Mode selection and high-quality upconversion lasing from perovskite CsPb<sub>2</sub>Br<sub>5</sub> microplates

Zhengzheng Liu; Zhengzheng Liu; Chunwei Wang; Chunwei Wang; Chunwei Wang; Zhiping Hu; Zhiping Hu; Juan Du; Juan Du; Juan Du; Juan Du; Jie Yang; Zeyu Zhang; Zeyu Zhang; Tongchao Shi; Tongchao Shi; Weimin Liu; Xiaosheng Tang; Xiaosheng Tang; Yuxin Leng; Yuxin Leng; Yuxin Leng; Yuxin Leng; Yuxin Leng

doi:10.1364/PRJ.399960

Photonics Research
Vol. 8,
Issue 9,
pp. A31-A38
(2020)
•https://doi.org/10.1364/PRJ.399960

Mode selection and high-quality upconversion lasing from perovskite CsPb₂Br₅ microplates

Zhengzheng Liu, Chunwei Wang, Zhiping Hu, Juan Du, Jie Yang, Zeyu Zhang, Tongchao Shi, Weimin Liu, Xiaosheng Tang, and Yuxin Leng

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Zhengzheng Liu, Chunwei Wang, Zhiping Hu, Juan Du, Jie Yang, Zeyu Zhang, Tongchao Shi, Weimin Liu, Xiaosheng Tang, and Yuxin Leng, "Mode selection and high-quality upconversion lasing from perovskite CsPb₂Br₅ microplates," Photon. Res. 8, A31-A38 (2020)

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Abstract

In recent years, halide perovskite nanostructures have had great advances and have opened up a bright future for micro/nanolasers. However, upconversion lasing by two-photon excitation with mode selection and high quality factor in one device is still rarely reported. Herein, two lasing modes are demonstrated in the all-inorganic perovskite ${CsPb}_{2} {Br}_{5}$ microplates with subwavelength thickness and uniform square shape. The net optical gain is quickly established in less than 1 ps and persists more than 30 ps, revealed by ultrafast transient absorption spectroscopy. The temperature-dependent low-threshold amplified spontaneous emission confirms the net gain for stimulated emission with a high characteristic temperature of 403 K, far surpassing the all-inorganic ${CsPbBr}_{3}$ semiconductor gain media. Remarkably, upconversion lasing based on two kinds of microcavity effects, Fabry–Pérot and whispering-gallery modes, from the microplates at room temperature is successfully achieved with a low threshold operating in multi- or single-mode, respectively. Surprisingly, the quality factor ( $\sim 3551$ ) is among the best values obtained from perovskite micro/nanoplate upconversion lasers without an external cavity. Moreover, the highly stable chromaticity with color drift only less than 0.1 nm also outbalances the all-inorganic ${CsPbBr}_{3}$ ones. These superior performances of ${CsPb}_{2} {Br}_{5}$ microplate lasing with a facile solution synthesis procedure will offer a feasible structure to fabricate specific functionalities for high-performance frequency upconversion micro/nanoscale photonic integrated devices.

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Fig. 1. Optical characterizations of perovskite

{CsPb}_{2} {Br}_{5}

microplates. (a) SEM image. The scale bar is 10 μm. (b) Schematic crystal structure. (c) Experimental and standard powder XRD patterns of tetragonal

{CsPb}_{2} {Br}_{5}

. (d) Linear absorption (green) and PL spectrum (red).

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Fig. 2. TA spectra of perovskite

{CsPb}_{2} {Br}_{5}

. (a) 2D pseudo-color TA spectra. (b) TA spectra at different delay times. (c) The kinetics of prominent PB signal. (d) The kinetics of SE. Inset: a magnified view of the spectroscopic signature of SE before 11 ps.

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Fig. 3. Temperature-dependent ASE actions from

{CsPb}_{2} {Br}_{5}

microplates. (a) The PL spectra of two-photon pumped ASE at 300 K. Inset: photograph of the

{CsPb}_{2} {Br}_{5}

microplate excited above ASE threshold by a cylindrical lens. (b) The integrated intensity and FWHM with respect to pump intensity. (c) Normalized PL intensity as a function of excitation intensity at different temperatures. (d) Pump threshold intensity versus temperature. The solid red line is the fit according to Eq. (1).

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Fig. 4. F-P mode lasing characterization of a single

{CsPb}_{2} {Br}_{5}

microplate. (a) Pump-intensity-dependent emission spectra under two-photon excitation. Inset: the bright-field optical image and emission photograph from the single microplate above the lasing threshold, indicating the F-P mode. The scale bar is 5 μm. (b) Output intensity (blue) and FWHM (red) of laser with increasing pump fluence. (c) Fitting of the lasing oscillation mode. The FWHM is 0.15 nm with a quality factor of

\sim 3551

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Fig. 5. WGM lasing characterization of a single

{CsPb}_{2} {Br}_{5}

microplate. (a) Pump-intensity-dependent emission spectra under two-photon excitation. Inset: the bright-field optical image and the emission photograph from the single

{CsPb}_{2} {Br}_{5}

microplate above the lasing threshold, indicating the WGM lasing. The scale bar is 5 μm. (b) Output intensity (red) and FWHM (blue) of laser with increasing pump fluence. (c) Fitting of the lasing oscillation mode. The FWHM is 0.16 nm with a quality factor of