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.201900127

Cited by 23 publications

(22 citation statements)

References 59 publications

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“…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: D-networked Cs 4 Pbxmentioning

confidence: 94%

“…[47][48][49][50][51][52][53] On the other hand, the self-trapped exciton indicated a bound electron-hole pair trapped via strong electron/holelattice 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: D-networked Cs 4 Pbxmentioning

confidence: 96%

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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: D-networked Cs 4 Pbxmentioning

confidence: 94%

Section: D-networked Cs 4 Pbxmentioning

confidence: 96%

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

et al. 2020

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“…Unfortunately, the optical gain of QDs are always limited by the nonradiative biexciton (multicarrier) Auger recombination, [45] which is especially severe as the excitation intensity becomes higher. Unfortunately, the optical gain of QDs are always limited by the nonradiative biexciton (multicarrier) Auger recombination, [45] which is especially severe as the excitation intensity becomes higher.…”

mentioning

confidence: 99%

“…In general, for the potential application in stimulated emission, such as ASE and lasing, the characteristic of optical gain from laser medium is extremely important. Unfortunately, the optical gain of QDs are always limited by the nonradiative biexciton (multicarrier) Auger recombination, which is especially severe as the excitation intensity becomes higher. If extra carriers exist, the energy released during electron–hole recombination could be nonradiatively transferred to it, rather than contribute to the generation of photon.…”

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confidence: 99%

Single Halide Perovskite/Semiconductor Core/Shell Quantum Dots with Ultrastability and Nonblinking Properties

et al. 2019

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The further practical applications of halide perovskite quantum dots (QDs) are blocked by problems of instability and nonradiative Auger recombination manifested as photoluminescence blinking. Here, single core/shell structured perovskite semiconductor QDs are successfully fabricated by capping CsPbBr3 QD core with CdS shell. It is demonstrated that CsPbBr3/CdS core/shell QDs exhibit ultrahigh chemical stability and nonblinking photoluminescence with high quantum yield due to the reduced electronic traps within the core/shell structure. Efficiency of amplified spontaneous emission exhibits obvious enhancement compared to that of pure CsPbBr3 QDs, originating from the mitigated competition between stimulated emission and suppressed nonradiative biexciton Auger recombination. Furthermore, low‐threshold whispering‐gallery‐mode lasing with a high‐quality factor is achieved by incorporating CsPbBr3/CdS QDs into microtubule resonators. Density functional theory (DFT)‐based first‐principles calculations are also performed to reveal the atomic interface structure, which supports the existence of CsPbBr3/CdS structure. An interesting feature of spatially separated charge density at CsPbBr3/CdS interface is found, which may greatly contribute to the suppressed Auger recombination. The results provide a practical approach to improve the stability and suppress the blinking of halide perovskite QDs, which may pave the way for future applications for various optoelectronic devices.

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“…Development of perovskite lasers that can sustain for longer times has attracted attention. [ 144–146 ] New perovskites with better temperature and moisture stability have been employed to improve the laser stability. By using all‐inorganic perovskites which exhibit better stability, Eaton et al demonstrated single‐crystal CsPbX 3 nanowire lasers with improved stability.…”

Section: Stability Of Optically Pumped Perovskites Light Sourcesmentioning

confidence: 99%

Stability of Perovskite Light Sources: Status and Challenges

Chen

Cui

et al. 2020

Advanced Optical Materials

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Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances of the degradation models for perovskites and strategies for enhancing the stability of the corresponding light sources are summarized. Improving the stability and quality of perovskite materials is a common way for developing stable perovskite light sources. For strengthening the stability of perovskite light‐emitting diodes, approaches such as surface and interface engineering and employing more stable hole injection layers are effective. To enhance the stability of perovskite amplified spontaneous emission and lasers, methods such as protecting perovskites by materials with high intrinsic thermal conductivity and high stability, better thermal managements, and reducing the threshold carrier densities are useful. This work will be helpful for further prompting the performances, especially the stability of perovskite light sources in this fantastic field.

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

Cited by 23 publications

References 59 publications

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

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

Single Halide Perovskite/Semiconductor Core/Shell Quantum Dots with Ultrastability and Nonblinking Properties

Stability of Perovskite Light Sources: Status and Challenges

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