期刊
NANOTECHNOLOGY
卷 25, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/7/075601
关键词
zinc oxide; nanoparticle; photoluminescence; electroluminescence; LED
资金
- State Fund for Fundamental Research of Ukraine [Phi53.3/019]
- State Program 'Development of energy-saving light-emitting devices and related lighting systems' [1.2.4.2]
- Presidium of National Academy of Sciences of Ukraine (Project of NASU) [07-03-12 Ukr]
- Presidium of National Academy of Sciences of Ukraine (Project of the Siberian Branch of the Russian Academy of Sciences) [07-03-12 Ukr]
- Alexander von Humboldt Foundation
Stable colloidal solutions of zinc oxide in dimethylsulfoxide were synthesized via interaction between zinc(II) acetate and tetraalkylammonium hydroxides (alkyl-ethyl, propyl, butyl, and pentyl). Colloids of ZnO emit photoluminescence in a broad band with a maximum at 2.3-2.4 eV with quantum yields of up to 9-10% at room temperature and 15-16% at 80 K. The photoluminescence is supposed to originate from the radiative recombination of conduction band electrons with holes captured by deep traps having corresponding states in the band gap 1.0-1.2 eV above the valence band edge. The size of colloidal ZnO nanocrystals depends on the duration and temperature of the post-synthesis treatment and varies in the range of 3-6 nm. Growth of the ZnO nanocrystals can be terminated at any moment of the thermal treatment by freezing the colloidal solution or by addition of tetraethyl orthosilicate which hydrolyses forming core-shell ZnO@SiO2 particles. ZnO nanocrystals introduced into polyethyleneimine films can be used as an active component of an LED emitting at an applied voltage higher than 13 V.
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