DESIGN AND SYNTHESIS OF RARE EARTH METAL COMPLEXES FOR ORGANIC WHITE LIGHT EMITTING DIODE APPLICATIONS

Date

2025-6-20

Author

Maraşlıoğlu, Cem

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Organic light-emitting diodes (OLEDs) provide flexible screens and bright colors. Thus, among them, white OLEDs (WOLEDs) are the most widely utilized due to the high demand for white light. The newest researches have been on single-molecule emissive layers containing WOLED devices, offering ease and consistency in fabrication. In this thesis, 8 emissive rare earth metal-containing complexes were designed and synthesized to be used in WOLED devices as which offer multicomponent emission from the ligand and the metals, Terbium (Tb) and Europium (Eu). Their structural characterizations are done by infrared spectroscopy (IR) and supported by electronic structure characterizations of the atoms on small molecules, done by X-ray photoelectron spectroscopy (XPS) analyses. Their optical band gaps are found from UV-Vis analyses and followed by the highest occupied molecular orbital (HOMO) energy levels determined from p-dopping curves of cyclic voltammograms. After that, by assuming the optical band gap is equal to the electrochemical band gap, lowest unoccupied molecular orbital (LUMO) energy levels were also noted. The optical band gaps, HOMO and LUMO values were populated around 3.10 eV, -5.95 eV and -2.85 eV, respectively. The thermal characterizations were done by thermal gravimetric analyses (TGAs) and the WOLED device was constructed with ITO/HAT-CN (6 nm)/TAPC (60 nm)/EML (30 nm)/TPBi (50 nm)/LiF/Al (100 nm) device architecture. Upon all the characterizations, the complex denoted as Tb-(L2)3 was the EML of a WOLED device with a turn-on voltage of 2.94 V, maximum luminance of 12159 cd.m-2 and EQE% of 0.65%.

Subject Keywords

Rare earth metal, WOLEDs, multicomponent emission, ligand, complex

URI

https://hdl.handle.net/11511/115175

Collections

Graduate School of Natural and Applied Sciences, Thesis