Abstract
Epitaxially oriented nanocrystals of phosphorescent platinum tetraphenylporphyrin (PtTPP) were grown by vapor deposition on a cleaved surface of alkali halide single-crystals. PtTPP deposited on the KCl (0 0 1) surface kept at 200 °C formed pyramidal crystals showing red phosphorescence. In these crystals the PtTPP molecules are packed in a body-centered tetragonal cell and lie parallel to the KCl surface taking the √10×√10 epitaxy. On the other hand, PtTPP deposited on the KBr (0 0 1) surface kept at 200 °C formed plate-like crystals in which the molecular planes were standing. The monoclinic molecular packing in the crystals on KBr resulted in phosphorescence quenching. Their orientation-dependent phosphorescence properties were discussed in terms of the triplet–triplet annihilation in the epitaxial crystals.
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