Two-photon pumped lasing in a single CdS microwire

Zhang, Lichao; Wang, Kai; Liu, Zhe; Yang, Guang; Shen, Guozhen; Lu, Peixiang

doi:10.1063/1.4809537

Cited by 23 publications

(17 citation statements)

References 25 publications

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“…Under a pump fluence slightly below the ASE threshold (310 µJ cm −2 ), the PL decay lifetime is ≈130 ps, much shorter than the typical excitonic recombination lifetimes (a few ns) of these CMDs (see in Figure S14, Supporting Information). The reason of the short lifetime is the generation of multiexciton . This ≈130 ps relaxation time closely matches the Auger‐limited biexciton recombination lifetimes.…”

Section: Resultssupporting

confidence: 68%

“…Under high pump intensity, the pump intensity dependent PL peak intensity exhibits a relationship far beyond quadratic, which refers to the ASE process. Thus, the threshold of two‐photon pumped ASE (2ASE) is estimated to be 400 µJ cm −2 , which is lower than that of previously reported CsPbBr 3 /Cs 4 PbBr 6 composite microcrystals and many other inorganic semiconductors (see Table S2, Supporting Information) . In CsPbBr 3 NCs, the ASE threshold typically is limited by the surface fast charge carrier trapping and multiparticle Auger recombination .…”

Section: Resultsmentioning

confidence: 75%

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Solution‐Processed Perovskite Microdisk for Coherent Light Emission

Li¹,

Zhang

Li³

et al. 2019

Advanced Optical Materials

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High‐quality semiconductor microdisks (MDs) are of crucial importance for realizing on‐chip coherent light sources. However, the fabrication of all‐inorganic semiconductor circular or circular‐like microdisks (CMDs) with suitable size for optoelectronic applications is still complex and expensive. Herein, a facile ligand‐free antisolvent‐assisted growth method is used to synthesize high‐quality Cs4PbBr6 MDs with tunable size and morphology, which is evolved from rhombohedral to octahedral, hexagonal‐like, and circular‐like MDs based on Cl‐containing antisolvents. Significantly, this is the first time that large semiconductor CMDs are synthesized from solution self‐assembled growth at room temperature. These Cs4PbBr6 MDs show high‐efficient and stable green emission (522 nm), which should be attributed to the first‐order excitonic emission from embedded CsPbBr3 nanocrystals (NCs). The distribution of CsPbBr3 NCs is verified by lattice fringe, crystal data refinement, and time‐resolved photoluminescence analysis. These CsPbBr3‐in‐Cs4PbBr6 CMDs are demonstrated to hold outstanding two‐photon pumped coherent light emission ability with a remarkably low threshold (400 µJ cm−2). These findings suggest CsPbBr3‐in‐Cs4PbBr6 MDs have excellent light emission capability and stability toward practical optoelectronic applications, and their tunable morphology and size indicate that solution method is feasible for the fabrication of semiconductor CMDs.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 75%

Solution‐Processed Perovskite Microdisk for Coherent Light Emission

Li¹,

Zhang

Li³

et al. 2019

Advanced Optical Materials

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“…Therefore, it could be predicted that the lasing action from perovskite microcubes should be less sensitive to the excitation direction. In addition, compared to linear absorption and emission, the nonlinearity of semiconductor materials has attracted considerable attention because of the merits of multi‐photon features, such as the deep penetration depth, high spatial resolution, and little damage to targeted samples . Recently, all‐inorganic perovskite materials have been introduced into nonlinear optical devices .…”

Section: Introductionmentioning

confidence: 99%

Robust Cesium Lead Halide Perovskite Microcubes for Frequency Upconversion Lasing

Liu

Bian

et al. 2017

Advanced Optical Materials

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FETs), [10,11] memristors, [12,13] and nano lasers [14][15][16] because of their unique optical and electronic characteristics. Recently, much research has been carried on the amplified spontaneous emission (ASE) and lasing of perovskite materials because of their tunable bandgap. For examples, Xing et al. have reported lowtemperature solutionprocessed wavelengthtunable perovskites for lasing, [17] and Xiong et al. have reported nearinfrared nanolasers (Q around 1320) based on organic-inor ganic hybrid perovskite CH 3 NH 3 PbX 3 (X = Cl, Br, I) nanoplatelets. [18] However, regardless of their superior optoelectronic performance, the instability of organicinorganic hybrid perovskites due to their susceptibility for hydrolysis is recog nized as a critical issue for their further practical applications. [19][20][21] Compared to organic-inorganic hybrid perovskites, an allinorganic cesium lead halide perovskite CsPbX 3 (X = Cl, Br, I) has been developed to improve the chemical stability. [22][23][24] In the past several years, allinorganic perovskite nanomaterials CsPbX 3 (X = Cl, Br, I) have found many applications including for amplified spontaneous emission (ASE), lasing, and displays thanks to their excel lent optical performance. [25][26][27][28][29] It is well known that one and twodimensional (2D) crystals, including nanowires, [25,30] nanorods, [31] nanoplates, [30] and microplates [32] are efficient optical gain materials for optical amplification. Moreover, Halide perovskite nanomaterials have recently attracted a lot of attention in the nanoscale laser research field, especially two-photon pumped lasing in halide perovskite nanomaterials has been considered as an ideal alternative strategy to achieve frequency upconversion. However, the poor stability of current organic-inorganic lead halide perovskite materials hinder their further practical applications. Herein, facile solution-processed cesium lead halide perovskite CsPbX 3 (X = Br, I, or Cl) microcubes with low-threshold lasing, high quality, enhanced stability, and excellent wavelength tunability are reported. These as-prepared CsPbX 3 microcubes display excellent structure stability under ambient conditions for several months and they are found to be more robust than their organic-inorganic counterparts. The smooth end facets and wavelength-comparable dimensions make these microcubes promising for high-quality laser cavities in three dimensions. Fabry-Perot lasing is demonstrated in CsPbX 3 microcubes, the process of which is investigated by dynamic emission. In addition, tunable amplified spontaneous emission is achieved with low threshold under both one-and two-photon excitation, which can maintain a stable emission for over 10 hours under continuous intense laser shots in ambient atmosphere. The findings suggest that solution-processed all-inorganic perovskite microcubes can be used as excellent gain medium for frequency upconversion lasers, which would offer a new platform for nonlinear photoelectric devices.

