The effect of spin-polarized injection in polymer light emitting diode

• Main Authors: Cheng-lun Tsai, 蔡承倫
• Other Authors: Jung-Chun Andrew Huang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/28714752994421080656

碩士 === 國立成功大學 === 物理學系碩博士班 === 97 === In this thesis,the major job is to explore the effect of spin-polarized injection in polymer light emitting diode.We indirectly observe a hole spin-polarized injection from the ferromagnetic anode through the experimental measurement and the theoretical hypothesis.At first, in order to know what contribute the magnetic effect,we manufacture a common light-emitting diode device,using PFO (polyfluorene) material to be the active layer,PEDOT:PSS and Ca(cathcium) as the hole- and electron- injecting layer,respectively. Furthermore,from the electric and magnetic measurement,we can get some information that those particles and excitons how to transport in the materials or interact with each other.However,by an another way we replace the PEDOT:PSS with permallory or cobalt to polarize the hole’s spin and then inject to the lighting active layer to change the pairing mechanism,we will observe an enhanced magneto-response.Therefore, it is helpful to explain the mechanism of excited states from those experimental results.Finally,we believe this study is useful for the future work,and we expect the spin-polarizd research will be contributed to the practical application in future.