In:
Journal of Physics: Conference Series, IOP Publishing, Vol. 2174, No. 1 ( 2022-01-01), p. 012030-
Kurzfassung:
Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence-sensitized conventional fluorescence dyes (TSCF) offer the possibility of realizing an ultimate high efficiency and long-term stability devices through solution process. However, the currently reported TSCF-OLEDs easily suffer the harmful Dexter energy transfer (DET) process and aggregation induced quenching (ACQ) effect. Herein, we proposed a new strategy to suppress the DET and ACQ effect by introducing a polymer material into TSCF system, achieving high efficiency and stability of TSCF-OLEDs. The introducing polymer material into TSCF system can not only increase the intermolecular distance between TADF matrix and traditional dyes, further restraining the harmful DET process and ACQ effect, but also improve the solubility and film quality of all TSCF system. Based on this fact, the 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)dibenzo[b, d]thiophene 5,5-dioxide (2Cz-DMAC-BTB) sensitizing 2,8-Di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb) solution-processed device Y2 with poly ethlene oxide (PEO) was firstly fabricated and exhibits a higher maximum EQE of 6.6 % and longer half time (LT 50 ) of 64 hours comparing to that of Y1 without PEO. Subsequently, the TSCF-solution-processed device R2 with PEO shows a maximum EQE max of 13.1 % and LT 50 of 107 hours. These results adequately demonstrate the validity of our proposed strategy and provide a new route for developing more efficient all-fluorescent solution-processed TSCF-OLEDs.
Materialart:
Online-Ressource
ISSN:
1742-6588
,
1742-6596
DOI:
10.1088/1742-6596/2174/1/012030
Sprache:
Unbekannt
Verlag:
IOP Publishing
Publikationsdatum:
2022
ZDB Id:
2166409-2
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