Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.098
Publication date: 11th December 2017
In our previous work1, we found that a lead iodide-based layered perovskite with cyclohexenylethy ammonium molecular cation as an organic layer exhibits highly efficient PL originated from an exciton having large binding energy of several hundred meV. Further, highly efficient EL was observed in a device consisting of emissive layer of a spin-coated film of the layered perovskite and an electron-transporting layer of an oxadiazole. Here, we would like to present detailed optical and electroluminescent (EL) properties in the layered perovskite.
Kramers-Kronig transformation of reflection spectrum measured using a crystal sample of the layered perovskite demonstrated that an exciton band locates at 2.452 eV at RT. Polarization dependencies of its PL at 4 K revealed that emission bands assigned to singlet-dominant exciton and triplet-dominant exciton are located at 2.408 eV and 2.398eV, respectively. The PL excitation spectrum measured by detecting emission of the triplet-dominant exciton demonstrated the formation of an exciton-polariton in the crystal sample; L-T splitting = 94 meV, transverse exciton energy ET = 2.410 eV, and longitudinal exciton energy EL =2.504 eV. From the values, oscillator strength of the exciton band was estimated to be 0.74, and band gap Eg and binding energy Eb of the exciton were estimated to be 2.68 eV and 282 meV, respectively. The PL quantum efficiency was evaluated to be about 0.7 at 110 K from the quantum efficiency measurement using integrated optical sphere.
Efficient EL was observed in the hetero-structure devices consisting of the layered perovskite emissive layer and organic electron-transporting layer. We will present the detailed EL properties in the devices.
M. Era el al., Appl. Phys. Lett., 65, 676 (1994).
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