Band gap variation of size-controlled ZnO quantum dots synthesized by sol-gel me

2019-09-16 20:52:23

size quantum DOTS dependent Hsu

责任者: Lin, Kuo-Feng;Cheng, Hsin-Ming;Hsu, Hsu-Cheng;Lin, Li-Jiaun;Hsieh, Wen-Feng 单位: Department of Photonics, Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan 来源出处: Chemical Physics Letters,2005,409(4-6):208-211 摘要: ZnO quantum dots were synthesized successfully via a simple sol-gel method. The average size of quantum dots can be tailored using well-controlled concentration of zinc precursor. Size-dependent blue shifts of photoluminescence and absorption spectra revealed the quantum confinement effect. The band gap enlargement is in agreement with the theoretical calculation based on the effective mass model. Furthermore, as the particle size decreases, we observed an increase in the size-dependent Stokes shift of the photoluminescence peak relative to the absorption onset. © 2005 Elsevier B.V. All rights reserved. 关键词: Semiconductor quantum dots;Zinc oxide;Synthesis (chemical);Sol-gels;Nanostructured materials;Photoluminescence;Excitons;Absorption spectroscopy;Semiconductor lasers;Piezoelectric transducers;X ray diffraction;Diffractometers;Spectrophotometers;Photomultipliers;Viscosity;Quantum confinement effects;Size-dependent Stokes shift;Optical transitions;Conduction levels