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“…In principle, two fundamental factors are crucial to the achievement of low threshold lasers, including 1) the gain media with high quantum efficiency and 2) a high‐quality microresonator with high efficient optical feedback. As an important II–VI semiconductor with extraordinary optical gain properties, CdS has been qualified to be an excellent gain material for small‐sized lasers in highly integrated photonic applications . However, previous CdS nanowire (NW) lasers have suffered from high lasing threshold, due to the low end‐face reflection and high self‐absorption induced energy loss in NW cavity.…”

Section: Comparison Of Lasing Threshold Values and Preparation Methodmentioning

confidence: 99%

High‐Quality Hexagonal Nonlayered CdS Nanoplatelets for Low‐Threshold Whispering‐Gallery‐Mode Lasing

Jin

Zhao

et al. 2019

Small

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threshold lasers, including 1) the gain media with high quantum efficiency and 2) a high-quality microresonator with high efficient optical feedback. As an important II-VI semiconductor with extraordinary optical gain properties, CdS has been qualified to be an excellent gain material for small-sized lasers in highly integrated photonic applications. [5][6][7][8] However, previous CdS nanowire (NW) lasers have suffered from high lasing threshold, due to the low end-face reflection [9] and high self-absorption induced energy loss [6,10] in NW cavity. Compared with Fabry-Pérot (F-P) mode cavity in NW lasers, whispering-gallery-mode (WGM) cavities have been demonstrated to hold stronger confinement of the optical fields due to the total internal reflection inside the cavity, leading to higher optical feedback. [11,12] Therefore, introducing WGM cavity into CdS laser would be an effective solution to reduce the lasing threshold. In this respect, polygonal CdS nanoplatelets (NPLs) are promising candidates for the development of low-threshold lasers. Considerable efforts have been made to realize the anisotropic growth on nonlayered crystals (such as PbS, [13] TiO 2 , [14] CdS, [15,16] and CdSe [17] ) but with limited success. However, direct synthesis of the 2D nonlayered CdS crystals is still challenging, since spitting the intrinsic isotropic chemical bond Low threshold micro/nanolasers have attracted extensive attention for wide applications in high-density storage and optical communication. However, constrained by quantum efficiency and crystalline quality, conventional semiconductor small-sized lasers are still subjected to a high lasing threshold. In this work, a low-threshold planar laser based on high-quality singlecrystalline hexagonal CdS nanoplatelets (NPLs) using a self-limited epitaxial growth method is demonstrated. The as-grown CdS NPLs show multiplewhispering-gallery-mode lasing at room temperature with a threshold of ≈0.6 µJ cm −2 , which is the lowest value among reported CdS-based lasers. Through power-dependent lasing studies at 77 K, the lasing action is demonstrated to originate from a exciton-exciton scattering process. Furthermore, the edge length-and thickness-dependent lasing threshold studies reveal that the threshold is inversely proportional to the second power of lateral edge length while partially affected by vertical thickness, and the lasing modes can be sustained in NPLs as thin as 60 nm. The lowest threshold emerges with the thickness of ≈110 nm due to stronger energy confinement in the vertical Fabry-Pérot cavity. The results not only open up a new avenue to fabricate nonlayered material-based coherent light sources, but also advocate the promise of nonlayered semiconductor materials for the development of novel optoelectronic devices.

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Two-photon pumped lasing in a single CdS microwire

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Cited by 23 publications

References 25 publications

Solution‐Processed Perovskite Microdisk for Coherent Light Emission

Solution‐Processed Perovskite Microdisk for Coherent Light Emission

Robust Cesium Lead Halide Perovskite Microcubes for Frequency Upconversion Lasing

High‐Quality Hexagonal Nonlayered CdS Nanoplatelets for Low‐Threshold Whispering‐Gallery‐Mode Lasing

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