Size- and temperature-dependent photoluminescence spectra of strongly confined CsPbBr₃ quantum dots

Abstract

Lead-halide perovskite nanocrystals (NCs) are receiving much attention as a potential high-quality source of photons due to their superior luminescence properties in comparison to other semiconductor NCs.

Guidelines for the characterization of metal halide nanocrystals

“…The study of the physical properties of MH NCs is a vivid field of research relying on various continuous-wave and time-resolved optical spectroscopies performed under controlled temperature [55][56][57][58][59][60] and environmental conditions [61][62][63] at both the ensemble and the single-particle level (Figure 4) [64][65][66][67]. This enables us to build a comprehensive photophysical picture including the bandgap energy [20,27], the emission spectrum and its excitonic versus defect/dopantbased contributions [6,[68][69][70][71][72], the exciton [73] and biexciton binding energies [74], and the rates of radiative and nonradiative processes in single NC and ensembles [75][76][77] and in hybrid architectures [78][79][80][81][82], as well as the extent of blinking processes and single-photon emission properties [64][65][66][67] (Figure 4).…”

“…Because of the small Stokes shift in LHP NCs, reabsorption might lead to underestimation of the PLQY of highly concentrated samples [84]. Finally, important aspects to consider are the sample temperature, which determines the efficiency of multiphonon nonradiative decay channels as well as carrier trapping [56][57][58]69], and the choice of the excitation wavelength, as hot carriers have a probability of being trapped in intraband defect states before they reach the band edges.…”

Shaping and enhancing the photoluminescence of halide perovskite quantum dots with plasmonic lattices

“…The emission wavelength can be determined by the size of the PeQDs and is tuned in a wide range of the visible spectrum when the particle size is homogeneous and below the Bohr exciton diameter, 31 which has been reported to be 7.0 nm for CsPbBr 3 . 34,35 It is accepted that particles with size below this value present strong quantum confinement. Therefore, we associate the absorption peak around 480 nm with the strong quantum confinement of the particles with size below the Bohr diameter, which cause a Stokes shift of around 40 nm.…”

Integration of Highly Luminescent Lead Halide Perovskite Nanocrystals on Transparent Lead Halide Nanowire Waveguides through Morphological Transformation and Spontaneous Growth in Water

“…[1][2][3][4][5][6] Even although a few integration techniques have been developed over the years, for example, by physically placing nanocrystals to a waveguide, [4,7,8] chemically adsorption of nanocrystals on a waveguide, [9,10] or using e-beam lithography [11,12] to define and control relative position of nanocrystals and waveguides, the integration still remains challenging, since it involves precise manipulation of nanoscale objects. All-inorganic lead halide perovskite CsPbBr 3 quantum dots, because of their nearly 100% quantum efficiency, [13,14] have emerged as an ideal candidate for nonclassical light source. [10,[15][16][17][18][19] In particular, by integrating quantum dots with a waveguide, a single photon quantum source has been demonstrated.…”