Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-27-7-9459
Timestamp: 2019-04-25 23:43:31+00:00

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Perovskites have emerged as a class of cutting-edge light-emitting materials; however, their poor stability, due to the high sensitivity to moisture in the ambient environment, severely hinders their further application. Here, to obtain stable perovskite-based laser with excellent optical performance, all-inorganic perovskite CsPbBr3 quantum dots (QDs) evenly distributed into sub-micro silica sphere (CsPbBr3-SiO2) have been used as laser gain medium. The single silica sphere embedded by plentiful CsPbBr3 QDs demonstrates frequency up-converted lasing with compounded mode of random and whispering-gallery-mode (WGM) at room temperature. Furthermore, by incorporating the CsPbBr3-SiO2 spheres into a microtubule, the frequency up-converted WGM lasing has been successfully achieved under two-photon excitation. Notably, the CsPbBr3-SiO2 microtubule resonator exhibits a low lasing threshold of 430 μJ/cm2, mostly due to the enhanced gain for CsPbBr3 QDs inside the silica sphere. Moreover, stable WGM lasing is observed under continuous optical pump for 140 min, benefited from the protection of silica shells, which isolate the QDs from the environmental conditions. The enhanced lasing performance provides an effective way for further exploration and application of perovskite-based micro/nano photonic devices.
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Fig. 1 (a) Schematic of the CsPbBr3-SiO2 formation. (b) TEM image of pure CsPbBr3 QDs. The scale bar is 50 nm. (c) TEM image of single CsPbBr3/SiO2 sphere. The scale bar is 1 μm. (d) Magnified TEM image at edge of CsPbBr3-SiO2 sphere embedded by an ocean of QDs. The scale bar is 100 nm. (e) XRD patterns of the CsPbBr3, and CsPbBr3-SiO2 sphere, respectively. (f) UV−vis extinction and PL emission spectrum of CsPbBr3 (blue color) QDs and CsPbBr3-SiO2 (red color) sphere, respectively.
Fig. 2 (a) EDS of the CsPbBr3-SiO2 sphere. (b)-(d) Element mapping images obtained from EDS for elements Cs, Pb, and Br, respectively. All the scale bar is 500 nm.
Fig. 3 (a) Schematic diagram for measuring CsPbBr3-SiO2 QDs lasing. The green circle and gradient arrows indicate the light propagation inside the cavity. (b) Emission spectra with increasing pump intensity under two-photon excitation. The inset shows the magnified view of the lasing spectra and the arrow indicates a regular peak with slight blue shift. (c) Log–log plot of the output intensity as a function of pump intensity.
Fig. 4 (a) Lasing image of a cylindrical microtubule incorporated with CsPbBr3/SiO2 QDs. The inset shows the WGM supported by the micro-ring resonator. (b) Emission spectra with increasing pump intensity. (c) Log–log plot of the output integral intensity as a function of pump intensity. (d) Lasing modes estimated with the WGM model. (e) Gauss fitting of a selected lasing peak with FWHM ~0.35 nm, corresponding Q ~1532. (f) Lasing intensity as a function of operated time or excitation shots under 800 nm.

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