Narrow and broadband light emission in layered organic lead halide perovskites: interplay between weak electron-lattice interactions and defect-related effects

Claudio Quarti

doi:10.1117/12.2568681

15 September 2020 Narrow and broadband light emission in layered organic lead halide perovskites: interplay between weak electron-lattice interactions and defect-related effects

Claudio Quarti

Author Affiliations +

Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 114640Y (2020) https://doi.org/10.1117/12.2568681
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

2-Dimensional metal Halide Perovskites (2D-HP) are at the limelight for their potential exploitation in light-emission related applications. In particular, the most-investigated <001<-terminated 2D HP family shows dominant narrow light emission, with reduced Stokes shift, of great interest for display applications. In parallel, these systems often show additional largely Stokes-shifted emission, with reduced spectral resolution, of interest for the lighting application, e.g. development of white light-emitting diodes. Clarifying the emission mechanisms in 2D-HP and explaining the coexistence of these two contrasting emission regimes is greatly coveted, for the further exploitation of this class of semiconductors. Here, Density Functional Theory (DFT) simulations estimate total electron-phonon interaction in 2DHP in the order of few tens of meV, in agreement with ps-resolved UV-vis measurements, consistent with the reported narrow emission. On the other hand, such small coupling significantly contrasts with the assignment of broadband emission to some form of intrinsic (defect-free) self-trapped exciton. Additional DFT simulations rather assign broadband emission to extrinsic self-trapping, associated to point defects, halide interstitials in particular. This result is in line with similar findings for the parental 3D halide perovskite and highlights, on the one hand, the role of halide defects in lead-halide perovskitoids frames, and explains, on the other hand, the apparent contrasting nature of narrow and broadband emission, as due to two different emission mechanisms. Defect engineering protocol are therefore suggested, to optimize broadband emission in 2D-HP materials.

Conference Presentation

Citation Download Citation

Claudio Quarti "Narrow and broadband light emission in layered organic lead halide perovskites: interplay between weak electron-lattice interactions and defect-related effects", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 114640Y (15 September 2020); https://doi.org/10.1117/12.2568681

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available