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Author Ovchinnikov, O. V. ♦ Smirnov, M. S. ♦ Latyshev, A. N. ♦ Leonova, L. Yu ♦ Kosyakova, E. A. ♦ Klyuev, V. G. ♦ Tat'yanina, E. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword NANOSCIENCE AND NANOTECHNOLOGY ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ABSORPTION ♦ CONVERSION ♦ CRYSTALS ♦ DYES ♦ ELECTRONS ♦ EV RANGE ♦ EXCITATION ♦ HOLES ♦ LUMINESCENCE ♦ MOLECULES ♦ NANOSTRUCTURES ♦ ORGANOMETALLIC COMPOUNDS ♦ PHOTOIONIZATION ♦ PHOTONS ♦ RECOMBINATION ♦ SILVER ♦ SURFACES ♦ VALENCE ♦ BOSONS ♦ ELEMENTARY PARTICLES ♦ ELEMENTS ♦ EMISSION ♦ ENERGY RANGE ♦ ENERGY-LEVEL TRANSITIONS ♦ FERMIONS ♦ IONIZATION ♦ LEPTONS ♦ MASSLESS PARTICLES ♦ METALS ♦ ORGANIC COMPOUNDS ♦ PHOTON EMISSION ♦ SORPTION ♦ TRANSITION ELEMENTS
Abstract We demonstrate the feasibility of low-threshold (10{sup -4} to 10{sup -2} W cm{sup -2}) anti-Stokes conversion of photons in the range 1.72 - 2.00 eV to luminescence at 2.14 - 2.38eV at temperatures from 77 to 300 K in Zn{sub 0.6}Cd{sub 0.4}S crystals with nanoscale complexes of dye molecules and silver subnanoclusters adsorbed on their surface. The spectral characteristics of the centres involved in anti-Stokes frequency conversion indicate that this process in the crystals studied is due to sequential two-photon interband optical transitions. The absorption of a photon by a dye molecule and electron excitation transfer to an adsorbed silver subnanocluster produce a free hole in the valence band. Subsequent photoionisation of the subnanocluster produces a free electron. The last step of the anti-Stokes frequency conversion process is radiative recombination of the electron with a hole localised at an emission centre. (nonlinear-optics phenomena)
ISSN 10637818
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-08-27
Publisher Place United States
Journal Quantum Electronics
Volume Number 40
Issue Number 6


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