Projects per year
Abstract
Chromophores face applicability limitations due to their natural tendency to aggregate, with a subsequent deactivation of their emission features. Hence, there has been a fast development of aggregation induced emission (AIE) emitters, in which non-radiative motional deactivation is inhibited. However, a fine control of their colloidal properties governing the emitting performance is fundamental for their application in thin film optoelectronics. In addition, ion-based lighting devices, such as light emitting electrochemical cells (LECs), requires the design of ionic AIE emitters, whose structure allows (i) an easy ion polarizability to assist charge injection and (ii) a reversible electrochemical behavior. To date, these fundamental questions have not been addressed. Herein, the hydrophilic/hydrophobic balance of a family of cationic tetraphenyl ethene (TPE) derivatives is finely tuned by chemical design. The hydrophilic yet repulsive effect of pyridinium-based cationic moieties is balanced with hydrophobic variables (long alkyl chains or counterion chemistry), leading to (i) a control between monomeric/aggregate state ruling photoluminescence, (ii) redox behavior, and (iii) enhanced ion conductivity in thin films. This resulted in a LEC enhancement with the first ionic AIE emitters, reaching values of 0.19 lm W−1 at ca. 50 cd m−2. Overall, this design rule will be key to advance ionic active species for optoelectronics.
Original language | English |
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Pages (from-to) | 2755-2762 |
Number of pages | 8 |
Journal | Chemical Science |
Volume | 15 |
Issue number | 8 |
Early online date | 25 Jan 2024 |
DOIs | |
Publication status | Published - 28 Feb 2024 |
MoE publication type | A1 Journal article-refereed |
Fingerprint
Dive into the research topics of 'Controlling aggregation-induced emission by supramolecular interactions and colloidal stability in ionic emitters for light-emitting electrochemical cells'. Together they form a unique fingerprint.Projects
- 3 Active
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LIBER Kostiainen: Life-like hybrid materials Kostiainen
Kostiainen, M. (Principal investigator), Luotonen, O. (Project Member), George, L. (Project Member), Wierzchowiecka, J. (Project Member) & Zhou, Y. (Project Member)
01/01/2022 → 31/12/2024
Project: Academy of Finland: Other research funding
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PhotoCage Tutkimuskulut I: Photoactive protein cage biohybrids for light-induced applications
Anaya Plaza, E. (Principal investigator), Sanz Velasco, A. (Project Member) & Rodriguez-Perez, O. (Project Member)
01/09/2021 → 14/09/2025
Project: Academy of Finland: Other research funding
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PhotoCage: Photoactive protein cage biohybrids for light-induced applications
Anaya Plaza, E. (Principal investigator)
01/09/2021 → 16/05/2027
Project: Academy of Finland: Other research funding
Equipment
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Bioeconomy Research Infrastructure
Seppälä, J. (Manager)
School of Chemical EngineeringFacility/equipment: Facility
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Raw Materials Research Infrastructure
Karppinen, M. (Manager)
School of Chemical EngineeringFacility/equipment: Facility
Press/Media
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Data from Aalto University Advance Knowledge in Supramolecular Research (Controlling Aggregation-induced Emission By Supramolecular Interactions and Colloidal Stability In Ionic Emitters for Light-emitting Electrochemical Cells)
Kostiainen, M. & Anaya-Plaza, E.
05/03/2024
1 item of Media coverage
Press/Media: Media appearance