研究目的
Investigating the development of high-efficiency and low-cost fluorescent organic light-emitting diodes (OLEDs) in the deep-red (DR)/near-infrared (NIR) region.
研究成果
The study successfully developed three D-A-D′ type DR emitters, with PIBz-3-PTZ showing the best performance due to its planar molecular configuration and larger conjugation length. The nondoped device based on PIBz-3-PTZ achieved a maximum EQE of 2.02% with an emission peak at 672 nm, demonstrating the potential for high-efficiency NIR-emission fluorophores in commercial applications.
研究不足
The study focuses on the development of DR/NIR fluorescent OLEDs with high efficiency and low efficiency roll-off, but the practical applications may be limited by the current maximum EQE of 2.02% and the need for further optimization to compete with blue and green emitters.
1：Experimental Design and Method Selection
Three novel donor-acceptor-donor′ (D-A-D′) fluorophores were synthesized utilizing phenanthro[9,10-d]imidazole and phenothiazine as the donor, benzothiadiazole as the acceptor.
2：Sample Selection and Data Sources
Samples were synthesized through Suzuki and Ullmann coupling reactions. The purity and chemical structures were confirmed by NMR, mass spectrum, and elemental analysis.
3：List of Experimental Equipment and Materials
Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) methods under N2 atmosphere, cyclic voltammetry (CV) measurements, density functional theory (DFT) calculations.
4：Experimental Procedures and Operational Workflow
The thermal properties were investigated using TGA and DSC. Electrochemical properties were carried out via CV measurements. Theoretical calculations were performed using the Gaussian 09 program.
5：Data Analysis Methods
The radiative rate (kr) and nonradiative rate (Knr) were calculated from the ΦPL value based on the given equations.
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