研究目的
Designing blue thermally activated delayed fluorescent (TADF) emitters with efficient exciton gathering property for high-performance fully-solution-processed hybrid white OLEDs.
研究成果
The research demonstrates that molecular modulation of TADF emitter is a promising strategy to enable its fabrication of fully-solution-processed device. The introduction of bulky phenylcarbazole units can efficiently block the unwanted electromer or electroplex between the bulky unit and the TADF core, ensuring high PLQY and effective energy gathering. This leads to high-performance fully-solution-processed blue and T-P hybrid white OLEDs.
研究不足
The study focuses on the design and synthesis of two specific TADF materials and their application in OLEDs. The performance of these materials in other types of devices or under different conditions was not explored.
1：Experimental Design and Method Selection:
Two TADF materials, PCz-4CzCN and TPA-4CzCN, were designed and synthesized by equipping the emissive core with nonconjugated bulky units.
2：Sample Selection and Data Sources:
The materials were characterized by 1H-NMR, 13C-NMR, mass spectrometry, and elemental analysis.
3：List of Experimental Equipment and Materials:
Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), atomic force microscopy (AFM), cyclic voltammetry, and photoluminescent (PL) spectra were used.
4：Experimental Procedures and Operational Workflow:
The materials were tested in fully-solution-processed OLEDs with the structure: ITO/PEDOT:PSS (20 nm)/Blue TADF (60nm)/PHPO (40 nm)/Cs2CO3 (2 nm)/Al (100 nm).
5：Data Analysis Methods:
The performance of the OLEDs was evaluated based on current density-voltage-luminance and external quantum efficiency–current density curves.
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