Low temperature synthesis and photoluminescence properties of ZnO quantum dots
ZnO quantum dots (QDs) were fabricated at low temperature of 200℃ through thermal decomposition method with the introduction of sodium dodecyl sulfate (SDS). The morphology, structure and optical properties were investigated by the methods of X-ray diffraction (XRD), transmission electron microscope (TEM), photoluminescence (PL) and Raman spectrum respectively. The XRD results showed the as-synthesized ZnO QDs had hexagonal wurzite structure and the average grain size estimated from Scherrer formula was 5.5nm which had a good agreement with TEM result. And it is evident that the introduction of SDS can actually decrease the grain size to form ZnO QDs. The Raman results also indicated that the ZnO QDs keep the overall crystal structure of the bulk ZnO. Both spatial confinement within the dot boundaries and phonon localization by defects are the mainly reason for the only few cm.1 redshift of the Raman scatter peaks. The room-temperature photoluminescence reveals that the as-prepared ZnO QDs exhibit an ultraviolet emission at 380nm and a broad low energy defectrelated emission in the range of 420～600 nm in wavelength, which testified the Raman and XRD results that the as-synthesized ZnO QDs had more defects. Moreover, the growth mechanism of ZnO QDs was also discussed in the article.
ZnO quantum dots Photoluminescence Raman
杨丽丽 杨景海 刘小燕 张永军 王雅新 范厚刚 王丹丹 郎集会
长春光学精密仪器与物理研究所激发态过程重点实验室,中国科学院,长春,130033,中国;中国科学院研究生院,北京,100049,中国;吉林师范大学凝聚态物理研究所,四平,136000,中国 长春光学精密仪器与物理研究所激发态过程重点实验室,中国科学院,长春,130033,中国;吉林师范大学凝聚态物理研究所,四平,136000,中国 吉林师范大学凝聚态物理研究所,四平,136000,中国
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）