Molecular and Self-Trapped Excitonic Contributions to the Broadband Luminescence in Diamine-Based Low-Dimensional Hybrid Perovskite Systems

Shrreya Krishnamurthy, Rounak Naphade, Wasim J. Mir, Suresh Gosavi, Sudip Chakraborty*, Ramanathan Vaidhyanathan, Satishchandra Ogale

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    44 Scopus citations

    Abstract

    The present solid state lighting (SSL) technology is based on using a combination of phosphors to give the desired white light emitting devices. The property of broadband emission from a single phosphor is not only difficult to achieve but also poses a challenge in device fabrication. Hybrid organic–inorganic perovskites especially in low dimensions (2D/1D) are being widely explored for their optoelectronic properties. Few of these materials exhibit broadband emission upon ultraviolet excitation, providing a scope for synthetic engineering in achieving commercially viable single-phosphor materials. In this work, three interesting diammonium-based low-dimensional hybrid perovskites for broadband photoluminescence (PL) are examined. The doubly protonated ethylenediamine-configured monoclinic (P21/n) 1D ribbon assembly (H3NCH2CH2NH3)8(Pb4Br18) · Br6 (1) and the orthorhombic (Pbcm) 2D-twisted octahedral (H3NCH2CH2NH3)(Pb2Cl6) (2) show white luminescence, while the doubly protonated piperazine-configured orthorhombic (Pnnm) 0D dual-octahedral (C4N2H12)4(Pb2Br11) · (Br)(H2O)4 (3) exhibits bluish-white luminescence. Based on the PL of the organic diammonium salt, the time-resolved PL, Raman signatures, and density functional theory (DFT) calculations, it is shown that the broadband luminescence has dual origin: one around 400 nm from diammonium-related molecular fluorescence and another around 516 nm from self-trapped excitons. The structure-specific relative contributions and interplay between the two define the overall character of the broadband luminescence.

    Original languageEnglish (US)
    Article number1800751
    JournalAdvanced Optical Materials
    Volume6
    Issue number20
    DOIs
    StatePublished - Oct 18 2018

    Keywords

    • hybrid perovskites
    • self-trapped excitons
    • single crystals
    • small molecules
    • white light emission

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics

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