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Environmental control of triplet emission in donor–bridge–acceptor organometallics

DOI: 10.1002/adfm.201908715 DOI Help

Authors: Jiale Feng (University of Cambridge) , Lupeng Yang (University of Cambridge) , Alexander S. Romanov (University of East Anglia) , Jirawit Ratanapreechachai (University of Cambridge) , Antti‐pekka M. Reponen (University of Cambridge) , Saul T. E. Jones (University of Cambridge) , Mikko Linnolahti (University of Eastern Finland) , Timothy J. H. Hele (University of Cambridge) , Anna Köhler (University of Bayreuth) , Heinz Bässler (University of Bayreuth) , Manfred Bochmann (University of East Anglia) , Dan Credgington (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Functional Materials

State: Published (Approved)
Published: January 2020

Open Access Open Access

Abstract: Carbene‐metal‐amides (CMAs) are a promising family of donor–bridge–acceptor molecular charge‐transfer (CT) emitters for organic light‐emitting diodes. A universal approach is demonstrated to tune the energy of their CT emission. A blueshift of up to 210 meV is achievable in solid state via dilution in a polar host matrix. The origin of this shift has two components: constraint of thermally‐activated triplet diffusion, and electrostatic interactions between guest and polar host. This allows the emission of mid‐green CMA archetypes to be tuned to sky blue without chemical modifications. Monte‐Carlo simulations based on a Marcus‐type transfer integral successfully reproduce the concentration‐ and temperature‐dependent triplet diffusion process, revealing a substantial shift in the ensemble density of states in polar hosts. In gold‐bridged CMAs, this shift does not lead to a significant change in luminescence lifetime, thermal activation energy, reorganization energy, or intersystem crossing rate. These discoveries offer new insight into coupling between the singlet and triplet manifolds in CMA materials, revealing a dominant interaction between states of CT character. The same approach is employed using materials which have been chemically modified to alter the energy of their CT state directly, shifting the emission of sky‐blue chromophores into the practical blue range.

Journal Keywords: carbene‐metal‐amide; coupling mechanism; emission tuning; organometallics; thermally‐activated delayed fluorescence

Subject Areas: Materials, Physics

Instruments: I07-Surface & interface diffraction