研究目的
Investigating the non-radiative decay mechanism in heteroleptic Ir-based triplet emitters for OLED devices and formulating a strategy to improve electroluminescence efficiency by designing ancillary ligands.
研究成果
Functionalizing the ancillary ligand in a heteroleptic triplet emitter is a viable strategy for controlling the photophysical property without impacting the photoluminescent behavior of the molecule. The improved performance is sustained in a prototype device, showing an increased outcoupling efficiency of 24%.
研究不足
The model captures only the non-radiative decay based on the internal conversion of the dopant molecule to the non-radiative T2 state, ignoring likely significant contributions from other components of the device. The accuracy of DFT-based energies may be questioned, and the model considers only one alternative triplet state.
1：Experimental Design and Method Selection:
Employed density functional theory (DFT) calculations to study the non-radiative decay mechanism and design ancillary ligands.
2：Sample Selection and Data Sources:
Used Ir(III) complexes with different ancillary ligands (acac, tmhd, dapd, dend) doped in a mixed host material for OLED devices.
3：List of Experimental Equipment and Materials:
Included thermal deposition equipment, Quantaurus-QY absolute PL quantum yield spectrometer, time-correlated single photon counting setup, and OLED fabrication materials.
4：Experimental Procedures and Operational Workflow:
Fabricated OLED devices, measured photoluminescence spectra, PL quantum yield, time-resolved PL characteristics, and device performance.
5：Data Analysis Methods:
Analyzed DFT calculations, PL spectra, quantum yields, and device efficiencies to evaluate the impact of ancillary ligands on non-radiative decay rates.
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