Search query: inorganic perovskite FP lasing

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abstract: Organic inorganic halide perovskite semiconductors are ideal gain media for fabricating laser and photonic devices due to high absorption, photoluminescence (PL) efficiency and low nonradiative recombination losses. Herein, organic inorganic halide perovskite CH3NH3PbI3 is embedded in the Fabry Perot (FP) microcavity, and a wavelength tunable excitonic lasing with a threshold of 12.9 mJ cm 2 and the spectral coherence of 0.76 nm are realized. The lasing threshold decreases and the spectral coherence enhances as the temperature decreases; these results are ascribed to the suppression of exciton irradiative recombination caused by thermal fluctuation. Moreover, both lasing and light emission below threshold from the perovskite microcavity (PM) system demonstrate a redshift with the decreasing temperature. These results provide a feasible platform based on the PM system for the study of light matter interaction for quantum optics and the development of optoelectronic devices such as polariton lasers.
author_names: Jiadao Wang

Peimei Da

Zhe Zhang

Song Luo

Liming Liao

Zeyuan Sun

Xuechu Shen

Shiwei Wu

Gengfeng Zheng

Zhanghai Chen
title: Lasing from lead halide perovskite semiconductor microcavity system.
venue: Nanoscale
year: 2018

abstract: Patterning of single crystalline lead halide perovskites (APbX3, X Cl, Br, I) into laser arrays has attracted considerable research attention. However, the random size distribution leads to an unrepeatable lasing action, which makes the fabrication of highly ordered laser arrays a formidable task. Beyond those single crystalline units, here, we report novel hybrid Concrete like perovskites (CPs) of CsPbBr3@MABr to obtain high quality optical micro cavity arrays for lasing. Similar to the case of Concrete, ~100 nm inorganic CsPbBr3 coarse aggregates bonded with finer cement like MABr, and presented a huge enhancement in optical gain (G 200 cm 1) and deformable plasticity. Well controlled dimensions and uniform geometries enable the CP micro rings and nanowires to function as high quality whispering gallery mode (WGM) and Fabry Perot (FP) lasers, respectively. The "Concrete" perovskite strategy provides new insights for the fabrication of high quality laser arrays with promising applications in integrated coherent light sources and photonics.
author_names: Haihua Zhang

Tiantian Chen

Hongbing Fu
title: Concrete perovskites for fabricating high quality micro laser arrays
year: 2020

abstract: Organic inorganic hybrid perovskites have been considered as promising gain materials for lasing. Despite previous reports of lasing from nanocrystals, thin films and single crystals, the stability of perovskite lasers has been a challenge for its practical applications. Herein, a scalable strategy to prepare ultrastable perovskite@polymer hybrid fibers by employing a facile emulsion electrospinning approach is demonstrated. During the electrospinning process, polymethyl methacrylate (PMMA) first solidifies into an outer shell layer. Meanwhile, emulsion drops containing poly(vinylidene fluoride) (PVDF) and perovskite precursor are pushed inward and evolve into perovskite nanocrystals covered by PVDF. The PMMA with smooth surface benefits the light transport and the water resistant PVDF blocks the moisture. The methylammonium lead bromide perovskite embedded fibers can emit intensive light after storage in humid ambient environment (relative humidity >60% or even in water. Amplified spontaneous emissions from the fibers network and waveguide lasing from chopped single fiber is demonstrated.
author_names: Zhe Wang

Haiyong He

Sheng Liu

Hongzhong Wang

Qingsheng Zeng

Zixun Liu

Qihua Xiong

Hong Jin Fan
title: Air Stable Organic Inorganic Perovskite Nanocrystals@Polymer Nanofibers and Waveguide Lasing.
venue: Small
year: 2020

abstract: Photo instability has prevented further commercialization of all inorganic perovskite nanocrystals (NCs) in the field of high power optoelectronics. Here, an accelerated transformation process from non luminescent Cs4PbBr6 to CsPbBr3 NCs with bright green emission is explored with irradiation at 365 nm during water triggered structural transformation. The photoelectric field provided by the photon energy of 365 nm promotes the rapid stripping of CsBr and atomic reconstruction, contributing to the production of ultrahigh photo stable defect free CsPbBr3 NCs. The robust emission output of the as obtained CsPbBr3 NCs is well preserved even when recorded after 160 min. Moreover, a long term stable random lasing could be achieved when excited using an ~800 nm femtosecond laser for at least 8.6 x 107 laser shots. Our results not only elucidate the photo induced accelerated phase transformation process of the all inorganic perovskites, but also open up opportunities to synthesize highly stable CsPbBr3 NCs for their practical application in photovoltaics and optoelectronics.
author_names: Liuli Yang

