Optical Spectroscopy of Single Colloidal CsPbBr₃ Perovskite Nanoplatelets

Abstract

Optically bright lead halide perovskite nanocrystals of different morphologies ranging from nanocubes to flat nanoplatelets to elongated nanowires have been reported. The morphology of the nanocrystals is expected to affect various properties such as the band edge energy and the electron–hole exchange interaction. However, aside from nanocubes, the investigation of optical properties in the lead halide perovskite nanocrystals of different morphologies at the single emitter level has been lacking. We have performed optical spectroscopy in single CsPbBr3 nanoplatelets and observed single photon emission without blinking. Furthermore, the photoluminescence emission exhibits excitonic fine structure peaks similar to what has been previously observed in nanocubes. Our work stimulates further investigations into the excitonic and quantum optics properties when the lateral size and morphology can be further controlled in lead halide perovskite nanocrystals.

Anisotropic shape of CsPbBr3 colloidal nanocrystals: from 1D to 2D confinement effects

“…Figure 1c summarizes also our results and those obtained by several authors. 26,27,[29][30][31] First we underline that a very good agreement is found for 9 MLs (5.22 nm) 26 and for 6 MLs (3.48 nm). 29 However, the disagreement is important with data of reference 31 for almost all thickness values and these data are also very different from other data.…”

“…Multi-layered organic perovskite (like Ruddlesden-Popper halide perovskites) are natural 2D systems, with confinement effects along one direction. 18,19 In addition, several efforts have also been done to synthesize organic/inorganic NPLs [20][21][22][23] and nanowires, 22,24 or all-inorganic NPLs [25][26][27][28][29][30][31] as well as nanowires. 26,32,33 Long nanowires can be cut to obtain nanoobjects with two confinement directions leading to nanorods or nanosticks (NSTs).…”

“…From the linear fit (red line) to the absorption data shown in figure (b), the interplanar distance a ≈ 0.58 nm is obtained. Room-temperature absorption results from other groups are also represented.Note that reference[31] refers to photoluminescence results at 5 K.…”

Exciton binding energy and effective mass of CsPbCl3: a magneto-optical study

“…As a direct bandgap semiconductor, lead halide perovskite exhibits also excellent electronic and emission properties, very interesting for optoelectronic applications as lasers and photodiodes [4][5][6][7], photodetectors [8] or polaritonic devices [9][10][11][12][13]. In addition, the flexible synthesis of nanostructures such as nanocrystals or nanoplatelets, offers numerous opportunities for their integration in quantum devices and the development of applications in the field of quantum optics [14,16].…”

Transient circular dichroism and exciton spin dynamics in all-inorganic halide perovskites

“…etal halide perovskites (MHPs) with general formula of ABX 3 (where A is an organic or inorganic cation, B = Pb, and X = Cl, Br, or I) are semiconducting materials with exceptional optical and electrical properties [1][2][3][4][5][6][7][8][9][10][11] . In the past few years, tremendous progress has been made for developing highperformance optoelectronic and photonic devices based on MHPs, such as solar cells 3 , light-emitting diodes 8 , and lasers 2,5,12,13 , demonstrating great promise towards practical applications.…”