High-Efficiency Fast-Radiative Blue-Emitting Perovskite Nanoplatelets and Their Formation Mechanisms

Abstract

High-efficiency blue perovskite emitters with fast fluorescence radiation are not only crucial to achieving high-quality displays but also highly desired for optical wireless communications and quantum information technologies. Here, we demonstrate the preparation of blue-emitting Eu 3+ -, Sb 3+ -, and Ba 2+ -induced CsPbBr 3 nanoplatelets with narrow spectral widths. Among them, Sb 3+ -doped CsPbBr 3 NPLs can reach a photoluminescence quantum yield of 95%, with a very short fluorescence lifetime of 1.48 ns and greatly reduced ligand dosage. Through nuclear magnetic resonance analysis and density functional theory calculations, we find that the dopant−ligand interaction and dopant-induced growth energy barrier decide the growth kinetics of doped nanoplatelets. These mechanisms offer a fresh route to controlling the dimension of nanoscale perovskite emitters and benefit the development of fast-radiative perovskite emitters.

A Comprehensive Review on Mechanisms and Applications of Rare‐Earth Based Perovskite Nanocrystals†

“…prepared Eu 3+ ‐doped CsPbBr 3 to achieve the transformation of nanocrystals to nanosheets and achieved a better monochromatic blue luminescence at 463 nm with a FWHM of only 16 nm. [ 110 ] This surface coordination mechanism of CsPbBr 3 :Eu 3+ NPL essentially uses stronger coordination between dopants, halide octahedra and ligands to inhibit the growth of oriented crystal planes, as shown in Figure 19 (a).…”

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

“…Both isovalent (Mn 2+ , [65][66][67][68][69] Ni 2+ , [70] Sn 2+ , [60] Cu 2+ , [25] Ba 2+ , [71] Zn 2+ [25] ) and heterovalent (Sn 4+ , [60,72] Ti 4+ , [60] Sb 3+ , [14,71] Eu 3+ , [25,71] Ce 3+ , Tb 3+ , [73] Lu 3+ , Nd 3+ , Gd 3+ , [74] and Yb 3+ [75,76] ) cations have been introduced into perovskite NPls as B-site dopants by following the above-mentioned approaches, as will be discussed in detail in the next subsections. First, in situ and ex situ approaches for perovskite NPls will be considered.…”

“…[74] Zhou et al observed that the addition of EuBr 3 , SbBr 3, or BaBr 2 into a precursor mixture during the LARP synthesis induced anisotropic growth of square-like 5ML doped CsPbBr 3 NPls. [71] They proposed that different mechanisms should be responsible for the anisotropic growth of different dopants: while in the case of Eu 3+ and Ba 2+ doping, a suppressed growth in 1D resulted from the hard/soft − acid/base principle, Sb 3+ dopant hindered the formation of mixed 5 ML / 6 ML NPls due to the enhanced growth energy barrier. The obtained Sb 3+ -doped CsPbBr 3 NPls possessed a short PL lifetime of 1.48 ns, a high exciton binding energy of 202 meV, and maintained a high PL QY of 95% after three purification cycles.…”

Thickness-Dependent Photoluminescence Properties of Mn-Doped CsPbBr3 Perovskite Nanoplatelets Synthesized at Room Temperature

“…Recently, impurity ion doping has gained significant attention for its ability to control the optical properties of perovskite NPLs. − Among various dopants, Mn 2+ is the most widely investigated. − It is well-established that the introduction of Mn 2+ ions into the host material leads to the emergence of new magnetic and optical properties. This process involves energy transfer from excitons within the host to Mn 2+ ions, resulting in the emission of orange-red light due to the spin-forbidden 4 T 1 → 6 A 1 Mn 2+ d-d transition.…”