High‐Quality Single‐Mode Lasers Based on Zero‐Dimensional Cesium Lead Halide Perovskites

Yang, Jie; Liu, Zhengzheng; Zeng, Fanju; Pi, Mingyu; Shi, Tongchao; Bian, Yao; Tang, Xiaosheng; Du, Juan; Liu, Weimin; Leng, Yuxin

doi:10.1002/solr.201970095

Cited by 6 publications

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“…[ 47–53 ] On the other hand, the self‐trapped exciton indicated a bound electron–hole pair trapped via strong electron/hole–lattice coupling, possibly leading to the formation of a polaron in the lattice distortion filed. [ 34,49,54 ] The self‐trapped exciton has been confirmed in a variety of characterization technologies. For example, the excited‐state dynamics were investigated by femtosecond transient absorption measurements.…”

Section: Properties and Emission Originsmentioning

confidence: 99%

“…For example, the excited‐state dynamics were investigated by femtosecond transient absorption measurements. [ 54 ] The stable energy of photoinduced bleach was 2.44 eV of Cs 4 PbBr 6 . A broad positive band below the bandgap was observed due to polaron absorption, illustrating the polaronic states of Cs 4 PbBr 6 .…”

Section: Properties and Emission Originsmentioning

confidence: 99%

“…For the synthesis of Cs 4 PbX 6 NCs [ 50,52,54,132–134 ] and microcrystals, [ 54 ] a reverse microemulsion system was developed, which comprised of DMF droplet suspended in a hexane phase due to the immiscible nature of DMF and hexane. Prior to the mixing of different solvents, Cs and Pb precursors (molar ratio 4:1) were thoroughly dissolved in DMF and hexane with the assistance of capping ligands, OA and OAm.…”

Section: Direct Synthesis Of Low‐dimensional‐networked Perovskitesmentioning

confidence: 99%

“…In terms of Cs 4 PbBr 6 with green emission, it too could be employed into the fabrication of high‐quality lasers as well. [ 54,123 ] The single‐mode laser demonstrated low lasing thresholds and high‐quality factors under both one‐ and two‐photon excitation. Strikingly, the integrated PL intensity under a continuous pulsed laser of 800 nm lasted for more than 2 h. These lasers have shown great potential in various applications.…”

Section: Applicationsmentioning

confidence: 99%

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Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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resistance against thermal-treatment compared to organic-inorganic hybrid lead halide perovskites (MAPbX 3 and FAPbX 3), due to the high thermal decomposition temperature of inorganic cations, thus drawing much attention. Owing to their impressive features, all-inorganic lead halide perovskites have been greatly useful in photovoltaic and optoelectronic applications, including solar cells, light-emitting diodes (LEDs), lasers, photodetectors and photocatalysis. [5-17] The conspicuous achievements in CsPbX 3 provoke the rapid development of its derivatives, Cs 4 PbX 6 and CsPb 2 X 5. These Cs x Pb y X z materials are composed of the same element compositions and [PbX 6 ] 4− unit cells. However, they possess completely different connectivity characters of [PbX 6 ] 4− octahedrons. CsPbX 3 is classified as a type of 3D perovskite, because [PbX 6 ] 4− octahedra are corner-shared along all three axes, while CsPb 2 X 5 has a sandwich-like arrangement with Cs + cations in between PbX 2 crystallographic planes, which can be regarded as a 2D phase. In Cs 4 PbX 6 , disconnected [PbBr 6 ] 4− octahedra are completely decoupled by Cs + cations. Among these three structures, CsPb 2 X 5 and Cs 4 PbX 6 , with dimensional-network less than 3 are referred to as lowdimensional-networked cesium lead halide perovskites. Besides the connectivity, these structures can be understood from a confinement perspective. CsPbX 3 is not confined in any dimension such that it can be considered as a 3D networked semiconductor. CsPb 2 X 5 and Cs 4 PbX 6 are confined in one dimension and all three dimensions, hence the name 2D and 0D structures, respectively. [18,19] In CsPb 2 X 5 and Cs 4 PbX 6 , the excitons cannot dissociate easily within all dimensions; instead, they are confined in the PbX 2 planes and individual [PbX 6 ] 4− units, respectively, resulting in larger bandgaps compared to the traditional ABX 3 phase. Figure 1 illustrates these three structures with different dimensions. Until now, comprehensive accounts of these Cs x Pb y X z materials have been made. However, most recent research focuses on CsPbX 3 , which has excellent optical properties and promising potential in various applications. Its derivatives, CsPb 2 X 5 and Cs 4 PbX 6 have achieved tremendous progress but are still far behind that of CsPbX 3. Many problems still seriously limit the rapid development of these low-dimensional-networked perovskites, a typical one being the debate on the origin of their luminescence. In this Review article, we focus on Cs 4 PbX 6 and CsPb 2 X 5 , and attempt to unveil their features, potential in All-inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low-dimensional-networked structures have also attracted great attention. In this review, recent advancements on the low-dimensional-networked cesium lead halide perovs...

