Synthetic And Optical Study Of 1,2-dihydrophosphete Derivatives

The introduction of phosphorus into the study of organic light emitting diodes is an important approach. The researches into phosphole and phosphorus containing compounds alike have already produced compound with good optoelectrical qualities even light emitting devices. In this thesis, we followed the theme of OLED, concentrating on one particular core structure-1,2-dihydrophosphete. The current trends in phosphorus containing organic light emitting compounds and structures mainly concerned the core structure of phosphole, a five member ring structure. In this study, we shift this focus to the four member ring structures 1,2-dihydrophosphete.Referencing the work of Majoral, we constructed our 1,2-dihydrophosphete skeleton through zirconium mediated C-C bond formation.With this method, we synthesized a series of 1,2-dihydrophosphete derivatives.Through UV-Vis and fluorescence spectroscopy, we studied the optical qualities of the prepared compounds. We found:first, the direct modification of the P lone pair has little influence on the absorption and emission characteristics of the structure. However, this modification can inluence the fluorescent yield of the structure significantly, as P oxide derivative has the highest emission efficiency. Second, the peripheral functional groups on the backbone have their effects on the absorption and emission characteristics of the structure, i.e. the charge transfer effect where a electron donating group in present in the periphery leads to the red shift of both the absorption and emission peaks. Last, we found that the larger scale of the conjugation backbone leads to the red shift of both the absorption and emission peaks.