Ting Wang

Qiuhong Min

Chaojie Pi

Fan Li

Xiao Yang

Kongzhai Li

Dacheng Zhou

Jianbei Qiu

Xue Yu

Xuhui Xu
title: Ultrahigh photo stable all inorganic perovskite nanocrystals and their robust random lasing
year: 2020

abstract: Lead halide perovskites are highly promising for various optoelectronic applications including laser devices. However, fundamental photophysics describing the lasing behaviour in this material family have not been investigated systematically, and thus the detailed lasing mechanism remains veiled. Here, we demonstrate that an all inorganic perovskite shows a lasing emission based on a novel principle. A series of photoluminescence experiment results reveals that the excited state of CsPbBr3 single crystal exhibits free carrier nature. In a form of microcavity, on the other hand, the CsPbBr3 single crystal shows emission from polaritonic excited state, demonstrating the coexistence of excitonic nature. Room temperature polariton lasing is also clearly observed. This unprecedent mechanism, i.e. polariton lasing based on free carrier reservoir, is accomplished by the exciton/free carrier hybrid nature of CsPbBr3.
author_names: S Enomoto

Yusuke Ueda

Tomoya Tagami

Kentarou Fujiwara

Shun Takahashi

Kenichi Yamashita
title: Elucidation of lasing mechanism in all inorganic perovskite microcavity with exciton/free carrier hybrid nature
year: 2020

abstract: Inorganic perovskite lasers are of particular interest, with much recent work focusing on Fabry Perot cavity forming nanowires. We demonstrate the direct observation of lasing from transverse electromagnetic (TEM) modes with a long coherence time 9.5 ps in coupled CsPbBr 3 quantum dots, which dispense with an external cavity resonator and show how the wavelength of the modes can be controlled via two independent tuning mechanisms. Controlling the pump power allowed us to fine tune the TEM mode structure to the emission wavelength, thus providing a degree of control over the properties of the lasing signal. The temperature tuning provided an additional degree of control over the wavelength of the lasing peak, importantly, maintained a constant full width at half maximum (FWHM) over the entire tuning range without mode hopping.
author_names: Youngsin Park

Guanhua Ying

Atanu Jana

Vitaly Osokin

Claudius C Kocher

Tristan Farrow

Robert A Taylor

Kwang Sig Kim
title: Coarse and fine tuning of lasing transverse electromagnetic modes in coupled all inorganic perovskite quantum dots
venue: Nano Research
year: 2020

abstract: DOI: 10.1002/adom.202001235 stability leading to tolerance toward chemical environment, temperature, and light exposure.[11,12] Despite this, a remaining key vulnerability is from water due to the highly ionic structure of perovskites,[13] which can cause problems in realistic devices. Passivation methods using zwitterions,[14] organic inorganic hybrid ion pairs[15] and metal oxides[16 18] show promise in waterrelated stabilization. Even water itself can be used in some synthesis techniques.[19 22] While the room temperature characteristics have been well studied, investigations at cryogenic temperatures are essential to gain a proper understanding of the physics underpinning the origin of any induced qualitative improvements. Studies into inorganic perovskite nanocrystals[23,24] as well as nanowires[25] at low temperatures indeed lead to interesting optical phenomena and interpretations of carrier level physics. Here, we present the direct observation of interface states and defect lasing sites from Pb(OH)2 coated CsPbBr3 micro/ nano rods with different diameters. The fully inorganic rods with hydroxide cladding are prepared as described in detail in a previous growth paper.[26] A temperature dependent study shows that the passivated surface states are very robust against thermal effects and the photoluminescence (PL) peak intensity only drops by a factor of 1.5 from 4 K to room temperature. A comparison of the interface emission to uncoated CsPbBr3 also provides a link between the modified spectrum and the original CsPbBr3 emission. Localized defect emission sites are seen within thicker rods at low temperature, which are shown to exhibit bright stimulated emission through an electron hole plasma. We also present a direct observation of diffusion from both interface and defect sites using a confocal micro PL (mPL) mapping system with separable excitation and collection regions to further support our conclusions.
author_names: Guanhua Ying

