Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores - Archive ouverte HAL Access content directly
Journal Articles Chemistry - A European Journal Year : 2020

Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores

Ritesh Haldar
  • Function : Author
Marius Jakoby
  • Function : Author
Mariana Kozlowska
  • Function : Author
Motiur Rahman Rahman
  • Function : Author
Hongye Chen
  • Function : Author
Yohanes Pramudya
  • Function : Author
Bryce S. Richards
  • Function : Author
Lars Heinke
  • Function : Author
Wolfgang Wenzel
  • Function : Author
Ian A. Howard
  • Function : Author
Uli Lemmer
  • Function : Author
Christof Wöll

Abstract

Several photophysical properties of chromo-phores depend crucially on intermolecular interactions. Thermally-activated delayed fluorescence (TADF) is often influenced by close packing of the chromophore assembly. In this context, the metal-organic framework (MOF) approach has several advantages: it can be used to steer aggregation such that the orientation within aggregated structures can be predicted using rational approaches. We demonstrate this design concept for a DPA-TPE (diphenyl-amine-tetraphenylethylene) chromophore, which is non-emissive in its solvated state due to vibrational quenching. Turning this DPA-TPE into a ditopic linker makes it possible to grow oriented MOF thin films exhibiting pronounced green electroluminescence with low onset voltages. Measurements at different temperatures clearly demonstrate the presence of TADF. Finally, this work reports that the layer-by-layer process used for MOF thin film deposition allows the integration of the TADF-DPA-TPE in a functioning LED device.
Fichier principal
Vignette du fichier
chem.202003712.pdf (1.06 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-03013715 , version 1 (19-11-2020)

Identifiers

Cite

Ritesh Haldar, Marius Jakoby, Mariana Kozlowska, Motiur Rahman Rahman, Hongye Chen, et al.. Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores. Chemistry - A European Journal, 2020, 2020, pp.1 - 6. ⟨10.1002/chem.202003712⟩. ⟨hal-03013715⟩
18 View
68 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More