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Section: Properties and Emission Originsmentioning

confidence: 99%

Section: Properties and Emission Originsmentioning

confidence: 99%

Section: Direct Synthesis Of Low‐dimensional‐networked Perovskitesmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

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Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

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“…31,33 Thus, 0-D Cs 4 PbBr 6 is expected to perform better than CsPbBr 3 as bright light emitters in closely assembled solid platforms or bulk crystals. So far, 0-D Cs 4 PbBr 6 has found intriguing applications in LEDs, 34 lasing, 28,35 and solar energy concentrators. 36 On the route to further accelerate research progress with rationally designed Cs 4 PbBr 6 , two challenging issues have been recognized.…”

Section: Introductionmentioning

confidence: 99%

Submillimeter-Scale Zero-Dimensional Cs₄PbBr₆ Perovskite Rods: Fabrication, Optical Properties, and Applications

Zhang

Sun

Liu

et al. 2020

ACS Appl. Electron. Mater.

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An antisolvent approach is developed to fabricate phase-pure zero-dimensional (0-D) perovskite Cs4PbBr6 microrods at submillimeter length scales with the microrod length facilely controllable by the growth time. A strong greenish photoluminescence narrow band is observed in the developed Cs4PbBr6 microrods. The corresponding photoluminescence quantum yield is as high as ∼50%, which is the highest value among microscale or bulk phase-pure Cs4PbBr6 materials reported thus far. When an individual Cs4PbBr6 microrod is pumped with a picosecond laser, the photoluminescence spectrum exhibits significant spectral narrowing down to 1 nm, suggesting the occurrence of lasing resonance. The pump threshold and lasing efficiency show strong dependence on the polarization of the pump laser with respect to the longitudinal axis of the microrod, offering a robust approach to tune figures of merit of lasing resonance. Moreover, lasing resonance strongly depends on the microrod length and longer microrods intend to emit stronger signals with obviously suppressed saturation behavior. Speckle-free optical imaging is demonstrated using an individual 0-D perovskite microrod laser to illuminate microscale objects, suggesting fundamental interest and potential applications of 0-D perovskite anisotropic structures.

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High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites

Yang

Liu

et al. 2020

Advanced Optical Materials

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Formamidinium (HC(NH2)+; FA) lead halide perovskites have emerged as potential candidates for solar cells, light‐emitting diodes, and lasing applications. However, the severely poor photostability of this material under UV irradiation seriously restricts the application on optoelectronic devices. In this paper, formamidinium lead halide (FAPbX3) quantum dots (QDs) adhered uniformly on the surface of amino‐mediated silica (A‐SiO2) spheres are successfully synthesized using a facile ligand‐assisted reprecipitation (LARP) method. Amazingly, the FAPbBr3/A‐SiO2 composites demonstrate excellent photostability after continuous illumination under UV lamps due to the effective suppression of the interactions and mutual contact between FAPbBr3 particles. In addition, the up‐conversion random lasing with a high quality (Q) factor of 1307 and low threshold of 413.7 µJ cm‐2 is successfully achieved from the FAPbBr3/A‐SiO2 composites at room‐temperature, which originates from the multiple random scattering of light and photon recycling provided by the silica spheres and the high gain characteristic of FAPbBr3 QDs. Moreover, different from regular lasers, random lasing does not rely on a laser cavity, which is promising in angle‐unlimited optical performance and easy/low‐cost fabrication. This work will open the window of high‐performance random lasers for digital light projector, high speed imaging, and speckle‐free full‐field imaging application.

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High‐Quality Single‐Mode Lasers Based on Zero‐Dimensional Cesium Lead Halide Perovskites

Cited by 6 publications

References 0 publications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Submillimeter-Scale Zero-Dimensional Cs₄PbBr₆ Perovskite Rods: Fabrication, Optical Properties, and Applications

High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites

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High‐Quality Single‐Mode Lasers Based on Zero‐Dimensional Cesium Lead Halide Perovskites

Cited by 6 publications

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Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Submillimeter-Scale Zero-Dimensional Cs4PbBr6 Perovskite Rods: Fabrication, Optical Properties, and Applications

High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites

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Submillimeter-Scale Zero-Dimensional Cs₄PbBr₆ Perovskite Rods: Fabrication, Optical Properties, and Applications