Lasing properties of TiO2/ZnO nanocomposites

• Main Authors: Cih-Su Wang, 王慈甦
• Other Authors: Yang-Fang Chen
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/93662725864747811756

碩士 === 國立臺灣大學 === 應用物理所 === 99 === An improvement in random lasing action at ultraviolet wavelength has beenachieved from ZnO nanorod arrays grown on sapphire substrate with the assistance of TiO2 nanoparticles. Due to the inherent nature of high refractive index of TiO2 (n ~2.5)> ZnO(n~1.9), the TiO2 nanoparticles can serve efficiently as excellent nanoscatterers,which can promote the formation of closed-loop paths. In addition, the underlying origin of the pronounced lasing action can also be attributed to the enhanced emission arising from fluorescence resonance energy transfer (FRET) between the band edge transition of ZnO nanorods and TiO2 nanoparticles. The strategy of the lasing enhancement provided here should be very useful for the future development in designing high efficiency optoelectronic devices.