研究目的
Investigating the design and performance of electron transport type host materials for blue thermally activated delayed fluorescent organic light-emitting diodes (TADF OLEDs).
研究成果
The electron transport type host materials designed for the blue TADF devices showed high triplet energy over 3.0 eV and improved the device performances of the TADF OLEDs by optimizing the host composition of the mixed host. The device performances such as current density, EQE and device lifetime were improved at the electron transport type host rich composition. The three hosts showed high EQE over 20% and the device lifetime over 30 h up to 75% of initial luminance at 500 cd/m2.
研究不足
The study focused on the design and performance of electron transport type host materials for blue TADF OLEDs. The limitations include the specific focus on blue TADF emitters and the need for further optimization of the host materials for improved device lifetime and efficiency.
1：Experimental Design and Method Selection:
The study involved the synthesis and characterization of three electron transport type host materials with different substitution positions of the dibenzofuran moiety. The materials were designed to have high triplet energy and electron transport properties.
2：Sample Selection and Data Sources:
The materials were synthesized and their photophysical properties were measured using UV-vis and PL spectroscopy.
3：List of Experimental Equipment and Materials:
The synthesis involved Suzuki coupling reaction and nucleophilic substitution reaction. Photophysical properties were measured using UV-vis and PL spectroscopy. Thermal properties were studied by DSC and TGA measurements.
4：Experimental Procedures and Operational Workflow:
The materials were synthesized, characterized, and then applied in blue TADF OLEDs to evaluate their performance.
5：Data Analysis Methods:
The performance of the OLEDs was evaluated based on current density, luminance, EQE, and device lifetime.
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