Brighter glow in ZnS nanocrystals with polarized light |
| |
Authors: | Santa Chawla N KararHarish Chander |
| |
Institution: | National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India |
| |
Abstract: | No known reports exist on luminescence enhancement under polarized light excitation. In this study, ZnS nanocrystals have been observed to produce brighter luminescence when excited by polarized light. ZnS:Mn bulk and nanocrystals have shown fivefold to tenfold increase in photoluminescence (PL) intensity when excited with linearly polarized light at 305 nm and 340 nm. Luminescence enhancement to a lesser degree was observed with linearly polarized light excitation for ZnS:Cu, Al and ZnS:Ag, Al nanocrystals. The observations suggest emission intensity dependence on the degree of anisotropy, which could be correlated mainly with the symmetry of the luminescence center and also to a lesser extent with nanoparticle shape asymmetry. |
| |
Keywords: | Optical properties of nanocrystals Photoluminescence Polarized light Luminescence enhancement |
本文献已被 ScienceDirect 等数据库收录! |