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Molecular and Self-Trapped Excitonic Contributions to the Broadband Luminescence in Diamine-Based Low-Dimensional Hybrid Perovskite Systems
Indian Inst Sci Educ & Res, Ctr Energy Sci, Dept Phys, Doctor Homi Bhabha Rd, Pune 411008, Maharashtra, India;Savitribai Phule Pune Univ, Dept Phys, Pune 411007, Maharashtra, India.
Indian Inst Sci Educ & Res, Ctr Energy Sci, Dept Phys, Doctor Homi Bhabha Rd, Pune 411008, Maharashtra, India.
Indian Inst Sci Educ & Res, Ctr Energy Sci, Dept Chem, Doctor Homi Bhabha Rd, Pune 411008, Maharashtra, India.
Savitribai Phule Pune Univ, Dept Phys, Pune 411007, Maharashtra, India.
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2018 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 6, no 20, article id 1800751Article in journal (Refereed) Published
Abstract [en]

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 (P2(1)/n) 1D ribbon assembly (H3NCH2CH2NH3)(8)(Pb4Br18)Br-6 (1) and the orthorhombic (Pbcm) 2D-twisted octahedral (H3NCH2CH2NH3)(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.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 6, no 20, article id 1800751
Keywords [en]
hybrid perovskites, self-trapped excitons, single crystals, small molecules, white light emission
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-369910DOI: 10.1002/adom.201800751ISI: 000447743000024OAI: oai:DiVA.org:uu-369910DiVA, id: diva2:1272049
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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Chakraborty, Sudip

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