Abstract
The temperature-dependent photoluminescence (PL) properties of an anti-perovskite [MnBr4]BrCs3 sample in the temperature range of 78–500 K are studied in the present work. This material exhibits unique performance which is different from a typical perovskite. Experiments showed that from room temperature to 78 K, the luminous intensity increased as the temperature decreased. From room temperature to 500 K, the photoluminescence intensity gradually decreased with increasing temperature. Experiments with varying temperatures repeatedly showed that the emission wavelength was very stable. Based on the above-mentioned phenomenon of the changing photoluminescence under different temperatures, the mechanism is deduced from the temperature-dependent characteristics of excitons, and the experimental results are explained on the basis of the types of excitons with different energy levels and different recombination rates involved in the steady-state PL process. The results show that in the measured temperature range of 78–500 K, the steady-state PL of [MnBr4]BrCs3 had three excitons with different energy levels and recombination rates participating. The involved excitons with the highest energy level not only had a high radiative recombination rate, but a high non-radiative recombination rate as well. The excitons at the second-highest energy level had a similar radiative recombination rate to the lowest energy level excitons and a had high non-radiative recombination rate. These excitons made the photoluminescence gradually decrease with increasing temperature. This may be the reason for this material’s high photoluminescence efficiency and low electroluminescence efficiency.
Highlights
The temperature-dependent photoluminescence (PL) properties of an anti-perovskite [MnBr4 ]BrCs3 sample in the temperature range of 78–500 K are studied in the present work
From room temperature to 78 K, due to the exciton–photon coupling in [MnBr4 ]BrCs3, excitons that changed by temperature participated in the light emission, resulting in different spectra, narrowing the emission full width at half maximum, reducing the thermal vibration at low temperatures, and gradually increasing the emission intensity
The experimental results are explained according to the Boltzmann distribution theory [26], in which the solid line in Figure 2e shows the fitting results, and the results show the models of excitons with three different energies participating in the luminescence process, which are used to fit the experimental results of photoluminescence spectral intensity and peak position varying with temperature
Summary
The temperature-dependent photoluminescence (PL) properties of an anti-perovskite [MnBr4 ]BrCs3 sample in the temperature range of 78–500 K are studied in the present work. This material exhibits unique performance which is different from a typical perovskite. The excitons at the secondhighest energy level had a similar radiative recombination rate to the lowest energy level excitons and a had high non-radiative recombination rate. These excitons made the photoluminescence gradually decrease with increasing temperature. Nanomaterials 2021, 11, 3310 cations shows better thermal and chemical stability [12,13]; lead’s inherent toxicity and the instability of lead-based perovskites severely limit their practical applications
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