Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 15, Pages 4245-4250Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b01729
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Funding
- KWA
- Swedish Research Council
- STEM
- Crafoord Foundation
- Laserlab-Europe EU H2020 [654148]
- Department of Science and Technology (DST), India under Indo-Swedish (DST-VR) joint scheme [DST/INT/SWD/VR/P-06/2014]
- SERB grant, DST, India [EMR/2014/000664]
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Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique optoelectronic and photoluminescence (PL) properties. Here, we examine the phase composition and the temperature dependence of emission line width broadening in formamidinium lead bromide (FAPbBr(3)) perovskite nanocrystals (NCs) for light-emitting applications and identify different charge-carrier scattering mechanisms. Our results show most of the emission is from the orthorhombic phase. The PL line width broadening at high temperature is dominated by the Frohlich interaction betwee n the free charge carriers and the optical phonons. At low temperatures, the peak of the PL spectrum exhibits a continuous red shift indicating an increase of excitons contribution at lower temperatures, and concurrently the line width also narrows down due to the inhibition of the optical phonons. From the temperature-dependent measurements, the coupling strength of both the charge phonon interaction and the exciton phonon interaction have been determined. The obtained results indicate that the charge phonon coupling strengths are higher compared to the exciton phonon coupling.
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