Mirror‐Image Magnetic Circularly Polarized Luminescence from Perovskite (M⁺Pb²⁺Br₃, M⁺=Cs⁺ and Amidinium) Quantum Dots

Abstract

Ambidextrous magnetic circularly polarized luminescence (MCPL) and redshift in photoluminescence (PL) spectra are observed from two types of achiral soluble diamagnetic perovskite‐Pb‐quantum dots in toluene solution at room temperature, when subjected to external north‐up and south‐up magnetic fields of 1.7 T. The magnitude of the MCPL, gMCPL, is in the order of |gMCPL|=10−3 within a wavelength range of 480–580 nm. The wavelength and the sign of the MCPL spectra can be controlled by the types of perovskite constituent atom and the direction of the magnetic field, respectively.

Multi‐Color Magnetic Circularly Polarized Luminescence from Achiral Perovskite (Cs+Pb2+X3) Quantum Dots

“…[41][42] Figure 1. PL in (a) PVQD-1 in hexane, (b) PVQD-2 in toluene, [34] MCPL, CPL, MPL, and PL spectra of PVQD-1 excited at 332 nm in hexane (1.0×10 À 3 M), PVQD-2 excited at 360 nm in toluene (1.0×10 À 3 M), [34] and PVQD-3 excited at 329 nm in octane (1.0×10 À 3 M) under N-up (red lines) and S-up (blue lines) directions of the Faraday geometries under a 1.7 T magnetic field and without a magnetic field (black lines).…”

“…For all PVQDs, negative (À ) MCPL (red lines) was obtained for the N-up shape Table 1. MCPL properties of PVQD-1 in hexane (1.0×10 À 3 M), PVQD-2 in toluene (1.0×10 À 3 M), [34] and PVQD-3 in octane (1.0×10 À 3 M) under a 1.7 T magnetic field at 25 °C. and positive (+) MCPL (blue lines) was obtained for the S-up shape.…”

“…[26][27][28][29][30][31][32] Recently, we demonstrated efficient MCPL extraction from (i) pyrene as an achiral organic luminescent material, (ii) racemic EuIII(hfa) 3 and TbIII(hfa) 3 (hfa: hexafluoroacetylacetonate) as optically inactive organic-inorganic hybrid luminescent materials, and (iii) Y 2 O 3 /Eu(III) and Pb-perovskite QDs CH 5 N 2 PbBr 3 as achiral inorganic luminescent materials in dilute solution and the solid state at 25 °C by applying an approximately 1.6 T external magnetic field. [30,33,34] Among these light-emitting materials, metal halide perovskite semiconductors, which have a special crystal structure called the perovskite structure, have attracted worldwide attention as low-cost, high-efficiency, and especially flexible optical device materials. High quality thin films of metal halide perovskite semiconductors can be fabricated at relatively low temperatures via a simple coating process.…”

Magnetic Circularly Polarized Luminescence of Organic Compounds

“…The first observation of MCPL was carried out at the end of the XIX century by Pieter Zeeman, who observed the phenomenon in the emission of atomic Cd. [10] A few examples of MCPL of lanthanide complexes, [11] d-block metal complexes or clusters, [12] perovskites, [13] etc. are reported in the literature since the 70's, while only a handful of MCPL-active organic molecules have been described so far.…”

Cascade energy transfer boosted near-infrared circularly polarized luminescence of nanofibers from an exclusively achiral system

“…5,6 Currently, there are few reports on the materials with near-infrared CPL activity. [7][8][9] Metal complexes modified with chiral ligands are generally used to generate CPL in the near-infrared region, but their g lum values are relatively small. 10 A few lanthanide metal complexes show high near-infrared CPL activity and g lum , but these molecules or their precursors are difficult to synthesize due to their complicated chiral structure.…”