Nanoparticles of lead iodide (PbI2) were prepared by exposure of Langmuir-B
lodgett (LB) films of lead arachidate to hydrogen iodide. The photoluminesc
ence (PL) spectrum of the nanoparticles consisted of three bands: an excito
n band and two low-energy bands associated with stoichiometric and structur
al defects. The center of the exciton band was blue-shifted due to a quantu
m size effect. The PL spectra drastically changed when the temperature incr
eased.