Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres

applications, such as solar cells, [1][2][3][4][5][6][7] lightemitting devices (LEDs), [8][9][10] photodetectors, [11][12][13] and lasers. [14][15][16][17] Regarding the solar cells, the diffusion of photogenerated carriers and photon recycling are the two possible energy transport pathways that could affect the internal carrier dynamics and device performances. [18][19][20][21] Both processes may cause a similar influence in the external emission wavelength. Whereas, their influences on carrier lifetime, external photoluminescence (PL) quantum yield (QY), as well as opencircuit voltage (V OC ) and efficiency of the solar cells are different. [18,19] Photon recycling refers to the regeneration of an excitation via the self-reabsorption of emission from recombining photogenerated charge pairs. [18] For solar cells, generally, the performance can be boosted by a highly efficient photon recycling process. [18][19][20][21] As demonstrated previously, photon recycling will boost an additional open-cir-) according to, [20] ln 1 1where k is the Boltzmann constant, q is the elementary charge of an electron, T C is the cell temperature, η IN is the internal quantum efficiency, and p r is the probability of photon recycling. On the other hand, for LEDs, strong photon recycling implies a low outcoupling probability (η esc ), which is detrimental for external efficiency. For example, an internal PL QY lower than 95% can result in an external PL QY lower than 50%. [18] Moreover, the photophysics behind photon recycling and carrier diffusion are different. The high photon recycling efficiency generally requires a large overlapping of its PL spectrum with the absorption spectrum, a strong photon confinement, and a high-internal PL quantum yield. [18][19][20] While long carrier diffusion length is ensured by long carrier lifetime, high carrier mobility, and low defect density. [22][23][24][25][26][27] These two energy transport pathways imply different applications, therefore, it is crucial to evaluate the contributions of photon recycling and carrier diffusion in lead halide perovskites.In perovskites, very long diffusion lengths exceeding 1 µm in solution-fabricated films and hundreds of micrometers in single crystals have been reported, [22][23][24][25][26][27] enabling the radiative recombination of charge carriers at positions far away from the excitation spot. On the other hand, due to the highly efficient band-to-band transitions, large absorption coefficients, Photon recycling and carrier diffusion are the two plausible processes that primarily affect the carrier dynamics in halide perovskites, and therefore the evaluation of the performance of their photovoltaic and photonic devices. However, it is still challenging to isolate their individual contributions because both processes result in a similar emission redshift. Herein, it is confirmed that photon recycling is the dominant effect responsible for the observed redshifted emission. By applying one-and two-photon confocal emission microscopy on Ruddlesden-Popper type ...

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confidence: 99%

The Dominant Energy Transport Pathway in Halide Perovskites: Photon Recycling or Carrier Diffusion?

Gan

Wen

Chen

et al. 2019

Advanced Energy Materials

105

116

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“…[ 105 ] c) Stability of laser emission of a CsPbBr 3 micro sphere in air pumped by a femtosecond laser with a density of 1.2 P th . [ 139 ] d) stability of room temperature laser emission of FAPbI 3 , MABr stabilized FAPbI 3 , and MAPbI 3 nanowires pumped by 402 nm pulsed laser (150 fs, 250 kHz). [ 74 ] e) The dependence of lasing spectrum of the hBN covered CsPbI 3 nanoplatelet on time.…”

Section: Stability Of Optically Pumped Perovskites Light Sourcesmentioning

confidence: 99%

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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“…The fact of fast reaction between free radicals and dye molecules indicates the unique catalytic properties of the Cs 2 AgBiBr 6 surface.D eposition of metal clusters onto Cs 2 AgBiBr 6 effectively enhances the photocatalytic activity.A lthough the stability (five consecutive photocatalytic cycles without obvious decrease of efficiency) requires further improvements,t he results indicate the significant potential of Cs 2 AgBiBr 6 -based photocatalysis.Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. However,t he poor stability and the low photocatalytic activity of halide perovskites prevent use of these defect-tolerant materials in wide applications involving photocatalysis.H ere,a na lcohol-based photocatalytic system for dye degradation demonstrated high stability through the use of double perovskite of Cs 2 AgBiBr 6 .T he reaction rate on Cs 2 AgBiBr 6 is comparable to that on CdS,amodel inorganic semiconductor photocatalyst.…”

mentioning

confidence: 99%

“…Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. [6] Specifically,t he power conversion efficiencyo fl ead-based halide perovskite based solar cells has steadily risen from 3.8 [7] to 23.3 %.…”

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confidence: 99%

Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs₂AgBiBr₆

et al. 2019

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Composition engineering of halide perovskite allows the tunability of the band gap over awide range so that photons can be effectively harvested, an aspect that is of critical importance for increasing the efficiency of photocatalysis under sunlight. However,t he poor stability and the low photocatalytic activity of halide perovskites prevent use of these defect-tolerant materials in wide applications involving photocatalysis.H ere,a na lcohol-based photocatalytic system for dye degradation demonstrated high stability through the use of double perovskite of Cs 2 AgBiBr 6 .T he reaction rate on Cs 2 AgBiBr 6 is comparable to that on CdS,amodel inorganic semiconductor photocatalyst. The fact of fast reaction between free radicals and dye molecules indicates the unique catalytic properties of the Cs 2 AgBiBr 6 surface.D eposition of metal clusters onto Cs 2 AgBiBr 6 effectively enhances the photocatalytic activity.A lthough the stability (five consecutive photocatalytic cycles without obvious decrease of efficiency) requires further improvements,t he results indicate the significant potential of Cs 2 AgBiBr 6 -based photocatalysis.Lead halide perovskites have demonstrated great potential for optoelectronic applications such as solar cells, [1] light emitting diodes (LEDs), [2] lasers, [3] photoelectrodes, [4] and optical sensors [5] because of their high extinction coefficients, optimal band gaps,h igh photoluminescence quantum yields, and long electron/hole diffusion lengths. [6] Specifically,t he power conversion efficiencyo fl ead-based halide perovskite based solar cells has steadily risen from 3.8 [7] to 23.3 %. [8] The electronic band structure (conduction band edge and valence band edge positions) of halide perovskite materials also promises efficient photocatalytic applications.Recently,photocatalytic hydrogen evolution, [9] photocatalytic reduction of CO 2

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Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres

Cited by 251 publications

References 53 publications

The Dominant Energy Transport Pathway in Halide Perovskites: Photon Recycling or Carrier Diffusion?

The Dominant Energy Transport Pathway in Halide Perovskites: Photon Recycling or Carrier Diffusion?

Stability of Perovskite Light Sources: Status and Challenges

Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs₂AgBiBr₆

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Single-Mode Lasers Based on Cesium Lead Halide Perovskite Submicron Spheres

Cited by 251 publications

References 53 publications

The Dominant Energy Transport Pathway in Halide Perovskites: Photon Recycling or Carrier Diffusion?

The Dominant Energy Transport Pathway in Halide Perovskites: Photon Recycling or Carrier Diffusion?

Stability of Perovskite Light Sources: Status and Challenges

Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs2AgBiBr6

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Stable and Highly Efficient Photocatalysis with Lead‐Free Double‐Perovskite of Cs₂AgBiBr₆