摘要
用激光化学气相沉积法制备出平均粒径为10nm的 a-Si_3N_4纳米粒子,对不同浓度的 a-Si_3N_4纳米粒子溶液进行了紫外吸收及荧光光谱测试,并首次在3.0~4.1 eV范围发现6个荧光峰.根据吸收及荧光光谱研究其能级结构,描述了a-Si_3N_4纳米粒子的物理结构图像,验证了硅悬挂键Si~O在a-Si_3N_4纳米粒子光谱性质中的主导作用.
Namometer sized a-Si_3N_4 particles of 10 nm in average diameter were obtained by Laser induced Chemical Vapor Deposition (LICVD). The spectra of UV absorption and fluorescence of a-Si_3N_4 particles in different colloids were measured. Six fluorescent peaks from 3.0 eV to 4.1 eV were found for the first time. According to the absorption and fluorescence spectra of the particles, we studied their energy level structure. We also demonstrated that silicon dangling bond Si^0 plays a dominant role in the spectrum character for nanometer a-Si_3N_4 particles.
出处
《量子电子学报》
CAS
CSCD
2000年第2期185-188,共4页
Chinese Journal of Quantum Electronics