Perovskite-Based Composites for Optical Steganography and Light-Emitting Devices

Gui

Liu

et al. 2022

Research

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Multicolor fluorescence of mixed halide perovskites enormously enables their applications in photonics and optoelectronics. However, it remains an arduous task to obtain multicolor emissions from perovskites containing single halogen to avoid phase segregation. Herein, a fluorescent composite containing Eu-based metal-organic frameworks (MOFs), 0D Cs 4 PbBr 6 , and 3D CsPbBr 3 is synthesized. Under excitations at 365 nm and 254 nm, the pristine composite emits blue (B) and red (R) fluorescence, which are ascribed to radiative defects within Cs 4 PbBr 6 and 5 D 0 → 7 F J transitions of Eu 3+ , respectively. Interestingly, after light soaking in the ambient environment, the blue fluorescence gradually converts into green (G) emission due to the defect repairing and 0D-3D phase conversion. This permanent and unique photochromic effect enables anticounterfeiting and microsteganography with increased security through a micropatterning technique. Moreover, the RGB luminescence is highly stable after encapsulation by a transparent polymer layer. Thus, trichromatic light-emitting modules are fabricated by using the fluorescent composites as color-converting layers, which almost fully cover the standard color gamut. Therefore, this work innovates a strategy for construction of tunable multicolor luminescence by manipulating the radiative defects and structural dimensionality.

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“…34 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, 22,23,30,40,41 and the weak Xray diffraction peaks of the glass-ceramic cannot be attributed to the CsPbX 3 cubic phase. 42−45 However, few reports have systematically studied the growth mechanism of QDs in a glass matrix.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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Oxide glass matrix embedding is an effective way to improve the stability of halide quantum dots (QDs). However, the in situ growth mechanism of halide perovskite QDs in an amorphous matrix has not been clarified. In this work, the growth process of halide QDs in an amorphous oxide matrix was successfully elucidated via in situ spectroscopy, analytical electron microscopy, and the X-ray scattering/diffraction technique. The results showed that the in situ growth mechanism of the halide QDs in the amorphous oxide matrix was different from that of traditional glassceramics, which was more like a halide nanoglass-based phase transition process. Typically, a complex multiphase (halide nanoglass, CsPb 2 X 5 , and CsPbX 3 ) transition existed in the amorphous oxide matrix, and the obtained CsPbX 3 QD glass showed a halide multiphase coexisting microstructure. More importantly, the crystallization process from the halide nanoglass to QDs can be induced by known ways, including mechanical force, hydration, and heat treatment. The clarified in situ growth mechanism may pave the way toward the development of high-efficiency halide perovskite QD-embedded amorphous materials and optoelectronic devices.

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Blue-green tunable luminescence mechanism of a novel Tb3+ doped Cs4PbBr6 quantum dots tellurite glass

Cited by 17 publications

References 35 publications

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

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

Tunable Multicolor Fluorescence of Perovskite-Based Composites for Optical Steganography and Light-Emitting Devices

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

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Blue-green tunable luminescence mechanism of a novel Tb3+ doped Cs4PbBr6 quantum dots tellurite glass

Cited by 17 publications

References 35 publications

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

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

Tunable Multicolor Fluorescence of Perovskite-Based Composites for Optical Steganography and Light-Emitting Devices

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

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Product

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