Publication

Anti-Kasha electroluminescence in carbene-gold-arylacetylide complexes

2026

Abstract

Kasha's rule states that luminescence occurs from the lowest excited state; violating this rule could enable radiative release of excess electronic energy, otherwise lost as heat in electroluminescent devices. Here we demonstrate anti-Kasha narrowband electroluminescence from carbene-gold(I)-arylacetylide complexes. A rigid acetylide bridge links a (carbene)gold(I) moiety to a multiple-resonance chromophore, thereby spatially separating frontier orbitals to produce a dark long-range charge-transfer S1 and bright shortrange charge-transfer S2 states. Optical spectroscopy and theory show that S2 is populated by reverse intersystem crossing from T1 and T2 triplets, enabled by gold-mediated spin-orbit coupling. Proof-ofconcept solutionprocessed OLEDs exhibit narrowband (26 nm) anti-Kasha electroluminescence with 20.4% maximum external quantum efficiency (EQE), and 13% EQE at 10,000 cd m-2. Posted on 15 February 2026-CC-BY 4.0-This is a preprint and has not been peer reviewed. Data may be preliminary.

Official source

https://infoscience.epfl.ch/entities/publication/e554ce9c-10c6-433f-ab6e-2e90e1f17c99

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e554ce9c-10c6-433f-ab6e-2e90e1f17c99

About this result

Related concepts (32)

Spectroscopy

Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter waves and acoustic waves can also be considered forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory (LIGO).

Electroluminescence

Electroluminescence (EL) is an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field. This is distinct from black body light emission resulting from heat (incandescence), chemical reactions (chemiluminescence), reactions in a liquid (electrochemiluminescence), sound (sonoluminescence), or other mechanical action (mechanoluminescence). Electroluminescence is the result of radiative recombination of electrons & holes in a material, usually a semiconductor.

Raman spectroscopy

Raman spectroscopy (ˈrɑːmən) (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering.

Related publications (19)

Anti-Kasha electroluminescence in carbene-gold-arylacetylide complexes

Chat with Graph Search

Plasmonic sensor device, sensor system and sensing method

The physics of GaN-based light-emitting diodes

Molecular-level understandings and device strategies for FAPbI3-based perovskite solar cells