Department of Physics, National Institute of Technology, Tiruchirappalli 620 015, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Nov;82(1):97-101. doi: 10.1016/j.saa.2011.07.005. Epub 2011 Jul 8.
Optical properties of Ca doped ZnO nanoparticles prepared at room temperature through wet chemical method have been investigated. X-ray diffraction studies show that particles are crystalline in nature and doping did not induce impurity phases. Optical absorption measurements show an absorption peak at ∼372 nm which is due to excitonic absorption of the ZnO. Photoluminescence studies reveal a broad emission at an excitation wavelength of 335 nm and the bands are attributed to near band edge emission, oxygen vacancies, surface dangling bonds and zinc interstitials. Incorporating Ca(2+) induces reduction in near band edge emission and there is an enhancement in the oxygen vacancy peaks which are attributed to the shape changes in the nanoparticles.
通过室温下的湿化学法制备的掺钙 ZnO 纳米粒子的光学性质进行了研究。X 射线衍射研究表明，颗粒具有晶态性质，掺杂没有诱导杂质相。光学吸收测量显示在 ∼372nm 处有一个吸收峰，这归因于 ZnO 的激子吸收。光致发光研究表明，在 335nm 的激发波长下有一个宽发射带，这些带归因于近带边发射、氧空位、表面悬挂键和锌间隙。掺入 Ca(2+) 会导致近带边发射减少，而氧空位峰增强，这归因于纳米颗粒的形状变化。
