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Cadmium‐Alloyed Zinc Oxide Nanocrystals in the Quantum Confinement Region with Intense Visible Luminescence
Author(s) -
Yang Yuetao,
Liu Xiaojun
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800031
Subject(s) - wurtzite crystal structure , crystallite , luminescence , materials science , quantum dot , zinc , raman spectroscopy , transmission electron microscopy , nanocrystal , photoluminescence , cadmium oxide , band gap , analytical chemistry (journal) , potential well , cadmium , nanotechnology , chemistry , optoelectronics , optics , metallurgy , physics , chromatography
Via an ultrasonic assisted sol‐gel method, cadmium‐alloyed zinc oxide nanocrystals in the quantum confinement region are firstly prepared. The nanocrystals show a wurtzite structure over all compositions. The homogenous structures of the samples are confirmed by transmission electron microscopy, X‐ray diffraction, infrared and Raman analyses. With the increase of Cd/Zn mole ratio from 0 to 2.0, the band gap values of the samples first shift red then shift blue, and shift red again. The variation of band gap values for the samples is explained based on the compositions and crystallite sizes. The samples exhibit intense visible luminescence. The maximum of the visible luminescence systematically shifts to the lower wavelength with the decrease of the crystallite size. It is found that both the ultrasonic treatment and the coordination ability of triethylene glycol play important roles in the current sol‐gel preparation.