Distinctive Spectroscopic Characteristics Observed in Colloidal Perovskite CsPbBr3 Quantum Dot

초록

Distinctive spectroscopic characteristics are observed in colloidal perovskite CsPbBr3 quantum dot (QD) dispersed in octane doped with PPO. As the content of CsPbBr3-QD increases, the emission and the absorption energies decrease due to QD-cluster formed in case of the inter-QD distance smaller than diameter of QD. Spectroscopic evidences supporting QD-cluster are found in the Urbach energy and the carrier lifetime. Unusual absorption lines showing explicit QD dependence are observed in Fourier-transform infrared spectra, which is explained by vibrational modes of bound PPO hybridized with CsPbBr3-QD.

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