研究目的
To develop pyrimidine-5-carbonitrile as an electrostatic potential managing and strong acceptor moiety for TADF emitters to achieve high efficiency and long lifetime in OLED devices.
研究成果
The development of pyrimidine-5-carbonitrile as a strong and stable acceptor for TADF emitters led to high EQE and long operational lifetime in OLED devices. The 4PyCNBCz emitter demonstrated a high EQE of 19.8% and a doubled lifetime compared to the state-of-the-art TADF emitter, proving the potential of TADF devices as next-generation OLEDs.
研究不足
The color purity of the TADF OLEDs was rather poor due to the broad EL spectra of the devices. The effect of the RISC rate on device lifetime was not observed in emitters with the indolocarbazole donor, possibly due to the instability of the emitters.
1：Experimental Design and Method Selection:
Two types of TADF emitters with donor moieties extended from either the 2 or 4 position of the pyrimidine-5-carbonitrile acceptor were prepared. The effect of donor substitution position on TADF characteristics was studied.
2：Sample Selection and Data Sources:
Four TADF emitters were synthesized and characterized.
3：List of Experimental Equipment and Materials:
High-performance liquid chromatography, nuclear magnetic resonance spectroscopy, mass analysis, cyclic voltammetry, transient PL decay measurements, and OLED device fabrication and measurements.
4：Experimental Procedures and Operational Workflow:
Synthesis of TADF emitters, characterization of their photophysical properties, fabrication of OLED devices, and evaluation of device performance.
5：Data Analysis Methods:
Analysis of photophysical properties, device performance metrics (EQE, lifetime), and comparison with state-of-the-art TADF emitters.
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