Metal Halide Perovskites for Laser Applications

Lei, Lei; Dong, Qin; Gündoğdu, Kenan; So, Franky

doi:10.1002/adfm.202010144

Cited by 223 publications

(173 citation statements)

References 165 publications

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“…Organic-inorganic halide perovskites (OIHPs) such as MAPbI 3 have been widely studied worldwide in recent years owing to their fascinating properties. [1][2][3][4][5] For instance, the power conversion efficiency of OIHP-based solar cells is being rapidly enhanced and is approaching that of single-crystal silicon solar cells. [6,7] In addition, considerable progress has been made in the development of OIHP-based photodetectors and LEDs, [8,9] RPPs has been proven to be fairly weak because bulky organic molecules can easily block the diffusion of heat.…”

Section: Introductionmentioning

confidence: 99%

Superior Performance and Stability of 2D Dion–Jacobson Halide Perovskite Photodetectors Operated under Harsh Conditions without Encapsulation

Lai

Wang

Meng

et al. 2021

Advanced Optical Materials

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The practical utilization of electronic and optoelectronic materials such as perovskites not only relies on their good device performance and moisture stability but also requires stability under other operating conditions. Herein, the operational stability of the Dion–Jacobson perovskite (DJP) photodetector under different harsh conditions is carefully studied and compared with that of its widely studied counterpart, i.e., the Ruddlesden–Popper perovskite (RPP) photodetector. The DJP‐based photodetector can maintain its responsivity after storage in humid environments for two months and can ensure stable operation without any photocurrent degradation under continuous light illumination for 20 000 s. Moreover, the DJP film does not exhibit any changes in its absorbance spectrum and surface morphology when it is heated at 100 °C for 18 h, and the film is hardly affected by high‐energy electron beam irradiation. In addition, the mechanical stability of the DJP film is also found to be superior based on the cyclic bending measurements of the fabricated flexible photodetectors. The excellent performance and stability of the DJP‐based photodetector are found to be the result of the elimination of weak van der Waals bonds among the octahedral PbI4 layers of DJP films, which is typically observed in RPP films.

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Section: Introductionmentioning

confidence: 99%

Superior Performance and Stability of 2D Dion–Jacobson Halide Perovskite Photodetectors Operated under Harsh Conditions without Encapsulation

Lai

Wang

Meng

et al. 2021

Advanced Optical Materials

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“…Both lasing and ASE are a kind of light amplification through stimulated emission when there is an inverted population between two energy states. [ 7 ] Stimulated emission is that an incident single photon stimulates other recombination and creates an additional photon which is exactly the same as oneself. [ 8 ] When the excitation fluence exceeds a certain threshold and population inversion is achieved, the probability of generating stimulated emission is greater than that of absorption for an incident photon, thus realizing light amplification and optical gain.…”

Section: Introductionmentioning

confidence: 99%

Mixed Halide Perovskite Films by Vapor Anion Exchange for Spectrally Stable Blue Stimulated Emission

Chen

Fang

et al. 2021

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All-inorganic perovskites such as CsPbX 3 have attracted huge attention because of its superior stability. [6] So far, perovskite nanowires, microplates, and films have been used to realize lasing or amplified spontaneous emission (ASE). Both lasing and ASE are a kind of light amplification through stimulated emission when there is an inverted population between two energy states. [7] Stimulated emission is that an incident single photon stimulates other recombination and creates an additional photon which is exactly the same as oneself. [8] When the excitation fluence exceeds a certain threshold and population inversion is achieved, the probability of generating stimulated emission is greater than that of absorption for an incident photon, thus realizing light amplification and optical gain. ASE or lasing will occur only if optical gain is larger than optical loss. [7a] Unlike lasers, ASE does not require a resonant cavity. [7b,9] That is, it is necessary to construct the resonant cavity for the transformation from ASE to lasing. Remarkably, perovskite nanowires [10] and microplates [11] can use their own nanostructures as resonant cavities to amplify light and achieve lasing. However, the difficulties in precise position control largely limit their integration with other optical and electrical devices. [12] By contrast, perovskite films are simple to prepare and easy to integrate with other optical and electronic devices. [12,13] Lasing or ASE based on CsPbX 3 films have been demonstrated in red and green spectral regions. [6b,13,14] However, there are few report about blue lasing or ASE based on CsPbX 3 film. The factors restricting the realization of blue lasing or ASE are the preparation of high-quality films and the improvement of spectral stability. On the one hand, the low solubility of chlorine sources such as CsCl in the precursor aggravates the fabrication of the films, [15] which lead to poor quality of films and more scattering losses. On the other hand, the mixed halides perovskites generally undergo ion migration under the stimuli of light or electric filed, resulting in phase separation and spectral instability. [16] Especially, ion migration will be more obvious under high flux excitation needed for reaching population inversion. [17] Therefore, it's of great significance to prepare high-quality thin films with good spectral stability for blue ASE or laser.In this work, we demonstrate blue ASE from mixed-Br/Cl quasi-2D Cs-based perovskite films prepared by a facile vapor anion exchange (VAE) method. Unlike the method of directly Solution-processed all-inorganic CsPbX 3 perovskites exhibit outstanding optoelectronic properties and are being considered as a promising optical gain medium, with impressive performance in the green and red region. However, the development of CsPbX 3 for blue emission is still lagging far behind, owing to difficulties in thin films synthesis and spectral instability subject to light irradiation. Here, a facile vapor anion exchange (VAE) method that enables pr...

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“…With the similar conditions of PeLEDs, the application of lasers based on perovskites faces an urgent need for higher efficiency and stablity. [9,189] At the large density of excited carriers, the stimulated emission of perovskite materials mainly involves bimolecular radiative recombination and Auger recombination. [9] Therefore, optimizing the film morphology and decreasing defects could also guide the progress of laser.…”

Section: Down-conversionmentioning

confidence: 99%

“…In addition, their cost-effective solution synthesis process facilitates the massive fabrication for prospective commercial applications. [5,6] These superior properties make them widely applied for diverse optoelectronic applications, [7][8][9][10][11][12] including solar cells, lasers, photodetectors, and light-emitting diodes (LEDs). Specifically, owing to the compelling emission features, they are deemed as ideal next-generation fluorescent materials for high-quality full-color display and lighting.…”

Section: Introductionmentioning

confidence: 99%