PMID- 35910938
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220802
IS  - 2637-6113 (Electronic)
IS  - 2637-6113 (Linking)
VI  - 4
IP  - 7
DP  - 2022 Jul 26
TI  - Delayed Fluorescence by Triplet-Triplet Annihilation from Columnar Liquid Crystal 
      Films.
PG  - 3486-3494
LID - 10.1021/acsaelm.2c00432 [doi]
AB  - Delayed fluorescence (DF) by triplet-triplet annihilation (TTA) is observed in 
      solutions of a benzoperylene-imidoester mesogen that shows a hexagonal columnar 
      mesophase at room temperature in the neat state. A similar benzoperylene-imide 
      with a slightly smaller HOMO-LUMO gap, that also is hexagonal columnar liquid 
      crystalline at room temperature, does not show DF in solution, and mixtures of 
      the two mesogens show no DF in solution either, because of collisional quenching 
      of the excited triplet states on the imidoester by the imide. In contrast, DF by 
      TTA from the imide but not from the imidoester is observed in condensed films of 
      such mixtures, even though neat films of either single material are not 
      displaying DF. In contrast to the DF from the monomeric imidoester in solution, 
      DF of the imide occurs from dimeric aggregates in the blend films, assisted by 
      the imidoester. Thus, the close contact of intimately stacked molecules of the 
      two different species in the columnar mesophase leads to a unique 
      mesophase-assisted aggregate DF. This constitutes the first observation of DF by 
      TTA from the columnar liquid crystalline state. If the imide is dispersed in 
      films of polybromostyrene, which provides an external heavy-atom effect 
      facilitating triplet formation, DF is also observed. Organic light-emitting 
      diodes (OLEDs) devices incorporating these liquid crystal molecules demonstrated 
      high external quantum efficiency (EQE). On the basis of the literature and to the 
      best of our knowledge, the EQE reported is the highest among nondoped 
      solution-processed OLED devices using a columnar liquid crystal molecule as the 
      emitting layer.
CI  - (c) 2022 The Authors. Published by American Chemical Society.
FAU - Franca, Larissa G
AU  - Franca LG
AUID- ORCID: 0000-0002-8089-2525
AD  - Department of Physics, Durham University, South Road, Durham, DH1 3LE, United 
      Kingdom.
AD  - Departamento de Fisica, Universidade Federal de Santa Catarina, 88040900, 
      Florianopolis, Santa Catarina, Brazil.
FAU - Dos Santos, Paloma L
AU  - Dos Santos PL
AD  - Department of Physics, Durham University, South Road, Durham, DH1 3LE, United 
      Kingdom.
FAU - Pander, Piotr
AU  - Pander P
AUID- ORCID: 0000-0003-4103-4154
AD  - Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100 
      Gliwice, Poland.
AD  - Department of Physics, Durham University, South Road, Durham, DH1 3LE, United 
      Kingdom.
FAU - Cabral, Marilia G B
AU  - Cabral MGB
AD  - Departamento de Quimica, Universidade Federal da Paraiba, CEP 58051-900, Joao 
      Pessoa, Paraiba, Brazil.
AD  - Centre de Recherche Paul-Pascal, CNRS & Universite de Bordeaux, 33600, Pessac, 
      France.
FAU - Cristiano, Rodrigo
AU  - Cristiano R
AD  - Departamento de Quimica, Universidade Federal da Paraiba, CEP 58051-900, Joao 
      Pessoa, Paraiba, Brazil.
FAU - Cazati, Thiago
AU  - Cazati T
AD  - Departamento de Fisica, Universidade Federal de Ouro Preto - UFOP, 35400-000, 
      Ouro Preto, Minas Gerais, Brazil.
FAU - Monkman, Andrew P
AU  - Monkman AP
AUID- ORCID: 0000-0002-0784-8640
AD  - Department of Physics, Durham University, South Road, Durham, DH1 3LE, United 
      Kingdom.
FAU - Bock, Harald
AU  - Bock H
AD  - Centre de Recherche Paul-Pascal, CNRS & Universite de Bordeaux, 33600, Pessac, 
      France.
FAU - Eccher, Juliana
AU  - Eccher J
AD  - Departamento de Fisica, Universidade Federal de Santa Catarina, 88040900, 
      Florianopolis, Santa Catarina, Brazil.
LA  - eng
PT  - Journal Article
DEP - 20220627
PL  - United States
TA  - ACS Appl Electron Mater
JT  - ACS applied electronic materials
JID - 101734996
PMC - PMC9330766
COIS- The authors declare no competing financial interest.
EDAT- 2022/08/02 06:00
MHDA- 2022/08/02 06:01
PMCR- 2022/07/28
CRDT- 2022/08/01 03:39
PHST- 2022/08/01 03:39 [entrez]
PHST- 2022/08/02 06:00 [pubmed]
PHST- 2022/08/02 06:01 [medline]
PHST- 2022/07/28 00:00 [pmc-release]
AID - 10.1021/acsaelm.2c00432 [doi]
PST - ppublish
SO  - ACS Appl Electron Mater. 2022 Jul 26;4(7):3486-3494. doi: 
      10.1021/acsaelm.2c00432. Epub 2022 Jun 27.