Temperature dependent scintillation properties and mechanisms of (PEA)₂PbBr₄ single crystals

Temperature dependent scintillation properties and mechanisms of (PEA)₂PbBr₄ single crystals

van Blaaderen, J.J. (TU Delft RST/Luminescence Materials)
Maddalena, Francesco (Nanyang Technological University)
Dang, Cuong (Nanyang Technological University)
Birowosuto, Muhammad Danang (PORT Polish Center for Technology Development, Wroclaw)
Dorenbos, P. (TU Delft RST/Luminescence Materials)

2022

In this work the scintillation properties of PEA₂PbBr₄ are studied as function of temperature, accessing the potential use of these materials for low temperature applications. The scintillation properties and mechanism have been studied using a combination of temperature dependent photoluminescence emission and excitation, X-ray excited emission and decay measurements. At room temperature the X-ray excited emission is dominated by the 442 nm emission with a lifetime of 35.2 ns. Under UV-Vis photon excitation an additional emission peak is observed at 412 nm. At 10 K, both X-ray and UV-Vis photon excited emission spectra show a narrow emission peak at 412 nm and a broad emission band centred around 525 nm with a lifetime of 1.53 ns (24%) and 154 ns (76%) respectively. The exact nature of the observed emission peaks is not known. For this reason two potential mechanisms explaining the difference between UV-Vis photon and X-ray excitation and their temperature dependent emissions are explored. The total spectral intensity decreases to 72% of the intensity at room temperature at 10 K. It is suggested that the observed negative thermal quenching behaviour results from a combination of more self absorption and a higher degree of self trapped exciton formation under X-ray excitation. Based on the observed fast decay component at 10 K and light yield of 9400 photons per MeV at room temperature, showing only a 28% decrease at 10 K, could make this material potentially interesting for low temperature and fast timing applications.

http://resolver.tudelft.nl/uuid:73a45260-d7d9-410c-935f-8b59bb02a428

https://doi.org/10.1039/d2tc01483a

2050-7526

Journal of Materials Chemistry C: materials for optical and electronic devices, 10 (32), 11598-11606

Institutional Repository

journal article

© 2022 J.J. van Blaaderen, Francesco Maddalena, Cuong Dang, Muhammad Danang Birowosuto, P. Dorenbos