| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系研究所 === 97 === This thesis research is to study the dynamical characteristics of organic/metal interface in organic light-emitting devices (OLED) by means of measuring P-polarized He-Ne laser reflectivity spectra in which surface plasmon resonance (SPR) sensitive to interfacial properties can be generated as incident laser satisfies specific condition. Due to carrier injections at interfaces, it’s been confirmed that there is an intermediate layer between organic and metal layers in OLED during device operation. The dynamical properties of organic/metal interface can be characterized by optical constants of this intermediate layer as our experimental data fit to multi-layer OLED optical models with 3 or 4 adjustable variables. Our experimental results showed that the optical constants (n, k) and thickness (d) are (8.73, 6.98) and 14.05nm respectively in best fit with 3 variables. The fitting tolerance can reach 2.5E-3. The optical constants (n, k) and thickness (d) are (1.74, 5.96) and 9.19nm respectively in best fit with 4 variables. The fitting tolerance can reach 2.76E-5. It also revealed that the characteristic of this intermediate layer is similar to metal due to its high reflection and high absorption. The optical constants increased in range of 0.02-0.3 during device operation as driving voltage increased.
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