This course focuses on optoelectronic measurement and material characterization techniques, exploring their applications in organic semiconductors and sustainable materials. Using UV-Vis spectrophotometry and photoluminescence (PL) spectroscopy, we analyzed the absorption and emission properties of organic semiconductor materials to assess their potential in light-emitting devices and photovoltaic applications. Transient photoluminescence spectroscopy (TRPL) was employed to measure excited-state lifetimes, providing insights into energy transfer mechanisms to enhance optoelectronic conversion efficiency. In electrochemical analysis, cyclic voltammetry (CV) was used to examine the redox behavior of materials, estimating the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels, which are crucial for designing high-performance organic electronic devices. Additionally, photoluminescence quantum yield (PLQY) measurements were conducted to evaluate the intrinsic emission efficiency of materials, optimizing their performance in light-emitting applications. Thermal property measurements, including thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), were used to assess material stability and phase transition behavior, ensuring their durability and recyclability. Furthermore, the sublimation system enhanced the purity of organic semiconductor materials while reducing the use of organic solvents, minimizing environmental impact. The findings from this course demonstrate that integrating optoelectronic measurement and material characterization techniques effectively improves the feasibility of organic semiconductor materials in sustainable optoelectronic devices and green energy technologies, contributing to the advancement of circular economy practices for sustainable technology.