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Journal article
Efficient greenish-blue thermally activated delayed fluorescence Zn complex for organic light emitting devices
Organic electronics, Vol.138, 107178
03/01/2025
Web of Science ID: WOS:001396607000001
Abstract
A greenish-blue zinc complex Zn(PhOBz)-PXZ with enhanced thermally activated delayed fluorescence (TADF) properties has been prepared from Zn(OAc)2 and 4PXZ2OHBz, a 2-(1H-benzimidazol-2-yl)phenol-based TADF ligand. The TADF phenomenon has been confirmed by time-resolved photoluminescence (TrPL) studies. The DFT calculations show spatially well-separated HOMO and LUMO in their ground states, along with a small energy splitting between the excited singlet (S1) and triplet (T1) states, in a good agreement with the TADF mechanism. Due to the high thermal stability of Zn(PhOBz)-PXZ, OLED devices can be fabricated by vacuum vapor deposition, and greenish-blue OLEDs with the maximum emission at 521 nm were successfully demonstrated. The maximum external quantum efficiency (EQEmax) of 10.6 %, with Commission Internationale de l’Eclairage (CIE) coordinates of (0.28, 0.47) were recorded. Zinc TADF complexes have the advantages of cost-effectiveness, greater abundance of natural resources, environmentally friendly metals, making them potential replacements for future precious metal emitters.
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Details
- Title
- Efficient greenish-blue thermally activated delayed fluorescence Zn complex for organic light emitting devices
- Publication Details
- Organic electronics, Vol.138, 107178
- Resource Type
- Journal article
- Publisher
- Elsevier B.V
- Number of pages
- 8
- Grant note
- National Science and Technology Council (NSTC) , Taiwan: NSTC 112-2639-M-002-007-ASP, 111-2634-F-002-016, 111-2113-M-002-023, 112-2113-M-002-001, 113-2112-M-019-002, 113-2113-M-002-012, 113-2622-E-155-002, 113-2123-M-002-012- Ministry of Education (MOE): 111L9006 United Microelectronics Corporation (UMC) Fellowship
This work was supported by the National Science and Technology Council (NSTC), Taiwan, under grants NSTC 112-2639-M-002-007-ASP; 111-2634-F-002-016 and 111-2113-M-002-023, 112-2113-M-002-001, 113-2112-M-019-002, 113-2113-M-002-012, 113-2622-E-155-002, 113-2123-M-002-012-, Ministry of Education (MOE) 111L9006; and the High-Performance Computing (HPC) environment at the University of Richmond for providing computational resources. This research was also supported by United Microelectronics Corporation (UMC) Fellowship. We are grateful to Prof. Yi-Ting Lee for assisting us with the AC-2 measurements at Academia Sinica. Mass spectrometry analyses were performed by Mass spectrometry facility of the institute of chemistry, Academia Sinica, Taiwan.
- Copyright
- © 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
- Identifiers
- WOS:001396607000001; 99381548016806600
- Academic Unit
- Chemistry; Hal Marcus College of Science and Engineering
- Language
- English