Structural and photophysical properties of pure and mixed evaporated merocyanine layers

✍ Scribed by H. Böttcher; O. Hertz; M.A. Fox

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 642 KB
• Volume: 158
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)87370-1

✦ Synopsis

By absorption and fluorescence measurements (steady-state and time-resolved), the aggregation behavior of pure evaporated merocyanine layers was analyzed and compared with that observed when the dye is evaporated with inorganic admixtures (metal halides, TiO>). While in pure merocyanine layers, both emissive and non-emissive aggregates can be observed, increasing admixture with NaF produces mixed layers with reduced aggregate size and concentration. Mixed layers with only 2% dye in NaF exhibit mainly a molecular distribution of the dye within the matrix. Mixed layers (1: 1) with different inorganic compounds contain different aggregation ratios, depending on the lattice structure and the polarity ofthe admixture. The degree of aggregation in turn determines the absorption and emission behavior. Whereas mixed dye: PbClz layers show strong fluorescence. the admixture of dye with PbBr, or Pbi2 quenches the dye fluorescence.