Tailoring of energy levels in lead chloride based layered perovskites and energy transfer between the organic and inorganic planes

Pressure dependence of phosphorescence through energy transfer from inorganic quantum well to naphthalene chromophore in (C10H7C2H4NH3)2PbCl4

“…In our experiment, the fluorescence from the naphthalene chromophore was also observed, as shown by the bands E and F in Fig. 1(a), due to our strong excitation regime, whereas it was not observed in the previous report [3]. The observations indicate that the phosphorescence of (C 10 H C H 7 2 4 NH ) PbCl 3 2 4 is induced by the energy transfer from the excitonic state of inorganic quantum well to the triplet state of naphthalene chromophore.…”

“…We observed the excitonic emission from lead chloride quantum well at 3.7 eV in the PL spectrum of (C H 8 17 NH ) 3 2 PbCl 4 at ambient pressure (not shown in Fig. 1(b)).…”

“…2, a change in the absorption spectrum of (C 10 H C H 7 2 4 NH ) 3 2 PbCl 4 with pressure is shown. A steep rise in the optical density originates from the edge of an absorption band due to exciton in the lead chloride layer.…”

“…The exciton energy decreases linearly with pressure up to 5 GPa (the pressure coefficient: -50 meV/GPa) and then increases with further applying pressure. We also obtained the pressure coefficient of the exciton band in (C 8 H 17 NH ) 3 2 PbCl 4 to be -58 meV/GPa. The red-shifts can be explained mainly by the elevation of the valence band maximum with pressure due to its antibonding nature between Pb-6s and Cl-3p orbitals [5].…”

“…Lead halide-based compounds with a naphthalene chromophore have been reported to exhibit enhanced phosphorescence from the naphthalene chromophore [2,3], and have drawn attention due to a potential use as light emitting devices. Both the reports have dealt with phosphorescence caused by energy transfer from the excitonic state in the inorganic quantum well to the triplet state of the naphthalene chromophore.…”