Multi-resonance TADF in optical cavities: suppressing excimer emission through efficient energy transfer to the lower polariton states

Cho, Inseong; Kendrick, William J.; Stuart, Alexandra N.; Ramkissoon, Pria; Ghiggino, Kenneth P.; Wong, Wallace W. H.; Lakhwani, Girish

doi:10.1039/d3tc02133e

Cited by 5 publications

(1 citation statement)

References 42 publications

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“…The slight blue shift of the P-emission compared to the absorption has been a feature in many experiments. [51][52][53][54][55] In strongly coupled systems consisting of molecules at room temperature, the emission from the P+ state is rarely observed due to the nonradiative decay to the lower energy levels. [55][56][57][58] Interestingly, the excimer-like emission (Figure S4) showed no dispersive characteristics, indicating a non-polaritonic nature.…”

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confidence: 99%

Electronic Strong Coupling Modifies the Ground-state Intermolecular Interactions in Chlorin Thin Films

Biswas,

Mondal,

Chandrasekharan

et al. 2024

Preprint

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The electronic strong coupling (ESC) of a molecular transition with cavity modes can result in modified excited state photophysics compared to its uncoupled counterparts. Often, such changes are attributed to kinetics effects, overlooking the possible modifications to ground-state intermolecular interactions. The spin-coated films of Chlorin e6 trimethyl ester (Ce6T) provide a platform for studying the role of ESC in dictating photophysics and intermolecular interactions. The preorganization of Ce6T molecules in thin films facilitates intermolecular excitonic interaction, leading to an intense excimer-like emission upon photoexcitation. Interestingly, the ESC of the Ce6T Q-band results in modified luminescence characteristics, where the polaritonic emission dominates over the excimer-like emission. Remarkably, our steady-state, time-resolved emission and the excitation spectral analysis reveal that ESC suppresses the ground-state intermolecular excitonic interactions that otherwise exist in the preorganized Ce6T thin films. These findings will provide valuable insights into the fundamentals of quantum light-matter interactions and coherent energy transport processes.

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confidence: 99%

Electronic Strong Coupling Modifies the Ground-state Intermolecular Interactions in Chlorin Thin Films

Biswas,

Mondal,

Chandrasekharan

et al. 2024

Preprint

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Chiral Co‐Assembly with Narrowband Multi‐Resonance Characteristics for High‐Performance Circularly Polarized Organic Light‐Emitting Diodes

Guo,

Zhang,

Zhao

et al. 2024

Advanced Materials

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A promising kind of ternary chiral co‐assemblies with high PLQY, large dissymmetry factor (glum), and narrowband multi‐resonance characteristics are achieved by codoped‐thermal annealing treatments of achiral luminescent polymer F8BT, chiral inducers R/S‐5011, and achiral FRET acceptor DBN‐ICZ. The optimized co‐assemblies (F8BT)0.9‐(R/S‐5011)0.1‐(DBN‐ICZ)0.005 display narrowband yellow emission with full‐width half maximum (FWHM) of 37 nm, PLQY of 79%, and intense CPL signals with |glum| of up to 0.26. Meaningfully, solution‐processed CP‐OLEDs by using those ternary chiral co‐assemblies as emitting layer are successfully fabricated, which display yellow circularly polarized electroluminescence (CPEL) with EQEmax of 4.6% and gEL of up to 0.16. The corresponding Q‐factor could reach up to 7.36 × 10−3, which is the highest of all the reported CP‐OLEDs. Moreover, the devices also exhibit excellent comprehensive device performance with low Von of 7.0 V, high Lmax of about 25 000 cd m−2, extremely low efficiency roll‐off with EQE of 4.3% at 10 000 cd m−2, as well as narrowband EL with FWHM of only 39 nm. The proposed ternary co‐assembly strategy in fabricating CP‐OLED provides the possibility to achieve high comprehensive device performance such as balancing high EQE and large gEL value, as well as narrowband emission, high brightness and low efficiency roll‐off simultaneously.

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Recent progress in high-performance thermally activated delayed fluorescence exciplexes based on multiple reverse intersystem crossing channels

Du,

Hao,

Zhang

et al. 2025

Organic Electronics

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Multi-resonance TADF in optical cavities: suppressing excimer emission through efficient energy transfer to the lower polariton states

Abstract: Strong light-matter coupling is exploited as a way to reduce aggregation-induced excimer losses in multi-resonance thermally activated delayed fluorescence emitters.

Cited by 5 publications

References 42 publications

Electronic Strong Coupling Modifies the Ground-state Intermolecular Interactions in Chlorin Thin Films

Electronic Strong Coupling Modifies the Ground-state Intermolecular Interactions in Chlorin Thin Films

Chiral Co‐Assembly with Narrowband Multi‐Resonance Characteristics for High‐Performance Circularly Polarized Organic Light‐Emitting Diodes

Recent progress in high-performance thermally activated delayed fluorescence exciplexes based on multiple reverse intersystem crossing channels

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