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Universal Polymeric Hole Transporting Material for Solution-Processable Green and Blue Thermally Activated Delayed
Hyeondoo Je1, Min Ju Cho1, Na Yeon Kwon1
1Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
ACS Applied Materials & Interfaces
|February 13, 2023
Summary
A novel vinyl polymer, PmCP, was synthesized for high-efficiency solution-processed organic light-emitting diodes (OLEDs). This material demonstrates superior hole transport properties, enabling efficient green and blue light emission in OLED devices.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- High-efficiency solution-processed organic light-emitting diodes (OLEDs) require advanced hole transport materials (HTMs).
- Existing HTMs like poly(N-vinylcarbazole) (PVK) have limitations in performance for certain OLED applications.
Purpose of the Study:
- To synthesize and characterize a new vinyl polymer, PmCP, for use as a solution-processable HTM.
- To evaluate the performance of PmCP in thermally activated delayed fluorescence (TADF) OLEDs for green and blue emissions.
- To compare the efficacy of PmCP against the reference HTM, PVK.
Main Methods:
- Radical polymerization was employed to synthesize the PmCP vinyl polymer.
- PmCP was characterized for film-forming ability, thermal stability, triplet energy, and hole mobility.
- Solution-processable TADF-OLEDs utilizing PmCP as the hole transport layer (HTL) were fabricated using orthogonal solvents.
Main Results:
- PmCP exhibited good film-forming properties and thermal stability.
- PmCP demonstrated higher triplet energy and hole mobility compared to PVK.
- Fabricated OLEDs achieved high external quantum efficiencies (EQEs) of 29.60% (green) and 11.00% (blue).
- PmCP-based OLEDs outperformed PVK-based devices.
Conclusions:
- PmCP is a promising solution-processable HTM for high-efficiency TADF OLEDs.
- PmCP can effectively replace PVK and is suitable for both green and blue emitting devices.
- The developed material facilitates the fabrication of high-performance, solution-processed OLEDs.
