Abstract
Nanometer-sized particles of lead iodide layered semiconductors were embedded in SiO 2 films. X-ray diffraction and photoluminescence (PL) spectroscopy showed the preservation of the bulk layered structure and symmetry. The PL and PL excitation (PLE) spectroscopy exhibited a blue-shift due to quantum size effect. The bulk lead iodide showed exciton transition with an exceptionally small Bohr radius (a B =19 A) and a large Rydberg constant (R=70.8 meV). In addition, the lead iodide represents a special case in which m e m h
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