PMID- 37339450
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20230705
LR  - 20230705
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 15
IP  - 26
DP  - 2023 Jul 5
TI  - Creation of Dual Thermally Activated Delayed-Fluorescence Exciplexes in a Bulk 
      Emitting Layer and Its Interface with an Electron Transport Layer for Promoting 
      the Performance of Thermally Activated Delayed-Fluorescence Organic 
      Light-Emitting Diodes Fabricated by a Solution Process.
PG  - 31692-31702
LID - 10.1021/acsami.3c06128 [doi]
AB  - An exciplex, which is composed of electron donor and acceptor molecules and 
      formed by intermolecular charge transfer, is an excited-state species that is 
      able to emit light or transfer its energy to a lower-energy emitter. In reported 
      exciplex-based organic light-emitting diodes (OLEDs), their working mechanism is 
      to generate exciplexes either in the bulk emitting layer (bulk exciplex) or at 
      its interface with an electron transport layer (interface exciplex); both types 
      give promising device performance. Here, we propose a novel strategy of creating 
      both types of exciplexes simultaneously (dual exciplexes) for the generation of 
      more exciplexes for better device performance as indicated in the improved 
      photoluminescence quantum yield (PLQY). Impressively, the dual exciplex-based 
      device with blue thermally activated delayed fluorescence (TADF) emitter 
      9,9-dimethyl-9,10-dihydroacridine-2,4,6-triphenyl-1,3,5-triazine (DMAC-TRZ) 
      exhibits a record-high maximum external quantum efficiency (EQE(max)) of 26.7% 
      among the solution-processed TADF blue OLEDs. By further doping with the 
      red-emitting phosphor emitter into the EML, the white device also gives a 
      record-high EQE(max) of 24.1% among the solution-processed TADF-phosphor hybrid 
      white OLEDs (T-P WOLEDs) with the Commission Internationale de L'Eclairage (CIE) 
      coordinates of (0.34, 0.42), color rendering index of 70, and correlated color 
      temperature of 5198 K. Furthermore, both blue and white devices show an ultralow 
      efficiency roll-off with external quantum efficiencies at a practical brightness 
      value of 1000 cd m(-2) (EQE(1000)) of 25.1 and 23.9%, respectively. This is the 
      first report of employing a dual exciplex-based OLED with excellent device 
      performance.
FAU - Cheng, Wei-Chih
AU  - Cheng WC
AD  - Department of Chemical Engineering, National Tsing-Hua University, Hsinchu 30013, 
      Taiwan.
FAU - Tsai, Meng Rong
AU  - Tsai MR
AD  - Department of Chemical Engineering, National Tsing-Hua University, Hsinchu 30013, 
      Taiwan.
FAU - Chen, Show-An
AU  - Chen SA
AUID- ORCID: 0000-0003-1133-8974
AD  - Department of Chemical Engineering, National Tsing-Hua University, Hsinchu 30013, 
      Taiwan.
LA  - eng
PT  - Journal Article
DEP - 20230620
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
SB  - IM
OTO - NOTNLM
OT  - bulk emitting layer
OT  - electron transport layer
OT  - exciplex
OT  - light-emitting diodes
OT  - thermally activated delayed fluorescence
EDAT- 2023/06/20 19:14
MHDA- 2023/06/20 19:15
CRDT- 2023/06/20 16:43
PHST- 2023/06/20 19:15 [medline]
PHST- 2023/06/20 19:14 [pubmed]
PHST- 2023/06/20 16:43 [entrez]
AID - 10.1021/acsami.3c06128 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2023 Jul 5;15(26):31692-31702. doi: 
      10.1021/acsami.3c06128. Epub 2023 Jun 20.