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Bluish-white Light-emitting 2D Sheets of Lead-free Perovskite Cesium Titanium Bromide (CsTiBr3) by a Two-stage Deposition Technique

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Abstract

Bluish-white light-emitting materials are commonly used in LED lighting because they produce natural-looking light. Here we report the photoluminescent emission (PL) of novel, two-dimensional lead-free CsTiBr3 perovskite prepared via a two-stage deposition process. The formation of two-dimensional nanosheets of CsTiBr3 perovskite is confirmed by XRD, EDAX, and FESEM analysis. The height of the cesium bromide thin film substrate from the titanium bromide vapor source plays an important role in the formation of two-dimensional CsTiBr3. The CsTiBr3 perovskite nanosheets exhibit unique exciton- luminescence at 440 nm and self-trapped exciton emission at 595 nm which are the characteristics of two-dimensional halide structure, along with the band-to-band emission at 400 nm at an excitation wavelength of 340 nm. The resulting bluish-white light PL emission makes two-dimensional CsTiBr3 perovskite an alternative material to the traditional lead-based perovskite in LEDs, display technology, solid-state lighting, and various optoelectronic devices, addressing environmental concerns.

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Acknowledgements

The authors acknowledge Sophisticated Test and Instrumentation Center (STIC), Cochin for their support in characterization.

Funding

The author acknowledges KSCSTE (916/2022), and DST-SERB(CRG/2018/003785) for the financial support.

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Authors and Affiliations

  1. Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India

    K A Benazeera Beegum, Saranya Sasi, Christeena Thomas, Alex Mathew & Reshmi Raman

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Contributions

K A B and R R have substantial contribution towards conception and design . K A B, S S and C T have contributed to acquisition and interpretation of data. K A B drafted the data and R R revised it critically for important intellectual content. R R and A M approved the final version of the manuscript.

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Correspondence to Reshmi Raman.

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Beegum, K.A.B., Sasi, S., Thomas, C. et al. Bluish-white Light-emitting 2D Sheets of Lead-free Perovskite Cesium Titanium Bromide (CsTiBr3) by a Two-stage Deposition Technique. J Fluoresc (2023). https://doi.org/10.1007/s10895-023-03444-4

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