Ramya Emusani, Rao M Veeramohan, Jyothi L, Rao D Narayana
J Nanosci Nanotechnol. 2018 Oct 1;18(10):7072-7077. doi: 10.1166/jnn.2018.15521.
ZnO nanoparticles doped with transition metal (Ag, Ni, Mn) were prepared by using co-precipitation method. Absorption spectra showed exciton peak for ZnO nanoparticles at 367 nm and for Ag, Ni, Mn doped ZnO nanoparticles at 328, 354 nm and 342 nm respectively. Photoluminescence dynamics showed shallow level-trap and deep-level emission where the intensity of deep-level trap increases with transition metal doping due to the oxygen deficiency. Nonlinear absorption measurements showed the two-photon absorption increasing with transition metal following the trend Ag > Ni > Mn when excited with 532 nm, 30 ps laser pulses. The transition metal doped and un-doped ZnO nanoparticles can be used as optical limiters.
采用共沉淀法制备了掺杂过渡金属（银、镍、锰）的氧化锌纳米颗粒。吸收光谱显示，氧化锌纳米颗粒的激子峰位于367nm处，而银、镍、锰掺杂的氧化锌纳米颗粒的激子峰分别位于328nm、354nm和342nm处。光致发光动力学显示出浅能级陷阱和深能级发射，其中由于氧缺陷，深能级陷阱的强度随过渡金属掺杂而增加。非线性吸收测量表明，当用532nm、30ps激光脉冲激发时，双光子吸收随过渡金属的增加而增加，其趋势为银>镍>锰。掺杂和未掺杂过渡金属的氧化锌纳米颗粒均可用作光限幅器。