Atanu Jana

Vitaly Osokin

Tristan Farrow

Robert A Taylor

Youngsin Park
title: Highly Efficient Photoluminescence and Lasing from Hydroxide Coated Fully Inorganic Perovskite Micro/Nano Rods
year: 2020

abstract: All inorganic lead halide perovskites are ideal platforms to investigate the fundamental physics of the light matter interactions, due to their strong oscillator strength at room temperature and va.
author_names: Feiyi Lyu

Hu Wang

Zhanghai Chen
title: Transition Between Exciton Polariton and Coherent Photonic Lasing in All Inorganic Perovskite Microcuboid
year: 2020

abstract: Perovskite is an excellent gain medium with tightly confined sub micrometer cavity structure, but the stability is a great challenge for perovskite microcavity lasers. At present, almost all perovskite microcavity lasers are operated at room or low temperature. Achieving high temperature lasing emission, especially single mode lasing, is quite difficult. In this paper, on the basis of the 3D CsPbBr3 microcubic cavity with high crystal quality, low threshold, and great light confinement, we first improve the operational temperature to 440 K in a perovskite material system. Upconverted single mode lasing with stable output and high quality can be obtained. The improved operational temperature tolerance of the CsPbBr3 microcubic cavity makes a step toward integrated high power density optoelectronic devices and further electrically driven lasers. In addition, by the finite element method, the mode distributions of such a 3D CsPbBr3 microcubic cavity are analyzed systematically and clearly physical diagrams o.
author_names: Beier Zhou

Mingming Jiang

Hongxing Dong

Weihao Zheng

Yong-Zhen Huang

Jun-yuan Han

Anlian Pan

Long Zhang
title: High Temperature Upconverted Single Mode Lasing in 3D Fully Inorganic Perovskite Microcubic Cavity
venue: ACS Photonics
year: 2019

abstract: 2D Ruddlesden Popper perovskites (RPPs) have aroused growing attention in light harvesting and emission applications owing to their high environmental stability. Recently, coherent light emission of RPPs was reported, however mostly from inhomologous thin films that involve cascade intercompositional energy transfer. Lasing and fundamental understanding of intrinsic laser dynamics in homologous RPPs free from intercompositional energy transfer is still inadequate. Herein, the lasing and loss mechanisms of homologous 2D (BA)2 (MA)n 1 Pbn I3 n +1 RPP thin flakes mechanically exfoliated from the bulk crystal are reported. Multicolor lasing is achieved from the large n RPPs (n 3) in the spectral range of 620 680 nm but not from small n RPPs (n 2) even down to 78 K. With decreasing n, the lasing threshold increases significantly and the characteristic temperature decreases as 49, 25, and 20 K for n 5, 4, and 3, respectively. The n engineered lasing behaviors are attributed to the stronger Auger recombination and exciton phonon interaction as a result of the enhanced quantum confinement in the smaller n perovskites. These results not only advance the fundamental understanding of loss mechanisms in both inhomologous and homologous RPP lasers but also provide insights into developing low threshold, substrate free, and multicolor 2D semiconductor microlasers.
author_names: Yin Liang

Qiuyu Shang

Qi Wei

Liyun Zhao

Zhen Liu

Jia-Yuan Shi

Yangguang Zhong

Jun Chen

Yan Gao

Meili Li

Xinfeng Liu

Guichuan Xing

Qing Zhang
title: Lasing from Mechanically Exfoliated 2D Homologous Ruddlesden Popper Perovskite Engineered by Inorganic Layer Thickness.
venue: Advanced materials
year: 2019