Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites

Abstract

Metal halide semiconductors with perovskite crystal structures have recently emerged as highly promising optoelectronic materials. Despite the recent surge of reports on microcrystalline, thin-film and bulk single-crystalline metal halides, very little is known about the photophysics of metal halides in the form of uniform, size-tunable nanocrystals. Here we report low-threshold amplified spontaneous emission and lasing from ∼10 nm monodisperse colloidal nanocrystals of caesium lead halide perovskites CsPbX3 (X=Cl, Br or I, or mixed Cl/Br and Br/I systems). We find that room-temperature optical amplification can be obtained in the entire visible spectral range (440–700 nm) with low pump thresholds down to 5±1 μJ cm−2 and high values of modal net gain of at least 450±30 cm−1. Two kinds of lasing modes are successfully observed: whispering-gallery-mode lasing using silica microspheres as high-finesse resonators, conformally coated with CsPbX3 nanocrystals and random lasing in films of CsPbX3 nanocrystals.

Lasing in robust cesium lead halide perovskite nanowires

“…Our initial study focused on CsPbBr 3 nanowires, as previous reports suggest this composition is strongly photoluminescent (26,34) and capable of stimulated emission (29)(30)(31). Although we have already reported the synthesis of colloidal CsPbBr 3 nanowires (34), those nanowires are too narrow (∼20-nm diameter) to efficiently confine the 535-nm emission and are therefore unable to support photonic lasing (Fig.…”

“…Whereas early studies revealed wide stoichiometric emission wavelength tunability (28), stimulated emission for all-inorganic perovskites was not reported until 2007 in thin films of CsPbBr 3 (29,30). Recent reports have expanded the versatility of the cesium lead halides by demonstrating amplified spontaneous emission in a variety of CsPbX 3 compositions and alloys, as well as whispering gallery mode lasing in coated silica beads and microcrystals (31)(32)(33). Whereas these recent works have highlighted the impressive properties of cesium lead halide perovskites in terms of their optical properties and tunability, the growth and characterization of cesium lead halide nanowires capable of lasing has not yet been achieved.…”

Polymer-Enhanced Stability of Inorganic Perovskite Nanocrystals and Their Application in Color Conversion LEDs

“…[1][2][3][4] Of high interest are their remarkable optical properties such as non-linear absorption, stimulated emission and blinking behavior. 2,[5][6][7] Compared to classical Cd-based chalcogenide quantum dots (QDs), CsPbX 3 (X = Cl, Br, I) offer a very broad and easily adjustable composition versatility together with ample options for shape control, which allow tuning of their emission wavelength throughout the whole visible spectrum. [8][9][10][11][12][13][14] Among other applications, such highly luminescent and spectrally tunable NCs are ideally suited to produce monochromatic and white LEDs (WLEDs).…”

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

“…Therefore, HPVKs layers have been successfully applied in a wide range of photonic devices, such as photodetectors [91,92] or light emitting diodes [90,93]. In addition, since HPVKs present a fast carrier formation and long recombination time, they are promising materials to reduce the stimulated emission threshold in active devices [94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109], as it has been nicely reviewed in [90].…”

“…Spherical perovskite nanocrystals have also been synthesized as a promising material to implement active devices. Yakunin et al studied the properties of CsPbX 3 colloidal perovskite nanoparticles and its incorporation in different photonics structures [105]. By altering the composition X it became possible to modify the bandgap between 450 and 700 nm (see Fig.…”