Circularly Polarized Luminescence of CsPbBr3 Quantum Dots Induced by Chiral Phenylethylamine Ligands
Oleylamine(OAm),dodecylamine(DDA),octylamine(OA),and chiral phenylethylamine(PEA)were selected as amine ligands with different chain lengths for CsPbBr3 quantum dots.It was observed that the introduction of chiral PEA ligands resulted in the highest photoluminescence quantum yield(PLQY)of 44.9%,and circularly polarized luminescence was presented with a luminescence dissymmetry factor(glum)of 0.005.Further,the quantum dots were co-passivated at different molar ratios of chiral PEA to non-chiral OAm,DDA,or OA.In the case of the PEA proportion of 75%,both PLQY and glum were the highest.A PLQY of 70.1%and glum values of-0.027/+0.025 were obtained at a 3∶1 ratio of chiral PEA to non-chiral OA.
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