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Volume : I, Issue : V, June - 2011 COMPARATIVE STUDY OF PHOTOLUMINESCENCE IN DOPED AND UNDOPED LEAD IODIDE CRYSTALS D.S.BHAVSAR Published By : Laxmi Book Publication Abstract : A Lead Iodide is a layered semiconductor having the direct band gap 2.55eV with
space group D3d. They consists of molecular sheets, each consisting of a layer
cation sandwiched between two layers of hexagonal close packed anion. The
forces within a sandwiched are purely ionic in nature, giving a strong binding
between an anion and cation layer, whereas the anion layer in adjacent sandwiches
are held together by weak van der Waal’s forces of attraction. The layers can be
stacked in a variety of ways to form different types of polyptism. The most
common structure is the 2H hexagonal structure. The band edge optical properties
of single crystals have been studied extensively for about 3 decades. I.Ch. Schluter
and M. Schluter [1] have reported that the exitonic absorption at the fundamental
band edge is cationic with the conduction band states arising predominantly from
Pb, 6P atomic orbital, while the valence band states arise from Pb, 6S orbitals. R.
Kleim and F. Raga [2], F. Levy et. al.[3] have investigated on luminescence
properties at low temperature. M.S. Skolnick and D. Bimberg [4] have reported
that in the emission spectrum of lead iodide, recombination of free exitons bound
to neutral donars. Besides these, there often appears a band emission in the lower
region. Kleim and Raga [2], Bunskil et. al. [5] has reported that the luminescence
of Lead Iodide samples prepared by clearing zone-refined crystals consists of a
complex emission band. Keywords : Article : Cite This Article : D.S.BHAVSAR, (2011). COMPARATIVE STUDY OF PHOTOLUMINESCENCE IN DOPED AND UNDOPED LEAD IODIDE CRYSTALS. Indian Streams Research Journal, Vol. I, Issue. V, http://oldisrj.lbp.world/UploadedData/295.pdf References : - I.Ch. Xchluter and M. Schluter, Phys. Rev. B9 (1974)16 52
- R. Kleim and F. Raga, J. Phys. Chem. Solids 30 (1969) 2213
- F. Levy, A. Mercuer and J.P. Voit Chovsky, Solid State Commun.15 )1974) 819
- M.S. Skelnicd and D. Bomberg Physical Review B 18 (1978)
- I.V. Blonskii, I.S. Gorban, V.A. Gubaoer, Ya.A. Lyuter, L.V. Poperenke and M.I. Slreshnilekeva, Sov. Phys. Solid State 15 (1974) 2439
- I. Baltog, I.Piticu, M. Constantinescu, C. Ghita and L.Chita, Phys.Stat. Solu. (a) 52 103 (1979)
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